Abstract: The paper deals with evaporation heat transfer in micro/mini size capillary tubes with theoretical analysis and practical calculations. The evaporating meniscus in capillary tubes can be divided into three regions: equilibrium thin film region, transition film region and intrinsic meniscus region. Heat and mass transport occurs on the transition film region and intrinsic meniscus region. The calculation methods for heat transfer performance are given. The results of calculation show that there exist high heat transfer coefficients in the transition film region and the influence of the capillary tube diameter on heat transfer performance mainly depends on the intrinsic meniscus region. The average heat transfer coefficient decreases with increasing diameter of capillary tubes.

摘要： 对微细毛细管内的蒸发传热过程进行了理论分析,提出了其传热性能的计算方法,并作了实例计算.毛细管内的蒸发弯月面可分为平衡稳定液膜区、过渡液膜区和弯月面弯曲区.热质传递过程发生在过渡液膜区和弯月面弯曲区.计算结果表明:在过渡液膜区具有很高的换热系数;毛细管径的增大将导致毛细管内换热系数的下降.