{"id":114895,"date":"2022-03-18T13:19:21","date_gmt":"2022-03-18T12:19:21","guid":{"rendered":"https:\/\/material-properties.org\/carburant-diesel-densite-point-de-fusion-conductivite-thermique\/"},"modified":"2022-03-18T13:19:21","modified_gmt":"2022-03-18T12:19:21","slug":"carburant-diesel-densite-point-de-fusion-conductivite-thermique","status":"publish","type":"post","link":"https:\/\/material-properties.org\/fr\/carburant-diesel-densite-point-de-fusion-conductivite-thermique\/","title":{"rendered":"Carburant diesel &#8211; Densit\u00e9 &#8211; Point de fusion &#8211; Conductivit\u00e9 thermique"},"content":{"rendered":"<h2><span style=\"\">\u00c0 propos du carburant diesel<\/span><\/h2>\n<p><span style=\"\">En g\u00e9n\u00e9ral, le carburant diesel est tout carburant liquide sp\u00e9cifiquement con\u00e7u pour \u00eatre utilis\u00e9 dans les moteurs diesel, dont l&rsquo;allumage du carburant a lieu, sans aucune \u00e9tincelle, \u00e0 la suite de la compression du m\u00e9lange d&rsquo;air d&rsquo;admission puis de l&rsquo;injection de carburant.&nbsp;Actuellement, la principale source de carburant pour les v\u00e9hicules routiers est l&rsquo;huile de p\u00e9trole.&nbsp;Le p\u00e9trole est un liquide fossile naturel compos\u00e9 d&rsquo;un m\u00e9lange complexe d&rsquo;hydrocarbures de divers poids mol\u00e9culaires et de divers autres compos\u00e9s organiques.&nbsp;Ces composants sont s\u00e9par\u00e9s par distillation fractionn\u00e9e dans une raffinerie de p\u00e9trole afin de produire de l&rsquo;essence, du carburant diesel, du k\u00e9ros\u00e8ne et d&rsquo;autres produits.&nbsp;<div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div><\/span><\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/diesel-fuel-properties-density-strength-price.png\" data-mce-href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/diesel-fuel-properties-density-strength-price.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108319\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/diesel-fuel-properties-density-strength-price.png\" alt=\"carburant diesel propri\u00e9t\u00e9s densit\u00e9 r\u00e9sistance prix\" width=\"500\" height=\"500\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/diesel-fuel-properties-density-strength-price.png\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/diesel-fuel-properties-density-strength-price.png 1000w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/diesel-fuel-properties-density-strength-price-300x300.png 300w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/diesel-fuel-properties-density-strength-price-150x150.png 150w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/03\/diesel-fuel-properties-density-strength-price-768x768.png 768w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p><span style=\"\"><div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div><\/span><\/p>\n<h3 style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Sommaire<\/span><\/h3>\n<table class=\"a mce-item-table\">\n<tbody>\n<tr class=\"b\">\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Nom<\/span><\/td>\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><strong>Carburant Diesel<\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Phase \u00e0 STP<\/span><\/td>\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><strong><span style=\"\">liquide<\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Densit\u00e9<\/span><\/td>\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><strong><span style=\"\">850kg\/m3<\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">R\u00e9sistance \u00e0 la traction ultime<\/span><\/td>\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><strong><span style=\"\">N \/ A<\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Limite d&rsquo;\u00e9lasticit\u00e9<\/span><\/td>\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><strong><span style=\"\">N \/ A<\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Module de Young<\/span><\/td>\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><strong><span style=\"\">N \/ A<\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Duret\u00e9 Brinell<\/span><\/td>\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><strong><span style=\"\">N \/ A<\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Point de fusion<\/span><\/td>\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><strong><span style=\"\">N \/ A<\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Conductivit\u00e9 thermique<\/span><\/td>\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><strong><span style=\"\">0,13 W\/mK<\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Capacit\u00e9 thermique<\/span><\/td>\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><strong><span style=\"text-align: start;\" data-mce-style=\"text-align: start;\"><span style=\"\">2100 J\/g\u00b7K<\/span><\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"c\">\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Prix<\/span><\/td>\n<td style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><strong><span style=\"\">1,1&nbsp;$\/kg<\/span><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"\"><div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div><\/span><\/p>\n<h2><span style=\"\">Densit\u00e9 du carburant diesel<\/span><\/h2>\n<p class=\"wp-caption-text\"><span style=\"\">Les densit\u00e9s typiques de diverses substances sont \u00e0 la pression atmosph\u00e9rique.&nbsp;<\/span><a href=\"https:\/\/material-properties.org\/what-is-density-physics-definition\/\" data-mce-href=\"https:\/\/material-properties.org\/what-is-density-physics-definition\/\"><strong><span style=\"\">La densit\u00e9<\/span><\/strong><\/a><span style=\"\"> est d\u00e9finie comme la <\/span><strong><span style=\"\">masse par unit\u00e9 de volume<\/span><\/strong><span style=\"\">.&nbsp;C&rsquo;est une <\/span><strong><span style=\"\">propri\u00e9t\u00e9 intensive<\/span><\/strong><span style=\"\">, qui est d\u00e9finie math\u00e9matiquement comme la masse divis\u00e9e par le volume: <\/span><strong><span style=\"\">\u03c1 = m\/V<\/span><\/strong><\/p>\n<p><span style=\"\">En d&rsquo;autres termes, la densit\u00e9 (\u03c1) d&rsquo;une substance est la masse totale (m) de cette substance divis\u00e9e par le volume total (V) occup\u00e9 par cette substance.&nbsp;L&rsquo;unit\u00e9 SI standard est <\/span><strong><span style=\"\">le kilogramme par m\u00e8tre cube<\/span><\/strong><span style=\"\"> (<\/span><strong><span style=\"\">kg\/m<\/span><sup><span style=\"\">3<\/span><\/sup><\/strong><span style=\"\">).&nbsp;L&rsquo;unit\u00e9 anglaise standard est <\/span><strong><span style=\"\">la masse de livres par pied cube<\/span><\/strong><span style=\"\"> (<\/span><strong><span style=\"\">lbm\/ft<\/span><sup><span style=\"\">3<\/span><\/sup><\/strong><span style=\"\">).<\/span><\/p>\n<p><span style=\"\">La densit\u00e9 du carburant diesel est de&nbsp;<\/span><strong><span style=\"\">850 kg\/m<\/span><sup><span style=\"\">3<\/span><\/sup><span style=\"\">.<\/span><\/strong><\/p>\n<h3><span style=\"\">Exemple: Densit\u00e9<\/span><\/h3>\n<p><span style=\"\">Calculez la hauteur d&rsquo;un cube de carburant diesel, qui p\u00e8se une tonne m\u00e9trique.<\/span><\/p>\n<p><strong><span style=\"\">Solution:<\/span><\/strong><\/p>\n<p><strong><span style=\"\">La densit\u00e9<\/span><\/strong><span style=\"\"> est d\u00e9finie comme la <\/span><strong><span style=\"\">masse par unit\u00e9 de volume<\/span><\/strong><span style=\"\">.