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Pertes de charge linéiques formule de poiseuille
1.
10/7/2015 Pertes de charge linéiques Formule de Poiseuille http://public.iutenligne.net/mecanique/mecaniquedesfluides/courtin/pertesdechargelineique/co/Pertes%20de%20charges%20lineiques_19.html 1/2 contenu menu navigation pied de page Pertes de charge linéiques défilement haut Objectifs Quelques définitions Objectifs pédagogiques Contexte scientifique Contexte technique Prérequis Écoulement en chargev Introduction La rugosité relative La viscosité Nombre de Reynolds Perte de charge linéique Formule de Poiseuille Formule de Colebrook Formule de Flamant Écoulement gravitaire> Exercices> Autoformation Bases Autoévaluation Formules Autoévaluation Calculs défilement bas Masquer le plan
Masquer le plan Afficher le plan Afficher le plan Formule de Poiseuille Origine de l'étude Poiseuille est un médecin français qui s'est intéressé à l'écoulement du sang dans les artères ; celuici est laminaire. Poiseuille a donné son nom à la formule qui permet de déterminer le facteur de perte de charge λ dans le cas des écoulements laminaires.
2.
10/7/2015 Pertes de charge linéiques Formule de Poiseuille http://public.iutenligne.net/mecanique/mecaniquedesfluides/courtin/pertesdechargelineique/co/Pertes%20de%20charges%20lineiques_19.html 2/2 Le
facteur de perte de charge est donc dans ce cas inversement proportionnel au nombre de Reynolds. La perte de charge croît très rapidement lorsque le nombre de Reynolds décroît. Cette formule est applicable pour un nombre de Reynolds inférieur à 2000, lorsque l'écoulement est laminaire et réversible. Définition Formule
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