{"id":52559,"date":"2020-02-20T10:05:51","date_gmt":"2020-02-20T09:05:51","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-quun-processus-isothermique-et-un-processus-adiabatique-definition\/"},"modified":"2020-02-20T10:10:22","modified_gmt":"2020-02-20T09:10:22","slug":"quest-ce-quun-processus-isothermique-et-un-processus-adiabatique-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-quun-processus-isothermique-et-un-processus-adiabatique-definition\/","title":{"rendered":"Qu&#8217;est-ce qu&#8217;un processus isothermique et un processus adiabatique &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\"><span>Un processus adiabatique n&#8217;est pas n\u00e9cessairement un processus isotherme, ni un processus isotherme n\u00e9cessairement adiabatique.\u00a0Caract\u00e9ristiques des processus adiabatiques et isothermes.\u00a0G\u00e9nie thermique<\/span><\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Processus isotherme<\/span><\/h2>\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-plus su-spoiler-closed\">\n<div class=\"su-spoiler-content su-clearfix\">\n<figure id=\"attachment_17319\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-17319\">Un <strong>processus isotherme<\/strong>\u00a0est un\u00a0<a title=\"Processus thermodynamiques\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-quun-processus-thermodynamique-definition\/\"><strong>processus thermodynamique<\/strong><\/a>\u00a0, dans lequel la\u00a0<strong>temp\u00e9rature<\/strong>\u00a0du syst\u00e8me\u00a0<strong>reste constante<\/strong>\u00a0(T = const).\u00a0Le transfert de chaleur dans ou hors du syst\u00e8me doit g\u00e9n\u00e9ralement se produire \u00e0 un rythme aussi lent afin de s&#8217;adapter en permanence \u00e0 la temp\u00e9rature du r\u00e9servoir par \u00e9change de chaleur.\u00a0Dans chacun de ces \u00e9tats, l&#8217;\u00a0<a title=\"\u00c9quilibre thermique\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-temperature-physics\/thermal-equilibrium\/\"><strong>\u00e9quilibre thermique<\/strong><\/a>\u00a0est maintenu.<\/figure>\n<\/div>\n<\/div>\n<p><span>Pour un\u00a0<\/span><a title=\"Loi du gaz parfait\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/ideal-gas-law\/\"><strong><span>gaz parfait<\/span><\/strong>\u00a0<\/a><span>et un proc\u00e9d\u00e9 polytropique, le cas\u00a0<\/span><strong><em><span>n = 1<\/span><\/em><\/strong><span>\u00a0correspond \u00e0 un\u00a0proc\u00e9d\u00e9\u00a0<\/span><strong><span>isotherme<\/span><\/strong><span>\u00a0(\u00e0 temp\u00e9rature constante).\u00a0Contrairement au\u00a0<\/span><a title=\"Processus adiabatique\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quel-est-le-processus-adiabatique-definition\/\"><strong><span>processus adiabatique<\/span><\/strong><\/a><span>\u00a0, dans lequel\u00a0<\/span><strong><i><span>n = \u03ba<\/span><\/i><\/strong><em><span>\u00a0\u00a0 et\u00a0<\/span><\/em><em><span>un syst\u00e8me n&#8217;\u00e9change pas de chaleur avec son environnement (Q = 0;\u00a0<\/span><\/em><em><span>\u2206T \u2260 0\u00a0<\/span><\/em><em><span>)\u00a0<\/span><\/em><em><span>, dans un processus isotherme, il n&#8217;y a pas de changement dans l&#8217;\u00e9nergie interne (due \u00e0 \u2206T = 0 ) et donc\u00a0<\/span><\/em><em><span>\u0394U = 0 (pour les gaz id\u00e9aux) et Q \u2260 0.<\/span><\/em><span>\u00a0Un processus adiabatique n&#8217;est pas n\u00e9cessairement un processus isotherme, ni un processus isotherme n\u00e9cessairement adiabatique.<\/span><\/p>\n<p><span>En ing\u00e9nierie, les changements de phase, tels que l&#8217;\u00e9vaporation ou la fusion, sont des processus isothermes lorsque, comme c&#8217;est g\u00e9n\u00e9ralement le cas, ils se produisent \u00e0 pression et temp\u00e9rature constantes.