工质对毛细管内延展弯月面蒸发传热的影响

为分析工质对系统传热传质的影响，对薄膜传输模型进行了无量纲化求解，获得了弯月面薄膜区蒸发总传热量的近似解.结果表明：同样工况下不同工质的毛细蒸发特性有很大差别，其中理想蒸发量和汽化潜热是主要影响因素.理想蒸发量反映了工质的相变传质能力，而汽化潜热则影响其相变传热能力.通过研究可知：相比甲醇、戊烷等常用工质，氨具有较好的蒸发传输特性，因此采用氨工质的两相传输系统在性能上优于同温度范围其他工质.

Effect of working fluid on heat transfer of evaporating extended meniscus in capillary channel

To make a better understanding of the influence of working fluid on system,an approximate analytic solution of integral evaporating heat transfer in the thin film region of meniscus was obtained by solving the mathematic model of heat and mass transfer of thin film.According to the analysis,heat and mass transfer characteristic of an evaporation meniscus for different working fluids differed a lot even in the same working condition.Among all physical parameters,the influences of the ideal evaporation mass and the latent heat were dramatic.The ideal evaporation mass can reflect the mass transfer capability of the working fluid,and the latent heat can reflect the heat transfer capability of the working fluid.Through the present work,it's learnt that system with ammonia has better transfer capability than that with methanol or pentane.