Thermal dispersion in a porous medium

A simple and coherent set of coefficients for modelling of heat and mass transport with and without chemical reaction in tubes filled with spheres

A study of non-Darcian forced convection in an asymmetric heating sintered porous channel is carried out to investigate the feasibility of using this channel as a heat sink for high-performance forced air cooling in microelectronics. A volume-averaging technique is applied to obtain the macroscopic equations with the non-Darcian effects of no-slip boundary, flow inertia, and thermal dispersion. Local non-thermal-equilibrium is assumed between the solid and the fluid phases. The analysis reveals that the particle Reynolds number significantly affects the solid-to-fluid heat transfer coefficients. A wall function is introduced to model the transverse thermal dispersion process for the wall effect on the lateral mixing of fluid. The local heat transfer coefficient at the inlet is modeled by a modified impinging jet result, and the noninsulated thermal condition is considered at exit. The numerical results are found to be in good agreement with the experimental results in the ranges of 32 ≤ Red ≤ 428 and q = 0.8 ~ 3.2 W/cm2 for Pr = 0.71.

Investigation of Non-Darcian Forced Convection in an Asymmetrically Heated Sintered Porous Channel

https://ir.nctu.edu.tw/bitstream/11536/1185/1/A1996UF40200014.pdf

C.T. Hsu

Papers

Applications of Van Driest's mixing length theory to transverse thermal dispersion in forced convective flow through a packed bed