{"id":43935,"date":"2019-10-14T04:29:38","date_gmt":"2019-10-14T03:29:38","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-la-force-de-friction-aerodynamique-definition\/"},"modified":"2020-02-17T10:52:18","modified_gmt":"2020-02-17T09:52:18","slug":"quest-ce-que-la-force-de-friction-aerodynamique-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-force-de-friction-aerodynamique-definition\/","title":{"rendered":"Qu&#8217;est-ce que la force de friction a\u00e9rodynamique &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Force de friction a\u00e9rodynamique.\u00a0La force de friction est proportionnelle \u00e0 la surface.\u00a0Par cons\u00e9quent, les corps ayant une surface plus grande subiront une plus grande r\u00e9sistance \u00e0 la friction.\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>Force de friction a\u00e9rodynamique<\/h2>\n<figure id=\"attachment_20487\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-20487\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Drag-skin-friction-and-form-drag.png\"><img loading=\"lazy\" class=\"size-full wp-image-20487 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Drag-skin-friction-and-form-drag.png\" alt=\"Drag - friction de la peau et forme\" width=\"228\" height=\"343\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Drag-skin-friction-and-form-drag.png\" \/><\/a><figcaption id=\"caption-attachment-20487\" class=\"wp-caption-text\">Source: wikipedia.org Licence: CC BY-SA 3.0<\/figcaption><\/figure>\n<p>Comme cela\u00a0a \u00e9t\u00e9 \u00e9crit, lorsque circule un fluide sur une\u00a0<strong>surface fixe<\/strong>\u00a0, par exemple la plaque plane, le lit d&#8217;une rivi\u00e8re, ou la paroi d&#8217;un tuyau, le fluide de\u00a0toucher la surface est amen\u00e9e\u00a0<strong>\u00e0 reposer<\/strong>\u00a0par la\u00a0<strong>contrainte de cisaillement<\/strong>\u00a0au niveau de\u00a0la paroi.\u00a0La r\u00e9gion dans laquelle l&#8217;\u00e9coulement s&#8217;ajuste d&#8217;une vitesse nulle au mur \u00e0 un maximum dans le flux principal de l&#8217;\u00e9coulement est appel\u00e9e\u00a0<a title=\"Couche limite\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-couche-limite-definition\/\"><strong>couche limite<\/strong><\/a>\u00a0.\u00a0Par cons\u00e9quent, un fluide en mouvement exerce des forces de cisaillement tangentielles sur la surface en raison de la\u00a0<strong>condition antid\u00e9rapante<\/strong>\u00a0caus\u00e9e par des effets visqueux.\u00a0Ce type de\u00a0<a title=\"Drag Force - Equation de Drag\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/what-is-drag-air-and-fluid-resistance\/drag-force-drag-equation\/\"><strong>force<\/strong><\/a>\u00a0de\u00a0<a title=\"Drag Force \u2013 Drag Equation\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/what-is-drag-air-and-fluid-resistance\/drag-force-drag-equation\/\"><strong>tra\u00een\u00e9e<\/strong><\/a>\u00a0d\u00e9pend notamment de la g\u00e9om\u00e9trie, de la rugosit\u00e9 de la surface solide (uniquement en\u00a0<a title=\"\u00c9coulement turbulent\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-quun-ecoulement-turbulent-definition\/\">\u00e9coulement turbulent<\/a>\u00a0) et du\u00a0<a title=\"R\u00e9gime d'\u00e9coulement\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/flow-regime\/\">type d&#8217;\u00e9coulement du fluide.<\/a>.\u00a0La force de friction a\u00e9rodynamique est proportionnelle \u00e0 la surface.\u00a0Par cons\u00e9quent, les corps ayant une surface plus grande subiront une plus grande r\u00e9sistance \u00e0 la friction.\u00a0C&#8217;est pourquoi les avions commerciaux r\u00e9duisent leur surface totale pour \u00e9conomiser du carburant.\u00a0<strong>La tra\u00een\u00e9e de frottement<\/strong>\u00a0est une fonction importante de la viscosit\u00e9 et un fluide \u00abid\u00e9alis\u00e9\u00bb de viscosit\u00e9 nulle produirait une tra\u00een\u00e9e de frottement nulle puisque la contrainte de cisaillement de la paroi serait nulle.<\/p>\n<p><a title=\"Friction de la peau - Drag Friction\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/what-is-drag-air-and-fluid-resistance\/skin-friction-friction-drag\/\"><strong>Le frottement de la peau<\/strong><\/a>\u00a0est caus\u00e9 par une tra\u00een\u00e9e visqueuse dans la couche limite autour de l&#8217;objet.\u00a0Les caract\u00e9ristiques de base de toutes<strong>\u00a0les couches limites laminaires et turbulentes<\/strong>\u00a0sont pr\u00e9sent\u00e9es dans le flux en d\u00e9veloppement sur une plaque plate.