Abstract: The film thickness distribution and average thickness outside a horizontal test tube were measured by using film-thickness meter.The effects of liquid load，evaporation boiling point，temperature difference and tube diameter on the film thickness，the waving intensity and，as a result，the heat-transfer film coefficients outside the horizontal-tube were determined experimentally.Experiments of the heat-transfer coefficient of horizontal-tube evaporation were conducted with various operation parameters.Equations of evaporation heat-transfer coefficient were set up by regression of experimental data.These results provide a basis for further developing high efficiency heat-transfer process and novel evaporators.

Key words:

传热, 液膜测量, 水平管, 降膜蒸发, 海水淡化

摘要： 采用智能化薄膜厚度测试仪实验研究了液体负荷、蒸发侧沸点、传热总温差和传热管管径等因素对水平光滑传热管外液膜厚度、波动状况以及因此而导致的蒸发侧传热膜系数的影响，得到了传热膜系数的关系式，突出了液膜波动的影响.还讨论了多种操作参数对两侧传热膜系数和总传热系数的影响，为工业设计提供实验依据.

关键词:

传热, 液膜测量, 水平管, 降膜蒸发, 海水淡化