FLUIDE NEWTONIEN PDF

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. In the context of this survey we are confronted to one of the complex situations that are met in the case were the treated physical problem concern two different media which are in mutual influence. We suggest a numerica l resolution by the Crank -Nicolson finite difference methods for resolving the problem relative to an unsteady laminar flow of the Newtonian fluid in presence of an homogeneous cylindrical heated obstacle.

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Quentrec Bernard. Liquides non newtoniens et ordre local. Silicates liquides. In dense fluids the molecules are locally ordered. Taking in consideration this local ordering, we derive fluid dynamical equation for non-Newtonian liquids.

Non-equilibrium thermodynamics and a parameter expressing the extent of local order were used in the formulation of the fluid dynamical problem. These equations can be linearized, when the movements in the fluid are small, for this condition an exact solution is obtained. We used the derived equations to interpret ultrasonic and light scattering data for very viscous liquids. An analysis of plane Couette flow gives a viscosity depending on the shear rate in fair agreement with experimental observations.

Non newtonian liquids and local order. H faut trouver d'autres relations constitutives. Les tenseurs G et I seront introduits plus loin. Il faut maintenant exprimer d s' t , d rrP t , d G t , etc. Ce sont les coefficients de transport. En particulier [20] n'est plus valable. Nous prenons comme exemple un cisaillement de Couette plan stationnaire. On sait que pour un liquide newtonien, la seule composante non nulle du tenseur de contrainte vaut :.

On trouve :. Elles sont en bon accord pour les petites et moyennes valeurs de y. Bezot, P. Molecular physic. Bird, R. De Groot, S. Thermodynamics Editeur North holland. Eldin, G. Journal de physique, 41, Landau, L. Quentrec, B. Journal de physique, lettres, 41, Journal de physique, 37, Molecular Physic. Liquides non newtoniens et ordre local [article] Bernard Quentrec. Plan A.

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