Heat dissipation mechanism of narrow gap vertical channels with porous media

This study mathematically employs theoretical deduction methods to solve the analytic solutions of velocity and temperature. It also investigates the effect of the aspect ratio of the narrow gap vertical channel filled with porous media and porosity through simulation. Particularly, to clearly explore the comprehensive influence law of these parameters, we extensively discussed quantitative relationship by fitting between flow resistance, heat transfer coefficient, exergy and channel aspect ratio, porosity, Reynolds number based on equivalent diameter. The relative errors between simulation and fitting results about resistance coefficient, f, and Nusselt number are almost within ?10%. For this study, the exergy critical Reynolds number is 2147.5. When aspect ratio is 0.1, the convective heat transfer coefficient reaches its maximum. Besides, to verify correctness of the calculation and simulation, we built the experimental platform and measured temperature and velocity in narrow gap vertical channel filling copper foam with different porosity. The uniqueness of this study lies in resolving the heat dissipation mechanism of the narrow gap vertical channel filled with porous media, which has not been at-tempted before. This work provides insights into the flow and heat transfer mechanism of such channels and helps improve the performance and lifespan of high-power electronic devices.