&nbsp;Il est math\u00e9matiquement d\u00e9fini comme la masse divis\u00e9e par le volume: <\/span><strong><span style=\"\">\u03c1 = m\/V<\/span><\/strong><\/p>\n<p><span style=\"\">Comme le volume d&rsquo;un cube est la troisi\u00e8me puissance de ses c\u00f4t\u00e9s (V = a<\/span><sup><span style=\"\">3<\/span><\/sup><span style=\"\">), la hauteur de ce cube peut \u00eatre calcul\u00e9e:<\/span><\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/density-equation.png\" data-mce-href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/density-equation.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-109277 size-full\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/density-equation.png\" alt=\"densit\u00e9 du mat\u00e9riau - \u00e9quation\" width=\"281\" height=\"125\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/density-equation.png\"><\/a><\/p>\n<p><span style=\"\">La hauteur de ce cube est alors&nbsp;<\/span><strong><span style=\"\">a = 1,056 m<\/span><\/strong><span style=\"\">.<\/span><\/p>\n<p><span style=\"\"><div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<p><span style=\"\"><\/span><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Densit\u00e9 des mat\u00e9riaux<\/span><\/h3>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-108113 size-medium aligncenter\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-300x179.png\" alt=\"Tableau des mat\u00e9riaux - Densit\u00e9 des mat\u00e9riaux\" width=\"300\" height=\"179\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-300x179.png\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-300x179.png 300w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-1024x610.png 1024w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density-768x458.png 768w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Density.png 1368w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><span style=\"\"><\/span><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<p><span style=\"\"><\/span><\/p><\/div><\/div> <div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div><\/span><\/p>\n<h2><span style=\"\">Propri\u00e9t\u00e9s thermiques du carburant diesel<\/span><\/h2>\n<h3><span style=\"\">Carburant diesel &#8211; Point de fusion<\/span><\/h3>\n<p><strong><span style=\"\">Le point de fusion du carburant diesel est N\/A<\/span><\/strong><span style=\"\">.<\/span><\/p>\n<p><span style=\"\">Notez que ces points sont associ\u00e9s \u00e0 la pression atmosph\u00e9rique standard.&nbsp;En g\u00e9n\u00e9ral, la <\/span><strong><span style=\"\">fusion<\/span><\/strong><span style=\"\">&nbsp;est un&nbsp;<\/span><strong><span style=\"\">changement de phase<\/span><\/strong><span style=\"\"> d&rsquo;une substance de la phase solide \u00e0 la phase liquide.&nbsp;Le <\/span><strong><span style=\"\">point de fusion<\/span><\/strong><span style=\"\"> d&rsquo;une substance est la temp\u00e9rature \u00e0 laquelle ce changement de phase se produit.&nbsp;Le <\/span><strong><span style=\"\">point de fusion<\/span><\/strong><span style=\"\">&nbsp;d\u00e9finit \u00e9galement une condition dans laquelle le solide et le liquide peuvent exister en \u00e9quilibre.&nbsp;Pour divers compos\u00e9s chimiques et alliages, il est difficile de d\u00e9finir le point de fusion, car il s&rsquo;agit g\u00e9n\u00e9ralement d&rsquo;un m\u00e9lange de divers \u00e9l\u00e9ments chimiques.<\/span><\/p>\n<h3><span style=\"\">Carburant diesel &#8211; Conductivit\u00e9 thermique<\/span><\/h3>\n<p><span style=\"\">La conductivit\u00e9 thermique du carburant diesel est de&nbsp;<\/span><strong><span style=\"\">0,13&nbsp;<\/span><\/strong><strong><span style=\"\">W\/(m\u00b7K)<\/span><\/strong><span style=\"\">&nbsp;.