{"id":43138,"date":"2019-10-08T06:46:27","date_gmt":"2019-10-08T05:46:27","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-la-loi-de-stefan-boltzmann-constante-de-stefan-boltzmann-definition\/"},"modified":"2020-02-06T09:49:08","modified_gmt":"2020-02-06T08:49:08","slug":"quest-ce-que-la-loi-de-stefan-boltzmann-constante-de-stefan-boltzmann-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-loi-de-stefan-boltzmann-constante-de-stefan-boltzmann-definition\/","title":{"rendered":"Qu&#8217;est-ce que la loi de Stefan \u2013 Boltzmann? &#8211; Constante de Stefan-Boltzmann &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">La loi de Stefan \u2013 Boltzmann donne l&#8217;intensit\u00e9 de rayonnement d&#8217;un seul objet.\u00a0La constante de Stefan \u2013 Boltzmann doit son nom \u00e0 Josef Stefan et \u00e0 Ludwig Boltzman.\u00a0G\u00e9nie thermique<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/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>Loi Stefan \u2013 Boltzmann<\/h2>\n<p><strong>Le<\/strong>\u00a0taux de\u00a0<strong>transfert de chaleur par rayonnement<\/strong>\u00a0, q [W \/ m\u00a0<sup>2<\/sup>\u00a0], d&#8217;un corps (par exemple un corps noir) \u00e0 son environnement est proportionnel \u00e0 la\u00a0<strong>quatri\u00e8me puissance<\/strong>\u00a0de la\u00a0<a title=\"\u00c9chelle Kelvin - Temp\u00e9rature absolue\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-temperature-physics\/kelvin-scale-absolute-temperature\/\">temp\u00e9rature absolue<\/a>\u00a0et peut \u00eatre exprim\u00e9 par l&#8217;\u00e9quation suivante:<\/p>\n<p><strong><em>q = \u03b5\u03c3T\u00a0<\/em><em><sup>4<\/sup><\/em><\/strong><\/p>\n<p>o\u00f9\u00a0<strong>\u03c3<\/strong>\u00a0est une constante physique fondamentale appel\u00e9e constante de\u00a0<strong>Stefan \u2013 Boltzmann<\/strong>\u00a0, \u00e9gale \u00e0\u00a0<strong>5,6977 \u00d7 10\u00a0<\/strong><strong><sup>-8<\/sup><\/strong><strong>\u00a0W \/ m\u00a0<\/strong><strong><sup>2<\/sup><\/strong><strong>\u00a0K\u00a0<\/strong><strong><sup>4<\/sup><\/strong>\u00a0.\u00a0La\u00a0<strong>constante de Stefan \u2013 Boltzmann doit son<\/strong>\u00a0nom \u00e0 Josef Stefan (qui a d\u00e9couvert la loi de Stefa-Boltzman \u00e0 titre exp\u00e9rimental en 1879) et \u00e0 Ludwig Boltzmann (qui l&#8217;a d\u00e9riv\u00e9 th\u00e9oriquement peu de temps apr\u00e8s).\u00a0Comme on peut le constater, le transfert de chaleur par rayonnement est important\u00a0<strong>\u00e0 tr\u00e8s haute temp\u00e9rature<\/strong>\u00a0et\u00a0<strong>dans le vide<\/strong> .<\/p>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\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\"><span>Comme il a \u00e9t\u00e9 \u00e9crit, la\u00a0<\/span><strong><span>loi de Stefan \u2013 Boltzmann\u00a0\u00a0<\/span><span>donne l&#8217;intensit\u00e9 rayonnante d&#8217;un seul objet<\/span><\/strong><span>\u00a0.\u00a0Mais en utilisant la\u00a0<\/span><strong><span>loi de Stefan \u2013 Boltzmann<\/span><\/strong><span>\u00a0, nous pouvons \u00e9galement d\u00e9terminer le transfert de chaleur par rayonnement entre deux objets.\u00a0Deux corps qui rayonnent l&#8217;un vers l&#8217;autre ont un flux de chaleur net entre eux.