Natural convection and radiation heat transfer in a vertical porous layer with a hexagonal honeycomb core (1st Report, Numerical analysis)

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Combined heat transfer characteristics are obtained numerically for three-dimensional natural convection and thermal radiation in a long and wide vertical porous layer with a hexagonal honeycomb core. The porous layer is assumed to be both homogeneous and isotropic. The pure Darcy law for the fluid flow and Rosseland's approximation for the radiation are employed. The numerical methodology is based on an algebraic coordinate transformation technique and the transformed governing equations are solved using the SIMPLE algorithm. The effect of radiation on the heat transfer characteristics is investigated in a wide range of radiation numbers and temperature ratios, for two Darcy-Rayleigh number values (Ra* = 100, 1 000), and for a fixed aspect ratio of H/L = 1. The results are presented in the form of combined and convection heat transfer coefficients, and are compared with the corresponding values for pure natural convection.

Publication Title, e.g., Journal

Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B