溴化锂溶液真空表面蒸发实验研究

以质量浓度为0—15％溴化锂溶液为“工质”，研究操作温度在40～70℃条件下溶液真空表面蒸发过程。实验结果表明：溴化锂溶液的蒸发速率随溶液浓度的增大而减小，但随溶液温度的升高而增大；该实验条件下获得的对流传热系数值在700～1400W·m-2·℃-1范围内，且随溶液浓度增大而显著减小。这主要是由于溶液浓度增大使得其粘度显著增加，导致热阻增大所致。

Experimental Study on the Vacuum Surface Evaporation of the LiBr Solution

With the mass concentration ranged from 0 to 15% and temperature from 40℃ to 70 ℃, the vacuum surface evaporation process of the LiBr solution was studied. The experiment results showed that： the evaporation rate of the LiBr solution declined with the rise of the solution concentration, however, increased with the rise of the solution temperature. The heat transfer coefficient obtained under the experiment conditions ranged from 700 W · m-2 ·℃ to 1400 W·m-2·℃-1, and decreased significantly with the increasing of the solution concentration. It was caused by the enhancement of heat transfer resistance due to the elevated viscosity which resulted from the increased solution concentration.