An experimental study of heat transfer of a porous channel subjected to oscillating flaw

Experiments have been conducted to study the heat transfer of a porous chan nel subjected to oscillating flow. The surface temperature distributions fo r both steady and oscillating flows were measured. The local and length-ave raged Nusselt numbers were analyzed. The experimental results revealed that the surface temperature distribution for oscillating flow is more uniform that that for steady flow. Due to the reversing flow direction, there are t wo thermal entrance regions for oscillating flow. The length-averaged Nusse lt number for oscillating flow is higher that that for steady flow. The len gth-averaged Nusselt number for both steady and oscillating flows increase linearly with a dimensionless grouping parameter k*/k(f)(D-e/L)(1/2)Pe*(1/2 ). The porous channel heat sink subjected to oscillating flow can be consid ered as an effective method for cooling high-speed electronic devices.