<\/span><\/p>\n<div class=\"su-spacer\"><\/div>\n<h2><span>Processus isotherme et premi\u00e8re loi<\/span><\/h2>\n<p><span>La forme classique de la\u00a0<\/span><a title=\"Premi\u00e8re loi de la thermodynamique\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quelle-est-la-premiere-loi-de-la-thermodynamique-definition\/\"><span>premi\u00e8re loi de la thermodynamique<\/span><\/a><span>\u00a0est l&#8217;\u00e9quation suivante:<\/span><\/p>\n<p><strong><span>dU = dQ &#8211; dW<\/span><\/strong><\/p>\n<p><span>Dans cette \u00e9quation, dW est \u00e9gal \u00e0\u00a0<\/span><strong><span>dW = pdV<\/span><\/strong><span>\u00a0et est connu comme le\u00a0<\/span><a title=\"Travaux p\u0394V - Travaux aux limites et travaux V\u0394p\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/first-law-of-thermodynamics\/p%ce%b4v-work-boundary-work-and-v%ce%b4p-work\/\"><span>travail<\/span><\/a><span>\u00a0aux\u00a0<a title=\"Travaux p\u0394V - Travaux aux limites et travaux V\u0394p\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/first-law-of-thermodynamics\/p%ce%b4v-work-boundary-work-and-v%ce%b4p-work\/\">limites<\/a>\u00a0.<\/span><\/p>\n<p><span>Dans le\u00a0<\/span><strong><span>processus isotherme<\/span><\/strong><span>\u00a0et le\u00a0<\/span><a title=\"Loi du gaz parfait\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/ideal-gas-law\/\"><strong><span>gaz parfait<\/span><\/strong><\/a><span>\u00a0, toute la chaleur ajout\u00e9e au syst\u00e8me sera utilis\u00e9e pour effectuer les travaux:<\/span><\/p>\n<p><strong><span>Processus isotherme (dU = 0):<\/span><\/strong><\/p>\n<p><strong><span>dU = 0 = Q &#8211; W \u2192 W = Q \u00a0\u00a0<\/span><em>\u00a0\u00a0\u00a0\u00a0<\/em><\/strong><em><span>(pour le gaz parfait)<\/span><\/em><\/p>\n<p><span>Le\u00a0<\/span><strong><span>processus isotherme\u00a0<\/span><\/strong><span>\u00a0peut s&#8217;exprimer avec la\u00a0<\/span><strong><span>loi du gaz parfait<\/span><\/strong><span>\u00a0comme:<\/span><\/p>\n<p><strong><em><span>pV = constant<\/span><\/em><\/strong><\/p>\n<p><span>ou<\/span><\/p>\n<p><em><strong><span>p\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0V\u00a0<\/span><sub><span>1<\/span><\/sub><span>\u00a0\u00a0= p\u00a0<\/span><sub><span>2<\/span><\/sub><span>\u00a0V\u00a0<\/span><sub><span>2<\/span><\/sub><\/strong><\/em><\/p>\n<p><span>Sur un diagramme pV, le processus se produit le\u00a0long d&#8217;\u00a0une ligne (appel\u00e9e isotherme) qui a l&#8217;\u00e9quation\u00a0<\/span><strong><span>p = constante \/ V<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights  lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Processus adiabatique<\/span><\/h2>\n<p><span>Un\u00a0<strong>processus adiabatique<\/strong>\u00a0est un\u00a0<a title=\"Processus thermodynamiques\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-quun-processus-thermodynamique-definition\/\">processus thermodynamique<\/a>\u00a0, dans lequel il n&#8217;y a\u00a0<strong>pas de transfert de chaleur<\/strong>\u00a0dans ou hors du syst\u00e8me (Q = 0).\u00a0Le syst\u00e8me peut \u00eatre consid\u00e9r\u00e9 comme\u00a0<strong>parfaitement isol\u00e9<\/strong>\u00a0.\u00a0Dans un processus adiabatique, l&#8217;\u00e9nergie n&#8217;est transf\u00e9r\u00e9e que sous forme de travail.\u00a0L&#8217;hypoth\u00e8se d&#8217;absence de transfert de chaleur est tr\u00e8s importante, car nous ne pouvons utiliser l&#8217;approximation adiabatique que dans\u00a0<strong>des processus tr\u00e8s rapides<\/strong>\u00a0.\u00a0Dans ces processus rapides, il n&#8217;y a pas assez de temps pour que le transfert d&#8217;\u00e9nergie sous forme de chaleur ait lieu vers ou depuis le syst\u00e8me.<\/span><\/p>\n<p><span>Dans les appareils r\u00e9els (tels que les turbines, les pompes et les compresseurs),\u00a0<\/span><strong><span>des pertes de chaleur<\/span><\/strong><span>\u00a0et des pertes dans le processus de combustion se produisent, mais ces pertes sont g\u00e9n\u00e9ralement faibles par rapport au flux d&#8217;\u00e9nergie global et nous pouvons approximer certains processus thermodynamiques par le processus adiabatique.