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在小型换热器中，让少量水在高速空气拖动下进入细小流路，形成气液两相高速流，能够在壁面上形成极薄的水液膜层，液膜层的稳定蒸发换热可以在低壁温或低温差条件下实现稳定的高换热，获得最大换热热负荷．用内径１．６ｍｍ的薄壁不锈钢管作为实验传热管，研究了在细小传热管内水和高速空气两相分层流动时的紊流换热特性，确认这种两相流动具有很高的换热能力，其机理是薄液膜的蒸发换热．实验和理论解析证明，气液两相混合流动是提高小型换热器性能的一种有效途径．
In a small heat exchanger, a small amount of water in the high-speed air drag into the small flow path to form a gas-liquid two-phase high-speed flow, the wall can form a very thin layer of liquid water film, the liquid film stable evaporation heat transfer Can be in the low wall temperature or low temperature conditions to achieve a stable high heat transfer, maximum heat transfer heat load. Using the thin-walled stainless steel tube with an inner diameter of 1.6mm as the experimental heat-transfer tube, the turbulent heat transfer characteristics of the laminar flow of water and high-speed air in the fine heat transfer tube were studied. It was confirmed that the two-phase flow had a high Heat exchange capacity, the mechanism is thin film evaporation heat transfer. Experiments and theoretical analysis prove that the mixed flow of gas and liquid is an effective way to improve the performance of small heat exchangers.