<\/span><\/p>\n<p><span style=\"\">Les caract\u00e9ristiques de transfert de chaleur d&rsquo;un mat\u00e9riau solide sont mesur\u00e9es par une propri\u00e9t\u00e9 appel\u00e9e la <\/span><strong><span style=\"\">conductivit\u00e9 thermique<\/span><\/strong><span style=\"\">, k (ou \u03bb), mesur\u00e9e en&nbsp;<\/span><strong><span style=\"\">W\/mK<\/span><\/strong><span style=\"\">.&nbsp;C&rsquo;est une mesure de la capacit\u00e9 d&rsquo;une substance \u00e0 transf\u00e9rer de la chaleur \u00e0 travers un mat\u00e9riau par <\/span><a href=\"https:\/\/www.thermal-engineering.org\/what-is-thermal-conduction-heat-conduction-definition\/\" data-mce-href=\"https:\/\/www.thermal-engineering.org\/what-is-thermal-conduction-heat-conduction-definition\/\"><span style=\"\">conduction<\/span><\/a><span style=\"\">.&nbsp;Notez que <\/span><a href=\"https:\/\/www.thermal-engineering.org\/what-is-fouriers-law-of-thermal-conduction-definition\/\" data-mce-href=\"https:\/\/www.thermal-engineering.org\/what-is-fouriers-law-of-thermal-conduction-definition\/\"><strong><span style=\"\">la loi de Fourier<\/span><\/strong><\/a><span style=\"\"> s&rsquo;applique \u00e0 toute mati\u00e8re, quel que soit son \u00e9tat (solide, liquide ou gaz), par cons\u00e9quent, elle est \u00e9galement d\u00e9finie pour les liquides et les gaz.<\/span><\/p>\n<p><span style=\"\">La <\/span><a href=\"https:\/\/www.thermal-engineering.org\/what-is-thermal-conductivity-definition\/\" data-mce-href=\"https:\/\/www.thermal-engineering.org\/what-is-thermal-conductivity-definition\/\"><strong><span style=\"\">conductivit\u00e9 thermique<\/span><\/strong><\/a><span style=\"\"> de la plupart des liquides et des solides varie avec la temp\u00e9rature.&nbsp;Pour les vapeurs, cela d\u00e9pend aussi de la pression.&nbsp;En g\u00e9n\u00e9ral:<\/span><\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/thermal-conductivity-definition.png\" data-mce-href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/thermal-conductivity-definition.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-88791\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/thermal-conductivity-definition.png\" alt=\"conductivit\u00e9 thermique - d\u00e9finition\" width=\"225\" height=\"75\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/thermal-conductivity-definition.png\"><\/a><\/p>\n<p><span style=\"\">La plupart des mat\u00e9riaux sont presque homog\u00e8nes, nous pouvons donc g\u00e9n\u00e9ralement \u00e9crire <\/span><strong><em><span style=\"\">k = k (T)<\/span><\/em><\/strong><span style=\"\">.&nbsp;Des d\u00e9finitions similaires sont associ\u00e9es aux conductivit\u00e9s thermiques dans les directions y et z (ky, kz), mais pour un mat\u00e9riau isotrope, la conductivit\u00e9 thermique est ind\u00e9pendante de la direction de transfert, kx = ky = kz = k.<\/span><\/p>\n<h3><span style=\"\">Carburant diesel &#8211; Chaleur sp\u00e9cifique<\/span><\/h3>\n<p><strong><span style=\"\">La chaleur sp\u00e9cifique du carburant diesel est de 2100&nbsp;<\/span><\/strong><strong><span style=\"\">&nbsp;J\/g K<\/span><\/strong><span style=\"\">&nbsp;.<\/span><\/p>\n<p><strong><span style=\"\">La chaleur sp\u00e9cifique, ou capacit\u00e9 thermique sp\u00e9cifique, <\/span><\/strong><span style=\"\">est une propri\u00e9t\u00e9 li\u00e9e \u00e0&nbsp;<strong><a href=\"https:\/\/www.thermal-engineering.org\/what-is-internal-energy-thermal-energy-definition\/\" data-mce-href=\"https:\/\/www.thermal-engineering.org\/what-is-internal-energy-thermal-energy-definition\/\">l&rsquo;\u00e9nergie interne<\/a><\/strong> tr\u00e8s importante en thermodynamique.