<\/span><\/p>\n<div class=\"su-spacer\"><\/div>\n<h2><span>Processus adiabatique et premi\u00e8re loi<\/span><\/h2>\n<p><span>Pour un syst\u00e8me ferm\u00e9, on peut \u00e9crire la\u00a0\u00a0<\/span><strong><a title=\"Premi\u00e8re loi en termes d'enthalpie dH = dQ + Vdp\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/first-law-of-thermodynamics\/first-law-in-terms-of-enthalpy-dh-dq-vdp\/\"><span>premi\u00e8re loi de la thermodynamique en termes d&#8217;enthalpie<\/span><\/a><\/strong><span>\u00a0:<\/span><\/p>\n<p><strong><span>dH = dQ + Vdp<\/span><\/strong><\/p>\n<p><span>Dans cette \u00e9quation, le terme\u00a0<\/span><strong><span>Vdp<\/span><\/strong><span>\u00a0est un\u00a0<\/span><strong><a title=\"Travaux p\u0394V - Travaux aux limites et travaux V\u0394p\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/first-law-of-thermodynamics\/p%ce%b4v-work-boundary-work-and-v%ce%b4p-work\/\"><span>travail de processus d&#8217;\u00e9coulement<\/span><\/a><span>\u00a0.\u00a0<\/span><\/strong><span>Ce travail, Vdp, est utilis\u00e9 pour des syst\u00e8mes \u00e0 flux ouvert comme une turbine ou une pompe dans lesquels il y a un \u00abdp\u00bb, c&#8217;est-\u00e0-dire un changement de pression.\u00a0Comme on peut le voir, cette forme de loi\u00a0<\/span><strong><span>simplifie la description du transfert d&#8217;\u00e9nergie<\/span><\/strong><span>\u00a0.\u00a0Dans le processus adiabatique, le\u00a0<\/span><strong><span>changement d&#8217;enthalpie<\/span><\/strong><span>\u00a0est \u00e9gal au\u00a0<\/span><strong><span>travail du processus d&#8217;\u00e9coulement<\/span><\/strong><span>\u00a0effectu\u00e9 sur ou par le syst\u00e8me:<\/span><\/p>\n<p><strong><span>Processus adiabatique (dQ = 0):<\/span><\/strong><\/p>\n<p><strong><span>dH = Vdp \u2192 W = H\u00a0<\/span><\/strong><strong><sub><span>2<\/span><\/sub><\/strong><strong><span>\u00a0&#8211; H\u00a0<\/span><\/strong><strong><sub><span>1<\/span><\/sub><\/strong><strong><span>\u00a0\u00a0\u00a0\u00a0\u00a0\u2192 H\u00a0<\/span><\/strong><strong><sub><span>2<\/span><\/sub><\/strong><strong><span>\u00a0&#8211; H\u00a0<\/span><\/strong><strong><sub><span>1<\/span><\/sub><\/strong><strong><span>\u00a0=\u00a0<\/span><em><span>C\u00a0<\/span><\/em><\/strong><strong><em><sub><span>p<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0(T\u00a0<\/span><\/em><\/strong><strong><em><sub><span>2<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0&#8211; T\u00a0<\/span><\/em><\/strong><strong><em><sub><span>1<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0) \u00a0\u00a0\u00a0<\/span><\/em><\/strong><em><span>\u00a0(pour un\u00a0\u00a0<\/span><a title=\"Qu'est-ce que le gaz parfait\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/ideal-gas-law\/what-is-ideal-gas\/\"><span>gaz parfait<\/span><\/a><span>\u00a0)<\/span><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Expansion adiabatique<\/span><\/h2>\n<figure id=\"attachment_17362\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-17362\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/P-V-diagram-adiabatic-process.png\"><img loading=\"lazy\" class=\"size-full wp-image-17362 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/P-V-diagram-adiabatic-process.png\" alt=\"Diagramme PV - processus adiabatique\" width=\"407\" height=\"340\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/P-V-diagram-adiabatic-process.png\" \/><\/a><figcaption id=\"caption-attachment-17362\" class=\"wp-caption-text\"><span>Supposons une expansion adiabatique de l&#8217;h\u00e9lium (3 \u2192 4) dans une turbine \u00e0 gaz (cycle de Brayton).<\/span><\/figcaption><\/figure>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Expansion gratuite &#8211; Expansion Joule<\/span><\/h2>\n<p><span>Ce sont\u00a0<\/span><a title=\"Processus adiabatique\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quel-est-le-processus-adiabatique-definition\/\"><strong><span>des processus adiabatiques<\/span><\/strong><\/a><span>\u00a0dans lesquels\u00a0<\/span><strong><span>aucun transfert de chaleur ne<\/span><\/strong><span>\u00a0se produit entre le syst\u00e8me et son environnement et\u00a0<\/span><strong><span>aucun travail n&#8217;est effectu\u00e9<\/span><\/strong><span>\u00a0sur ou par le syst\u00e8me.