{"id":43174,"date":"2019-10-08T09:44:59","date_gmt":"2019-10-08T08:44:59","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-la-force-de-resistance-hydraulique-definition\/"},"modified":"2020-02-06T10:29:57","modified_gmt":"2020-02-06T09:29:57","slug":"quest-ce-que-la-force-de-resistance-hydraulique-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-force-de-resistance-hydraulique-definition\/","title":{"rendered":"Qu’est-ce que la force de r\u00e9sistance hydraulique – D\u00e9finition"},"content":{"rendered":"
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Force de r\u00e9sistance hydraulique.\u00a0Le d\u00e9bit naturel de circulation, V, est d\u00e9termin\u00e9 \u00e0 partir de l\u2019\u00e9quilibre entre la t\u00eate motrice et les forces r\u00e9sistantes.\u00a0G\u00e9nie thermique<\/div>\n<\/div>\n
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Force de r\u00e9sistance hydraulique<\/h2>\n

\"PLC<\/a>Comme il a \u00e9t\u00e9 \u00e9crit,\u00a0le d\u00e9bit de circulation naturelle<\/strong>\u00a0, V, dans la boucle, dans des conditions stables, est d\u00e9termin\u00e9 \u00e0 partir de l\u2019\u00e9quilibre entre la t\u00eate motrice et les forces r\u00e9sistantes.\u00a0\u00c0 l’instar du frottement dans les conduites, les\u00a0pertes de charge globales<\/strong>\u00a0sont\u00a0proportionnelles au carr\u00e9 du d\u00e9bit<\/strong>\u00a0et peuvent donc \u00eatre facilement int\u00e9gr\u00e9es \u00e0 l’\u00a0\u00e9quation de Darcy-Weisbach<\/strong><\/a>\u00a0.\u00a0Les ing\u00e9nieurs utilisent souvent le\u00a0coefficient de perte de pression<\/strong><\/a>\u00a0,\u00a0PLC<\/strong>\u00a0.\u00a0Il est not\u00e9 K ou\u00a0\u03be<\/strong>\u00a0(prononc\u00e9 \u00abxi\u00bb).\u00a0Ce coefficient caract\u00e9rise\u00a0la perte de charge<\/a>d’un certain syst\u00e8me hydraulique ou d’une partie d’un syst\u00e8me hydraulique.\u00a0Il peut \u00eatre facilement mesur\u00e9 dans les boucles hydrauliques.\u00a0Le coefficient de perte de charge peut \u00eatre d\u00e9fini ou mesur\u00e9 pour les deux conduites droites et en particulier pour\u00a0les pertes locales (mineures)<\/strong><\/a>\u00a0.\u00a0Le\u00a0facteur de friction de Darcy<\/a>\u00a0\u00e9tant fonction de la vitesse (en nombre de Reynolds), le calcul du coefficient de perte de pression est un processus it\u00e9ratif.<\/p>\n<\/div>\n<\/div>\n

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Circulation naturelle – d\u00e9bit<\/h2>\n

Le<\/strong>\u00a0d\u00e9bit\u00a0naturel de circulation<\/strong>\u00a0dans la boucle, dans des conditions stables, est d\u00e9termin\u00e9 \u00e0 partir de l\u2019\u00a0\u00e9quilibre<\/strong>\u00a0entre les\u00a0forces\u00a0<\/strong>motrice<\/strong>\u00a0et\u00a0r\u00e9sistante<\/strong>\u00a0.\u00a0La force motrice r\u00e9sulte de la diff\u00e9rence de densit\u00e9 entre la jambe chaude et la jambe froide de la boucle.\u00a0La t\u00eate requise pour compenser les pertes de charge est cr\u00e9\u00e9e par les gradients de densit\u00e9 et les changements d’altitude.<\/p>\n<\/div>\n<\/div>\n

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Force de r\u00e9sistance hydraulique.\u00a0Le d\u00e9bit naturel de circulation, V, est d\u00e9termin\u00e9 \u00e0 partir de l\u2019\u00e9quilibre entre la t\u00eate motrice et les forces r\u00e9sistantes.\u00a0G\u00e9nie thermique Force de r\u00e9sistance hydraulique Comme il a \u00e9t\u00e9 \u00e9crit,\u00a0le d\u00e9bit de circulation naturelle\u00a0, V, dans la boucle, dans des conditions stables, est d\u00e9termin\u00e9 \u00e0 partir de l\u2019\u00e9quilibre entre la t\u00eate motrice … 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":"\nQu'est-ce que la force de r\u00e9sistance hydraulique - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Force de r\u00e9sistance hydraulique. 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