Abstract: Vapor-liquid two phase flow is widely used in heat exchanger. Through the analysis of the heat transfer process and flow pattern of refrigerant in the tube, it is found that during the condensation process, the heat transfer coefficient in the tube is the highest when the liquid droplet is just generated, while during the evaporation process, the heat transfer coefficient in the annular flow is the highest. In order to achieve rapid liquid removal during the condensation process, a vapor-liquid separation technology that enhances heat transfer by thinning the liquid film has been proposed, which has attracted extensive research and application in recent years. Innovatively proposes a honeycomb vapor-liquid separation structure which can be applied to finned tube heat exchangers, simulation software is used to study the vapor-liquid separation process mechanism of the honeycomb separation structure. At the same time, the empirical formulas in Coildesigner are used to verify its accuracy and reliability, and the parameters of the honeycomb vapor-liquid separation structure are ultimately determined, which can achieve vapor-liquid separation efficiency of over 89%. At the same time, a finned tube heat exchanger equipped with a honeycomb gas-liquid separation structure can achieve a pressure drop loss reduction of 8.08% and a heat transfer increase of 6.22% compared to traditional finned tube heat exchangers.

Key words: Vapor-liquid separation, Micropore, High efficiency heat exchanger, Finned tube heat exchanger, Thinning liquid film