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COUPLED CONDUCTION AND CONVECTION IN COOLANT PASSAGES WITH ARRAYS OF PIN FIN

DOI: 10.1615/ICHMT.2008.CHT.1040
13 pages

Gianni Comini
CISM

Giulio Croce
DiEM - Dipartimento di Energetica e Macchine, Università di Udine, Via delle Scienze 208, 33100 Udine, Italy

Paola D'Agaro
DiEM - Dipartimento di Energetica e Macchine, Università di Udine, Via delle Scienze 208, 33100 Udine, Italy

Abstract

A numerical analysis of conjugate heat transfer in coolant passages with arrays of pin fins is carried out. Uniform heat flow is applied externally to the base plate of the pins, which is thermally conducting. The base plate itself redistributes the applied heat flux allowing energy flux to concentrate toward the pins. The effect of such a redistribution on convective heat transfer is investigated at different Reynolds numbers and different base plate thicknesses. Most previous literature references use reduced domain, excluding the base plate and applying thermal boundary conditions, either fixed heat flux or fixed temperature, straight on the interface plane between fluid and base plate. Here, such reduced models are compared with the fully conjugate heat transfer solutions. It is shown that, for common high conductive solid materials, the most appropriate boundary condition is a Dirichlet boundary on the temperature. Furthermore, above a thickness threshold value, the convective Nusselt value does not change significantly with the thickness itself.

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