Abstract
In view of energy saving technology, large-sized energy saving system of heat pipe has been gradually emphasized. There for, facing vertical large-scaled heat pipe must be an indispensable, unstoppable duty. The performance of heat pipe is not only controlled by geometry parameters, but also tube thickness, material, property of working fluid including latent heat, vapor pressure, viscosity, pressure and the degree of vacuum. The main theme of this article is to discuss the causes to the max heat transfer of thermal syphon vertical heat pipe. Including filling ratio, inside structure, and porous. Operate a thermo testing system to test the max heat transfer of heat pipe under different temperature conditions. These experimental information will be discussed with simulation data, which we can comparatively find out a better resolution. Through the repeating experiment, we can not only found out that most of the deviation values between simulation and experimentation are under 10%, but also perfectly predict the trend of the Q-max. The experimentation shows when filling ratio is at 11.77% inside our self-made copper tube, we will have the best max heat transfer 240W, way higher than the industry, which is 180W. In order to cut the cost down, we developed 16pin aluminum-pipe, also had a great max heat transfer 210W under 30% filling ratio. Under the final result of experiment and simulation, porous does not improve the max heat flux, it will cause a resistance force to the two phase flow.