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Mini et microcanaux : influence de la conduction axiale dans les parois.

Mini- and micro-channels: influence of axial conduction in the walls.

Auteurs : MARANZANA G., PERRY I., MAILLET D.

Type d'article : Article

Résumé

Heat transfer by conduction in the walls of mini-micro-channels can get a quite multidimensional character. The wall heat flux density, for small Reynolds numbers, can become strongly non-uniform: most of the flux is transferred to the fluid flow at the entrance of the mini-micro-channel. Two analytical models of channel between parallel plates are proposed. It is shown that inverting experimental measurements using a one-dimensional model, for small flow rates, may lead to an underestimation of heat transfer coefficients. Another conclusion is that axial conduction in the walls of a mini-micro counter-flow heat exchanger yields a loss of efficiency: an optimal wall conductivity that maximises this efficiency exists. A new non-dimensional number quantifying the part of axial conduction in walls is proposed.

Détails

  • Titre original : Mini- and micro-channels: influence of axial conduction in the walls.
  • Identifiant de la fiche : 2005-0597
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 47 - n. 17-18
  • Date d'édition : 08/2004

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