\u00a0Le d\u00e9bit net de chaleur entre eux est donn\u00e9 par:<\/span><strong><em><span>Q = \u03b5\u03c3A\u00a0<\/span><\/em><\/strong><strong><em><sub><span>1-2<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0(T\u00a0<\/span><\/em><\/strong><strong><em><sup><span>4\u00a0<\/span><\/sup><\/em><\/strong><strong><em><sub><span>1<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0-T\u00a0<\/span><\/em><\/strong><strong><em><sup><span>4\u00a0<\/span><\/sup><\/em><\/strong><strong><em><sub><span>2<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0) [J \/ s]<\/span><\/em><\/strong><\/p>\n<p><strong><em><span>q = \u03b5\u03c3 (T\u00a0<\/span><\/em><\/strong><strong><em><sup><span>4\u00a0<\/span><\/sup><\/em><\/strong><strong><em><sub><span>1<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0-T\u00a0<\/span><\/em><\/strong><strong><em><sup><span>4\u00a0<\/span><\/sup><\/em><\/strong><strong><em><sub><span>2<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0) [J \/ m\u00a0<\/span><\/em><\/strong><strong><em><sup><span>2<\/span><\/sup><\/em><\/strong><strong><em><span>\u00a0s]<\/span><\/em><\/strong><\/p>\n<p><span>Le facteur de surface A\u00a0<\/span><sub><span>1-2<\/span><\/sub><span>\u00a0est la surface vue par le corps 2 du corps 1 et peut devenir assez difficile \u00e0 calculer.<\/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\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Rayonnement du corps noir<\/span><\/h2>\n<p><span>Il est connu que la quantit\u00e9 d&#8217;\u00e9nergie de rayonnement \u00e9mise par une surface \u00e0 une longueur d&#8217;onde donn\u00e9e d\u00e9pend du\u00a0<\/span><strong><span>mat\u00e9riau<\/span><\/strong><span>\u00a0du corps et de l&#8217;\u00e9tat de sa\u00a0<\/span><strong><span>surface<\/span><\/strong><span>\u00a0ainsi que de la\u00a0<\/span><a title=\"Qu'est-ce que la temp\u00e9rature - Physique\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-temperature-physique-definition\/\"><strong><span>temp\u00e9rature de<\/span><\/strong><\/a><span>\u00a0surface\u00a0.\u00a0Par cons\u00e9quent, divers mat\u00e9riaux \u00e9mettent diff\u00e9rentes quantit\u00e9s d&#8217;\u00e9nergie rayonnante m\u00eame lorsqu&#8217;ils sont \u00e0 la m\u00eame temp\u00e9rature.\u00a0Un\u00a0<\/span><strong><span>corps<\/span><\/strong><span>\u00a0qui \u00e9met le\u00a0<\/span><strong><span>maximum<\/span><\/strong><span>\u00a0de chaleur pour sa temp\u00e9rature absolue est appel\u00e9\u00a0<\/span><strong><span>corps noir<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/blackbody-radiation-chart-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-20968 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/blackbody-radiation-chart-min-300x181.png\" alt=\"rayonnement du corps noir\" width=\"300\" height=\"181\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/blackbody-radiation-chart-min-300x181.png\" \/><\/a><span>Un\u00a0<\/span><strong><span>corps noir<\/span><\/strong><span>\u00a0est un corps physique id\u00e9alis\u00e9, qui poss\u00e8de des propri\u00e9t\u00e9s sp\u00e9cifiques.\u00a0Par d\u00e9finition, un corps noir en \u00e9quilibre thermique a une\u00a0<\/span><strong><span>\u00e9missivit\u00e9<\/span><\/strong><span>\u00a0de\u00a0<\/span><strong><em><span>\u03b5<\/span><\/em><span>\u00a0= 1.0<\/span><\/strong><span>\u00a0.\u00a0Les vrais objets ne d\u00e9gagent pas autant de chaleur qu&#8217;un corps noir parfait.\u00a0Ils d\u00e9gagent moins de chaleur qu&#8217;un corps noir et sont donc appel\u00e9s corps gris.<\/span><\/p>\n<p><span>La surface d&#8217;un corps noir \u00e9met un rayonnement thermique \u00e0 raison d&#8217;environ 448 watts par m\u00e8tre carr\u00e9 \u00e0 temp\u00e9rature ambiante (25 \u00b0 C, 298,15 K).\u00a0Les objets r\u00e9els avec des \u00e9missivit\u00e9s inf\u00e9rieures \u00e0 1,0 (par exemple, un fil de cuivre) \u00e9mettent un rayonnement \u00e0 des taux correspondants plus faibles (par exemple 448 x 0,03 = 13,4 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0).\u00a0<\/span><strong><span>L&#8217;\u00e9missivit\u00e9<\/span><\/strong><span>\u00a0joue un r\u00f4le important dans les probl\u00e8mes de transfert de chaleur.\u00a0Par exemple, les capteurs solaires thermiques incorporent des surfaces s\u00e9lectives qui ont de tr\u00e8s faibles \u00e9missivit\u00e9s.