&nbsp;Les&nbsp;&nbsp;<strong>propri\u00e9t\u00e9s intensives <\/strong><strong><em>c<\/em><\/strong><strong><em><sub>v<\/sub><\/em><\/strong> et&nbsp;<strong><em>c<\/em><\/strong><strong><em><sub>p<\/sub><\/em><\/strong> sont d\u00e9finies pour des substances compressibles pures et simples comme des d\u00e9riv\u00e9es partielles de l&rsquo;&nbsp;<strong>\u00e9nergie interne&nbsp;&nbsp;<\/strong><strong><em>u(T, v)<\/em><\/strong> et de&nbsp; l&rsquo;&nbsp;<strong>enthalpie <\/strong><strong><em>h(T, p)<\/em><\/strong>, respectivement:<\/span><strong>&nbsp;<\/strong><\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/Specific-Heat-at-Constant-Volume-and-Constant-Pressure.png\" data-mce-href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/Specific-Heat-at-Constant-Volume-and-Constant-Pressure.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-87687\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/Specific-Heat-at-Constant-Volume-and-Constant-Pressure.png\" alt=\"\" width=\"106\" height=\"138\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/Specific-Heat-at-Constant-Volume-and-Constant-Pressure.png\"><\/a><\/p>\n<p><span style=\"\">o\u00f9 les indices <\/span><strong><span style=\"\">v<\/span><\/strong><span style=\"\"> et&nbsp;<\/span><strong><span style=\"\">p<\/span><\/strong><span style=\"\"> d\u00e9signent les variables maintenues fixes lors de la diff\u00e9renciation.&nbsp;Les propri\u00e9t\u00e9s <\/span><strong><span style=\"\">c<\/span><sub><span style=\"\">v<\/span><\/sub> <\/strong><span style=\"\">et <\/span><strong><span style=\"\">c<\/span><sub><span style=\"\">p<\/span><\/sub><\/strong><span style=\"\"> sont appel\u00e9es <\/span><strong><span style=\"\">chaleurs sp\u00e9cifiques <\/span><\/strong><span style=\"\">(ou&nbsp;<\/span><strong><span style=\"\">capacit\u00e9s calorifiques<\/span><\/strong><span style=\"\">) car, dans certaines conditions particuli\u00e8res, elles relient le changement de temp\u00e9rature d&rsquo;un syst\u00e8me \u00e0 la quantit\u00e9 d&rsquo;\u00e9nergie ajout\u00e9e par transfert de chaleur.&nbsp;Leurs unit\u00e9s SI sont <\/span><strong><span style=\"\">J\/kg K<\/span><\/strong><span style=\"\">ou <\/span><strong><span style=\"\">J\/mol K<\/span><\/strong><span style=\"\">.<\/span><\/p>\n<h3><span style=\"\">Exemple: Calcul du transfert de chaleur<\/span><\/h3>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Diesel-Fuel-Thermal-Conductivity.png\" data-mce-href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Diesel-Fuel-Thermal-Conductivity.png\"><img decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-109508 alignright\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Diesel-Fuel-Thermal-Conductivity.png\" alt=\"Carburant diesel - Conductivit\u00e9 thermique\" width=\"381\" height=\"660\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Diesel-Fuel-Thermal-Conductivity.png\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Diesel-Fuel-Thermal-Conductivity.png 381w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Diesel-Fuel-Thermal-Conductivity-173x300.png 173w\" sizes=\"(max-width: 381px) 100vw, 381px\" \/><\/a><span style=\"\">La conductivit\u00e9 thermique est d\u00e9finie comme la quantit\u00e9 de chaleur (en watts) transf\u00e9r\u00e9e \u00e0 travers une surface carr\u00e9e de mat\u00e9riau d&rsquo;une \u00e9paisseur donn\u00e9e (en m\u00e8tres) en raison d&rsquo;une diff\u00e9rence de temp\u00e9rature.&nbsp;Plus la conductivit\u00e9 thermique du mat\u00e9riau est faible, plus la capacit\u00e9 du mat\u00e9riau \u00e0 r\u00e9sister au transfert de chaleur est grande.