\u00a0Ces types de processus adiabatiques sont appel\u00e9s\u00a0<\/span><strong><span>expansion libre<\/span><\/strong><span>\u00a0.\u00a0Il s&#8217;agit d&#8217;un\u00a0<\/span><strong><span>processus irr\u00e9versible<\/span><\/strong><span>\u00a0dans lequel un gaz se d\u00e9tend dans une chambre sous vide isol\u00e9e.\u00a0Il est \u00e9galement appel\u00e9\u00a0<\/span><strong><span>expansion Joule<\/span><\/strong><span>\u00a0.\u00a0Pour un gaz parfait, la temp\u00e9rature ne change pas\u00a0<\/span><strong><span>(cela signifie que le processus est \u00e9galement\u00a0<\/span><span>isotherme<\/span><span>\u00a0)<\/span><\/strong><span>\u00a0, cependant, les vrais gaz subissent un changement de temp\u00e9rature pendant la d\u00e9tente libre.\u00a0En expansion libre Q = W = 0, et le premi\u00e8re principe exige que:<\/span><\/p>\n<p><strong><span>dE\u00a0<\/span><\/strong><strong><sub><span>int<\/span><\/sub><\/strong><strong><span>\u00a0= 0<\/span><\/strong><\/p>\n<p><span>Une expansion libre ne peut pas \u00eatre trac\u00e9e sur un diagramme PV, car le processus est rapide et non quasi statique.\u00a0Les \u00e9tats interm\u00e9diaires ne sont pas des \u00e9tats d&#8217;\u00e9quilibre, et donc la pression n&#8217;est pas clairement d\u00e9finie.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\"><\/div>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Cet article est bas\u00e9 sur la traduction automatique de l&#8217;article original en anglais. Pour plus d&#8217;informations, voir l&#8217;article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l&#8217;adresse: translations@nuclear-power.com ou remplissez le formulaire de traduction en ligne. Nous appr\u00e9cions votre aide, nous mettrons \u00e0 jour la traduction le plus rapidement possible. Merci<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un processus adiabatique n&#8217;est pas n\u00e9cessairement un processus isotherme, ni un processus isotherme n\u00e9cessairement adiabatique.\u00a0Caract\u00e9ristiques des processus adiabatiques et isothermes.\u00a0G\u00e9nie thermique Processus isotherme Un processus isotherme\u00a0est un\u00a0processus thermodynamique\u00a0, dans lequel la\u00a0temp\u00e9rature\u00a0du syst\u00e8me\u00a0reste constante\u00a0(T = const).\u00a0Le transfert de chaleur dans ou hors du syst\u00e8me doit g\u00e9n\u00e9ralement se produire \u00e0 un rythme aussi lent afin de s&#8217;adapter &#8230; <a title=\"Qu&#8217;est-ce qu&#8217;un processus isothermique et un processus adiabatique &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-quun-processus-isothermique-et-un-processus-adiabatique-definition\/\" aria-label=\"En savoir plus sur Qu&#8217;est-ce qu&#8217;un processus isothermique et un processus adiabatique &#8211; D\u00e9finition\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu&#039;est-ce qu&#039;un processus isothermique et un processus adiabatique - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Un processus adiabatique n&#039;est pas n\u00e9cessairement un processus isothermique, pas plus qu&#039;un processus isothermique n&#039;est n\u00e9cessairement adiabatique. Caract\u00e9ristiques des processus adiabatiques et isothermes. G\u00e9nie thermique\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-quun-processus-isothermique-et-un-processus-adiabatique-definition\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Qu&#039;est-ce qu&#039;un processus isothermique et un processus adiabatique - D\u00e9finition\" \/>\n<meta property=\"og:description\" content=\"Un processus adiabatique n&#039;est pas n\u00e9cessairement un processus isothermique, pas plus qu&#039;un processus isothermique n&#039;est n\u00e9cessairement adiabatique. Caract\u00e9ristiques des processus adiabatiques et isothermes. 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