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

Author(s) : MARANZANA G., PERRY I., MAILLET D.

Type of article: Article

Summary

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.

Details

  • Original title: Mini- and micro-channels: influence of axial conduction in the walls.
  • Record ID : 2005-0597
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 47 - n. 17-18
  • Publication date: 2004/08

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