螺纹管强化降液膜流动时的传质传热及其应用

本文对液体沿带有不同螺距的螺纹表面呈降膜流动时,液膜和固体管壁之间的液-固传质、液膜与管壁之间的传热、以及液膜和膜外的气体之间的气-液传质进行了研究。和流体流过光滑管表面的试验结果相比较,表明螺纹表面对降膜流动中的传递过程产生明显的强化作用,得到相应的关联式。并列出了在降膜流动设备中进行的伴有强放热效应的化学吸收过程的质量和热量传递的数学模型,由此对螺纹管应用于类似过程的实际效果进行了估算。

Enhancement of mass and heat transfer of failing liquid film on a spiral grooved tube and its application

The enhancemant of mass and heat transfer in a flow process was investigated. As compared with a smooth surface, the coefficient of liquidsolid mass transfer from the falling liquid film to the tube wall, the heat transfer coefficient were increased by 5—7 times, 2.4—3.7 times and 1.25—1.60 times respectively. Absorption of NH_3 in aqua solution was taken as an example for the absorption process with high heat effect, using a spiral grooved surface in stead of a smooth surface. The absorption capability of the tube was increased by 155—160% and at the same time, the amount of cooling water was saved by 150— 150%.