<\/span><\/p>\n<p><span style=\"\">Calculer le taux de <\/span><u><span style=\"\">flux de chaleur \u00e0<\/span><\/u><span style=\"\"> &nbsp;travers un mur de 3 mx 10 m de surface (A = 30 m<\/span><sup><span style=\"\">2<\/span><\/sup><span style=\"\">). Le mur a une \u00e9paisseur de 15 cm (L<\/span><sub><span style=\"\">1<\/span><\/sub><span style=\"\">) et est constitu\u00e9 de carburant diesel avec&nbsp;<\/span><u><span style=\"\">une conductivit\u00e9 thermique<\/span><\/u><span style=\"\"> de k<\/span><sub><span style=\"\">1<\/span><\/sub><span style=\"\">&nbsp;= 0,13 W\/mK (mauvais isolant thermique).&nbsp;Supposons que les&nbsp;<\/span><u><span style=\"\">temp\u00e9ratures<\/span><\/u><span style=\"\">&nbsp;int\u00e9rieure et ext\u00e9rieure &nbsp;sont de 22\u00b0C et -8\u00b0C, et que les&nbsp;&nbsp;<\/span><u><span style=\"\">coefficients de transfert de chaleur par convection<\/span><\/u><span style=\"\"> &nbsp;sur les c\u00f4t\u00e9s int\u00e9rieur et ext\u00e9rieur sont h<\/span><sub><span style=\"\">1<\/span><\/sub><span style=\"\">&nbsp;= 10 W\/m<\/span><sup><span style=\"\">2<\/span><\/sup><span style=\"\">K et h<\/span><sub><span style=\"\">2<\/span><\/sub><span style=\"\"> = 30 W\/m<\/span><sup><span style=\"\">2<\/span><\/sup><span style=\"\">K, respectivement. A noter que ces coefficients de convection d\u00e9pendent fortement notamment des conditions ambiantes et int\u00e9rieures (vent, humidit\u00e9, etc.).<\/span><\/p>\n<p><span style=\"\">Calculez le flux de&nbsp;<\/span><strong><span style=\"\">chaleur (perte<\/span><\/strong><span style=\"\"> de chaleur) \u00e0 travers ce mur.<\/span><\/p>\n<p><strong><span style=\"\">Solution:<\/span><\/strong><\/p>\n<p><span style=\"\">Comme cela a \u00e9t\u00e9 \u00e9crit, de nombreux processus de transfert de chaleur impliquent des syst\u00e8mes composites et impliquent m\u00eame une combinaison de <\/span><u><span style=\"\">conduction<\/span><\/u><span style=\"\"> et de&nbsp;<\/span><u><span style=\"\">convection<\/span><\/u><span style=\"\">. Avec ces syst\u00e8mes composites, il est souvent pratique de travailler avec un&nbsp;<\/span><strong><u><span style=\"\">coefficient de transfert de chaleur global<\/span><\/u><\/strong><span style=\"\">,&nbsp;<\/span><strong><span style=\"\">appel\u00e9&nbsp;<\/span><\/strong><span style=\"\">&nbsp;facteur&nbsp;&nbsp;<\/span><strong><span style=\"\">U.&nbsp;<\/span><\/strong><span style=\"\">Le facteur U est d\u00e9fini par une expression analogue \u00e0 <\/span><a href=\"http:\/\/nuclear-power.com\/nuclear-engineering\/heat-transfer\/convection-convective-heat-transfer\/newtons-law-of-cooling\/\" data-mce-href=\"http:\/\/nuclear-power.com\/nuclear-engineering\/heat-transfer\/convection-convective-heat-transfer\/newtons-law-of-cooling\/\"><strong><span style=\"\">la loi de refroidissement de Newton<\/span><\/strong><\/a><span style=\"\">:<\/span><\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-Newtons-law-of-cooling.png\" data-mce-href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-Newtons-law-of-cooling.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-medium wp-image-109295\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-Newtons-law-of-cooling-300x131.png\" alt=\"Calcul du transfert de chaleur - Loi de refroidissement de Newton\" width=\"300\" height=\"131\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-Newtons-law-of-cooling-300x131.png\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-Newtons-law-of-cooling-300x131.png 300w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-Newtons-law-of-cooling.png 446w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><span style=\"\">Le <\/span><strong><span style=\"\">coefficient de transfert de chaleur global<\/span><\/strong><span style=\"\"> est li\u00e9 \u00e0 la <\/span><a href=\"http:\/\/nuclear-power.com\/nuclear-engineering\/heat-transfer\/thermal-conduction\/thermal-resistance-thermal-resistivity\/\" data-mce-href=\"http:\/\/nuclear-power.com\/nuclear-engineering\/heat-transfer\/thermal-conduction\/thermal-resistance-thermal-resistivity\/\"><span style=\"\">r\u00e9sistance thermique totale<\/span><\/a><span style=\"\"> et d\u00e9pend de la g\u00e9om\u00e9trie du probl\u00e8me.