\u00a0Les \u00e9tapes de la formation de la couche limite sont indiqu\u00e9es dans la figure ci-dessous:<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boundary-layer-on-flat-plate.png\"><img loading=\"lazy\" class=\"aligncenter size-large wp-image-14390 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boundary-layer-on-flat-plate-1024x357.png\" alt=\"Couche limite sur une plaque plate\" width=\"669\" height=\"233\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boundary-layer-on-flat-plate-1024x357.png\" \/><\/a><\/p>\n<p><strong>Les couches limites<\/strong>\u00a0peuvent \u00eatre soit\u00a0<strong>laminaire<\/strong>\u00a0ou\u00a0<strong>turbulent<\/strong>\u00a0en fonction de la valeur de\u00a0<strong>la\u00a0<a title=\"Le num\u00e9ro de Reynold\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/reynolds-number\/\">nombre de\u00a0Reynolds<\/a><\/strong>\u00a0.<\/p>\n<p>Pour\u00a0<strong>les nombres de Reynolds inf\u00e9rieurs<\/strong>\u00a0, la couche limite est laminaire et la vitesse dans le flux change uniform\u00e9ment \u00e0 mesure que l&#8217;on s&#8217;\u00e9loigne du mur, comme indiqu\u00e9 \u00e0 gauche de la figure.\u00a0<strong>\u00c0 mesure que le nombre de Reynolds augmente<\/strong>\u00a0(avec x), l&#8217;\u00a0<strong>\u00e9coulement devient instable<\/strong>\u00a0et finalement, pour les nombres de Reynolds sup\u00e9rieurs, la couche limite est turbulente et la vitesse en aval est caract\u00e9ris\u00e9e par des \u00e9coulements tourbillonnants instables (changeant dans le temps) \u00e0 l&#8217;int\u00e9rieur de la couche limite.<\/p>\n<p><strong>La transition de la<\/strong>\u00a0couche limite\u00a0<strong>laminaire \u00e0 la<\/strong>\u00a0couche\u00a0<strong>turbulente<\/strong>\u00a0se produit lorsque le nombre de Reynolds \u00e0 x d\u00e9passe\u00a0<strong>Re\u00a0<\/strong><strong><sub>x<\/sub><\/strong><strong>\u00a0~ 500 000<\/strong>\u00a0.\u00a0La transition peut se produire plus t\u00f4t, mais cela d\u00e9pend surtout de la\u00a0<strong>rugosit\u00e9 de<\/strong>\u00a0la\u00a0<strong>surface<\/strong>\u00a0.\u00a0La couche limite turbulente s&#8217;\u00e9paissit plus rapidement que la couche limite laminaire en raison de la contrainte de cisaillement accrue \u00e0 la surface du corps.<\/p>\n<p>Il existe deux mani\u00e8res de\u00a0<strong>r\u00e9duire la tra\u00een\u00e9e de friction<\/strong>\u00a0:<\/p>\n<ul>\n<li>le premier consiste \u00e0 fa\u00e7onner le corps en mouvement de mani\u00e8re \u00e0 permettre un \u00e9coulement laminaire<\/li>\n<li>la deuxi\u00e8me m\u00e9thode consiste \u00e0 augmenter la longueur et \u00e0 r\u00e9duire la section transversale de l&#8217;objet en mouvement autant que possible.<\/li>\n<\/ul>\n<p>Le\u00a0<strong>coefficient de friction de la peau<\/strong>\u00a0,\u00a0<strong>C\u00a0<sub>D, friction<\/sub><\/strong>\u00a0, est d\u00e9fini par<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/skin-friction-equation-drag-coefficient.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20489 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/skin-friction-equation-drag-coefficient.png\" alt=\"friction de la peau - \u00e9quation - coefficient de tra\u00een\u00e9e\" width=\"217\" height=\"126\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/skin-friction-equation-drag-coefficient.png\" \/><\/a><\/p>\n<p><span>Il faut noter que le\u00a0<\/span><strong><span>coefficient de frottement cutan\u00e9<\/span><\/strong><span>\u00a0est \u00e9gal au\u00a0<\/span><strong><a title=\"Facteur de friction de ventilation\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/fanning-friction-factor\/\"><span>facteur de frottement de Fanning<\/span><\/a><\/strong><span>\u00a0.\u00a0Le facteur de friction de Fanning, nomm\u00e9 d&#8217;apr\u00e8s John Thomas Fanning, est un nombre sans dimension, c&#8217;est-\u00e0-dire un quart du\u00a0<\/span><a title=\"Facteur de friction Darcy\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-le-facteur-de-friction-de-darcy-definition\/\"><strong><span>facteur de friction de Darcy<\/span><\/strong><\/a><span>\u00a0.\u00a0Comme on peut le voir, il existe un lien entre\u00a0<\/span><strong><span>les forces de friction cutan\u00e9e<\/span><\/strong><span>\u00a0et les\u00a0<\/span><a title=\"Perte de t\u00eate majeure - Perte par friction\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/\"><strong><span>pertes de charge par friction<\/span><\/strong><\/a><span>\u00a0.