\u00a0Ces capteurs gaspillent tr\u00e8s peu d&#8217;\u00e9nergie solaire par l&#8217;\u00e9mission de rayonnement thermique.<\/span><\/p>\n<p><span>Puisque l&#8217;\u00a0<\/span><strong><span>absorptivit\u00e9<\/span><\/strong><span>\u00a0et l&#8217;\u00a0<\/span><strong><span>\u00e9missivit\u00e9<\/span><\/strong><span>\u00a0sont interconnect\u00e9es par la\u00a0<\/span><strong><span>loi de Kirchhoff sur le rayonnement thermique<\/span><\/strong><span>\u00a0, un\u00a0<\/span><strong><span>corps noir<\/span><\/strong><span>\u00a0est \u00e9galement un parfait absorbeur de rayonnement \u00e9lectromagn\u00e9tique.<\/span><\/p>\n<p><em><strong><span>Loi de Kirchhoff sur le rayonnement thermique<\/span><\/strong><span>\u00a0:<\/span><\/em><\/p>\n<p><em><span>Pour un corps arbitraire \u00e9mettant et absorbant un rayonnement thermique en \u00e9quilibre thermodynamique, l&#8217;\u00e9missivit\u00e9 est \u00e9gale \u00e0 l&#8217;absorptivit\u00e9.<\/span><\/em><\/p>\n<p><strong><span>\u00e9missivit\u00e9 \u03b5 = absorptivit\u00e9 \u03b1<\/span><\/strong><\/p>\n<p><span>Un\u00a0<\/span><strong><span>corps noir<\/span><\/strong><span>\u00a0absorbe tous les rayonnements \u00e9lectromagn\u00e9tiques incidents, ind\u00e9pendamment de la fr\u00e9quence ou de l&#8217;angle d&#8217;incidence.\u00a0Sa\u00a0<\/span><strong><span>capacit\u00e9 d&#8217;absorption<\/span><\/strong><span>\u00a0est donc \u00e9gale \u00e0 l&#8217;unit\u00e9, qui est \u00e9galement la valeur la plus \u00e9lev\u00e9e possible.\u00a0Autrement dit, un\u00a0<\/span><strong><span>corps noir<\/span><\/strong><span>\u00a0est un\u00a0<\/span><strong><span>absorbeur parfait<\/span><\/strong><span>\u00a0(et un\u00a0<\/span><strong><span>\u00e9metteur parfait<\/span><\/strong><span>\u00a0).<\/span><\/p>\n<p><span>Notez que le rayonnement visible occupe une bande tr\u00e8s \u00e9troite du spectre de 0,4 \u00e0 0,76 nm, nous ne pouvons pas porter de jugement sur la noirceur d&#8217;une surface sur la base d&#8217;observations visuelles.\u00a0Par exemple, consid\u00e9rons le papier blanc qui r\u00e9fl\u00e9chit la lumi\u00e8re visible et appara\u00eet donc blanc.\u00a0En revanche, il est essentiellement noir pour le rayonnement infrarouge (\u00a0<\/span><strong><span>absorptivit\u00e9 \u03b1 = 0,94<\/span><\/strong><span> ) car ils absorbent fortement le rayonnement \u00e0 grande longueur d&#8217;onde.<\/span><\/p>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/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>\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<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>La loi de Stefan \u2013 Boltzmann donne l&#8217;intensit\u00e9 de rayonnement d&#8217;un seul objet.\u00a0La constante de Stefan \u2013 Boltzmann doit son nom \u00e0 Josef Stefan et \u00e0 Ludwig Boltzman.\u00a0G\u00e9nie thermique Loi Stefan \u2013 Boltzmann Le\u00a0taux de\u00a0transfert de chaleur par rayonnement\u00a0, q [W \/ m\u00a02\u00a0], d&#8217;un corps (par exemple un corps noir) \u00e0 son environnement est proportionnel &#8230; <a title=\"Qu&#8217;est-ce que la loi de Stefan \u2013 Boltzmann? &#8211; Constante de Stefan-Boltzmann &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-loi-de-stefan-boltzmann-constante-de-stefan-boltzmann-definition\/\" aria-label=\"En savoir plus sur Qu&#8217;est-ce que la loi de Stefan \u2013 Boltzmann? &#8211; Constante de Stefan-Boltzmann &#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 que la loi de Stefan \u2013 Boltzmann? - Constante de Stefan-Boltzmann - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"La loi de Stefan \u2013 Boltzmann donne l&#039;intensit\u00e9 de rayonnement d&#039;un seul objet. 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