喷水室两相流热质传递研究

Research on two phase flow heat and mass transfer in spray chamber

在动坐标系下对顺流式水-空气热、湿交换处理系统进行研究,确定雾化水滴直径与喷水压力之间的关系曲线,运用相对速度的概念建立喷水室两相流模型及热湿交换第一效率关系式。理论分析与实验数据表明,压力对热湿交换效率关系式影响较大。当喷水压力小于157 Pa时,实验结果与理论值吻合较好,误差小于6%;当喷水压力大于157 Pa时,实验结果与理论值误差较大。在该压力下对热湿交换第一效率关系式进行拟合修正,修正后实验结果与理论值误差在7%以内。

The heat and moisture exchange system through downstream water-air processing in the dynamic coordinate is studied,and the relationship between fogged drop diameter and water jet pressure is determined.By applying the concept of relative speed,a two phase model in the spray chamber and the equation with maximum effectiveness of heat and moisture exchange are established.It has been proved by theoretical analysis and the experimental data that pressure has considerable effect on the equation of heat and moisture exchange.When the hydraulic pressure is less than 157 Pa,experimental results fit well with theoretical results with error less than 6%.When the hydraulic pressure is more than 157 Pa,great error is observed.To reduce this error,corrections are made for the equation with the maximum effectiveness when hydraulic pressure is 157 Pa.After correction,the experimental result is in good agreement with the theoretical value with the error within 7%.