Analysis of counter-flow convective exchangers using general Graetz modes

Abstract eng:
We perform a systematic analysis of heat transfer in a counter-current three dimensional convective exchanger, when the inlet/outlet influence is fully taken into account as is the longitudinal diffusion in the exchanger and the inlet/outlet tubes. The analysis, carried out for constant fluid properties and using generalized Graetz mode decomposition consider the various influence of the fluid/solid diffusivity, the imposed convection, inlet/outlet far-field conditions, and lateral boundary conditions. In all cases we found an optimal P´eclet number for the cold or hot efficiency. This study open new perspectives for micro-heat exchangers where moderate convection provides the best efficiency and compactness.

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