微流道熱交換器流動沸騰熱傳增強研究(II)(1/2)

It is a common design to reduce flow channels size to increase the heat transferarea per unit heat exchanger volume. However for evaporation cooling heatexchangers, if the channels size is smaller than the generating bubble size, it ispossible to cause bubble flow reversal, block the liquid flow and cause partial dryout in the channels. Some researches on preventing the vapor flow reversal havepublished in the past years. But most of them cannot be applied practically owingto their complexity of manufacture, high cost and high pressure drop.This project will design a counter flow two-pass divergent flow passages heatexchanger. Working fluid flows reversely in the adjacent channels with divergentpassages. Another changing angle chevron flow passage heat exchanger will bedesigned as well. It is expected to prevent the vapor flow reversal phenomenonby reducing the downward flow resistance. Micro porous coating will also beapplied on the channel surface to enhance the boiling heat transfer performance.A high heat transfer performance micro-channel heat exchanger will bedeveloped for two-phase evaporation cooling systems.