<\/span><\/p>\n<p><span style=\"\">En supposant un transfert de chaleur unidimensionnel \u00e0 travers la paroi plane et sans tenir compte du rayonnement, le <\/span><strong><span style=\"\">coefficient de transfert de chaleur global<\/span><\/strong><span style=\"\"> &nbsp;peut \u00eatre calcul\u00e9 comme suit:<\/span><\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-U-factor.png\" data-mce-href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-U-factor.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-medium wp-image-109300\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-U-factor-300x187.png\" alt=\"Calcul du transfert de chaleur - Facteur U\" width=\"300\" height=\"187\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-U-factor-300x187.png\" srcset=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-U-factor-300x187.png 300w, https:\/\/material-properties.org\/wp-content\/uploads\/2021\/05\/Heat-transfer-calculation-U-factor.png 478w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><span style=\"\">Le&nbsp;<\/span><strong><span style=\"\">coefficient de transfert thermique global <\/span><\/strong><span style=\"\">est alors: U = 1 \/ (1\/10 + 0,15\/0,13 + 1\/30) = 0,78 W\/m<\/span><sup><span style=\"\">2<\/span><\/sup><span style=\"\">K<\/span><\/p>\n<p><span style=\"\">Le flux de chaleur peut alors \u00eatre calcul\u00e9 simplement comme suit: q = 0,78 [W\/m<\/span><sup><span style=\"\">2<\/span><\/sup><span style=\"\">K] x 30 [K] = 23,31 W\/m<\/span><sup><span style=\"\">2<\/span><\/sup><\/p>\n<p><span style=\"\">La perte totale de chaleur \u00e0 travers ce mur sera de: <\/span><strong><span style=\"\">q<\/span><sub><span style=\"\">perte<\/span><\/sub> <\/strong><span style=\"\">= q . A = 23,31 [W\/m<\/span><sup><span style=\"\">2<\/span><\/sup><span style=\"\">] x 30 [m<\/span><sup><span style=\"\">2<\/span><\/sup><span style=\"\">] =&nbsp;<\/span><strong><span style=\"\">699,2 W<\/span><\/strong><\/p>\n<p><span style=\"\"><div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Point de fusion des mat\u00e9riaux<\/span><\/h3>\n<p><a href=\"https:\/\/material-properties.org\/melting-point-of-materials\/\" data-mce-href=\"https:\/\/material-properties.org\/melting-point-of-materials\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108050 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Metling-Point-300x183.png\" alt=\"Tableau des mat\u00e9riaux - Point de fusion\" width=\"300\" height=\"183\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Metling-Point-300x183.png\"\/><\/a><span style=\"\"><\/span><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Conductivit\u00e9 thermique des mat\u00e9riaux<\/span><\/h3>\n<p><a href=\"https:\/\/material-properties.org\/thermal-conductivity-of-materials\/\" data-mce-href=\"https:\/\/material-properties.org\/thermal-conductivity-of-materials\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108055 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Thermal-Conductivity-300x180.png\" alt=\"Tableau des mat\u00e9riaux - Conductivit\u00e9 thermique\" width=\"300\" height=\"180\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Thermal-Conductivity-300x180.png\"\/><\/a><span style=\"\"><\/span><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Capacit\u00e9 calorifique des mat\u00e9riaux<\/span><\/h3>\n<p><a