<\/span><\/p>\n<p><span>Voir aussi:\u00a0<\/span><a title=\"Facteur de friction Darcy\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-le-facteur-de-friction-de-darcy-definition\/\"><strong><span>Facteur de friction Darcy<\/span><\/strong><\/a><\/p>\n<p><span>Pour\u00a0<\/span><a title=\"\u00c9coulement laminaire - \u00c9coulement visqueux\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-lecoulement-laminaire-ecoulement-visqueux-definition\/\"><span>l&#8217;\u00e9coulement laminaire<\/span><\/a><span>\u00a0dans une conduite, le\u00a0<\/span><strong><span>facteur de frottement de Fanning<\/span><\/strong><span>\u00a0(coefficient de frottement cutan\u00e9) est une cons\u00e9quence de\u00a0<\/span><strong><span>la loi<\/span><\/strong><span>\u00a0de\u00a0<strong>Poiseuille<\/strong>\u00a0et il est donn\u00e9 par les \u00e9quations suivantes:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-laminar-flow.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20490 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-laminar-flow.png\" alt=\"coefficient de tra\u00een\u00e9e - \u00e9coulement laminaire\" width=\"312\" height=\"195\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-laminar-flow.png\" \/><\/a><\/p>\n<p><span>Dans\u00a0<\/span><a title=\"\u00c9coulement turbulent\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-quun-ecoulement-turbulent-definition\/\"><span>les \u00e9coulements turbulents<\/span><\/a><span>\u00a0, cependant, les choses sont plus difficiles, car le facteur de friction d\u00e9pend fortement de la\u00a0<\/span><a title=\"Rugosit\u00e9 relative du tuyau\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/relative-roughness-of-pipe\/\"><span>rugosit\u00e9<\/span><\/a><span>\u00a0du\u00a0<a title=\"Rugosit\u00e9 relative du tuyau\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/relative-roughness-of-pipe\/\">tuyau<\/a>\u00a0.\u00a0Le\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-le-facteur-de-friction-de-darcy-definition\/\"><strong><span>facteur de friction<\/span><\/strong><\/a><span>\u00a0pour l&#8217;\u00e9coulement du fluide peut \u00eatre d\u00e9termin\u00e9 \u00e0 l&#8217;aide d&#8217;un\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/moody-diagram\/\"><strong><span>diagramme de Moody<\/span><\/strong><\/a><span>\u00a0.\u00a0Par exemple:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-turbulent-flow.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20491 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-turbulent-flow.png\" alt=\"coefficient de tra\u00een\u00e9e - \u00e9coulement turbulent\" width=\"357\" height=\"189\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-turbulent-flow.png\" \/><\/a><\/p>\n<p><span>La composante de friction de la\u00a0<\/span><strong><span>force de tra\u00een\u00e9e<\/span><\/strong><span>\u00a0est donn\u00e9e par:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-force-skin-friction.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20492 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-force-skin-friction.png\" alt=\"force de tra\u00een\u00e9e - frottement de la peau\" width=\"345\" height=\"79\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-force-skin-friction.png\" \/><\/a><\/p>\n<\/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>Force de friction a\u00e9rodynamique.\u00a0La force de friction est proportionnelle \u00e0 la surface.\u00a0Par cons\u00e9quent, les corps ayant une surface plus grande subiront une plus grande r\u00e9sistance \u00e0 la friction.\u00a0G\u00e9nie thermique Force de friction a\u00e9rodynamique Source: wikipedia.org Licence: CC BY-SA 3.0 Comme cela\u00a0a \u00e9t\u00e9 \u00e9crit, lorsque circule un fluide sur une\u00a0surface fixe\u00a0, par exemple la plaque plane, &#8230; <a title=\"Qu&#8217;est-ce que la force de friction a\u00e9rodynamique &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-force-de-friction-aerodynamique-definition\/\" aria-label=\"En savoir plus sur Qu&#8217;est-ce que la force de friction a\u00e9rodynamique &#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 force de friction a\u00e9rodynamique - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Force de friction a\u00e9rodynamique. 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