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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.
In order to analyze the effect of working fluid on the heat and mass transfer of the system, the film transfer model is dimensionlessly solved and the approximate solution of the total heat transfer in the meniscus thin film region is obtained. The results show that: Capillary evaporation characteristics are very different, of which the ideal evaporation and latent heat of vaporization are the main influencing factors.The ideal evaporation reflects the phase transition mass-transfer capacity of the working fluid, while the latent heat of vaporization affects the phase transition heat transfer capacity.Through the study we can see: Compared with common working fluids such as methanol and pentane, ammonia has good evaporation and transmission characteristics. Therefore, the two-phase transmission system with ammonia working fluid is better than other working fluids with the same temperature range.