href=\"https:\/\/material-properties.org\/heat-capacity-of-materials\/\" data-mce-href=\"https:\/\/material-properties.org\/heat-capacity-of-materials\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108063 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Heat-Capacity-300x179.png\" alt=\"Tableau des mat\u00e9riaux - Capacit\u00e9 calorifique\" width=\"300\" height=\"179\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Heat-Capacity-300x179.png\"\/><\/a><\/p>\n<h3 style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><\/h3>\n<p><span style=\"\"><\/span><\/p><\/div><\/div> <div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div><\/span><\/p>\n<p><span style=\"\"><div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">La r\u00e9sistance des mat\u00e9riaux<\/span><\/h3>\n<p><a href=\"https:\/\/material-properties.org\/strength-of-materials-tensile-yield\/\" data-mce-href=\"https:\/\/material-properties.org\/strength-of-materials-tensile-yield\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108070 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Strength-of-Materials-300x182.png\" alt=\"Tableau des mat\u00e9riaux - R\u00e9sistance des mat\u00e9riaux\" width=\"300\" height=\"182\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Strength-of-Materials-300x182.png\"\/><\/a><span style=\"\"><\/span><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">\u00c9lasticit\u00e9 des mat\u00e9riaux<\/span><\/h3>\n<p><a href=\"https:\/\/material-properties.org\/elasticity-of-materials\/\" data-mce-href=\"https:\/\/material-properties.org\/elasticity-of-materials\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108080 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Elasticity-of-Materials-300x185.png\" alt=\"Tableau des mat\u00e9riaux - \u00c9lasticit\u00e9 des mat\u00e9riaux\" width=\"300\" height=\"185\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Elasticity-of-Materials-300x185.png\"\/><\/a><span style=\"\"><\/span><\/p><\/div><\/div> <div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h3 style=\"text-align: center;\" data-mce-style=\"text-align: center;\"><span style=\"\">Duret\u00e9 des mat\u00e9riaux<\/span><\/h3>\n<p><a href=\"https:\/\/material-properties.org\/hardness-of-materials-brinell-mohs\/\" data-mce-href=\"https:\/\/material-properties.org\/hardness-of-materials-brinell-mohs\/\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-108085 size-medium\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Hardness-of-Materials-300x182.png\" alt=\"Tableau des mat\u00e9riaux - Duret\u00e9 des mat\u00e9riaux\" width=\"300\" height=\"182\" data-mce-src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2021\/02\/Material-Table-Hardness-of-Materials-300x182.png\"\/><\/a><span style=\"\">&nbsp; <\/span><\/p><\/div><\/div> <div class=\"su-divider su-divider-style-dotted\" style=\"margin:25px 0;border-width:3px;border-color:#999999\"><\/div><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00c0 propos du carburant diesel En g\u00e9n\u00e9ral, le carburant diesel est tout carburant liquide sp\u00e9cifiquement con\u00e7u pour \u00eatre utilis\u00e9 dans les moteurs diesel, dont l&rsquo;allumage du carburant a lieu, sans aucune \u00e9tincelle, \u00e0 la suite de la compression du m\u00e9lange d&rsquo;air d&rsquo;admission puis de l&rsquo;injection de carburant.&nbsp;Actuellement, la principale source de carburant pour les v\u00e9hicules &#8230; <a title=\"Carburant diesel &#8211; Densit\u00e9 &#8211; Point de fusion &#8211; Conductivit\u00e9 thermique\" class=\"read-more\" href=\"https:\/\/material-properties.org\/fr\/carburant-diesel-densite-point-de-fusion-conductivite-thermique\/\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - 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