热水型LiBr制冷机中两相流提升管的强化传热研究  

Study on the Heat Transfer Enhancement of Two-Phase Flow Elevation Tube in LiBr Chiller with Hot Water Source

作　　者：张联英[1] 吴裕远[1] 郭金刚[1] 陈东升[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室

出　　处：《西安交通大学学报》2004年第1期6-9,46,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50176036;50276048).

摘　　要：对LiBr溶液在3种不同截面尺寸弦月形通道中的沸腾传热及热虹吸提升过程进行了实验研究,发现在相同的条件下,通道间隙尺寸对传热及溶液提升有直接影响,其中两管直径之比为19∶32的弦月形通道提升管的提升效果最好,溶液的净提升高度可达到稀溶液浸没高度的2.5倍,是目前国内的最大提升高度,同时比现行发生器所需热源温度降低10℃左右;随着热流密度的增大和加热水温度的升高,冷剂水产量和提升管出口气体质量分数均增大;提升管出口处的气体质量分数随着试件浸没深度的增大而减小.Experiments on boiling heat transfer and thermosiphon elevation of LiBr solution inside three lunate channels with different diameters were performed. The experimental results showed that the dimension of the lunate channel had a direct influence on the heat transfer and solution elevation. The elevating tube, whose diameter ratio of two pipes is 19:32, has the best elevation effect among them, and its net elevating height of solution is 2.5 times as high as that of the solution submergence. The elevating height is the highest in China, and at the same time the temperature of the heat source driving the generator is 10°C, which is lower than others. The distilled water yield and vapor fraction at outlet of the elevating tube increase with the heating water temperature and heat flux. The vapor mass fraction at the outlet of the elevating tube increases with the decrease of the driving liquid head.

关 键 词：溴化锂制冷机 两相流 提升管 弦月形通道 

分 类 号：TK124[动力工程及工程热物理—工程热物理]