似Hele-Shaw盒中的直接接触式汽化传热及界面形态  

On interfacial shape and heat transfer of direct-contact evaporation in analogous Hele-Shaw cell

作　　者：孙明朗[1] 谢建[1] 王军[1] 沈自求[1] 

机构地区：[1]大连理工大学化学工程系,辽宁大连116012

出　　处：《热科学与技术》2005年第2期95-100,共6页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目 (5 0 1760 0 7);辽宁省自然科学基金资助项目 (2 0 0 42 162)

摘　　要：应用似Hele-Shaw盒的窄缝实验设备,考察了向高黏热液中引入挥发性冷剂进行直接接触汽化传热的过程,获得了糖液的冷却曲线;分析了冷剂通入量和冷剂的入口温度对瞬间主体温度及容积传热速率的影响,并以“界面汽化热阱”效应概念对传热过程进行了分析。同时,研究了冷剂驱替高黏液体时的界面形态,对形成的黏性指进现象进行了图像分析并应用分形理论进行了阐述,获得了界面形态与两液体的黏性比的关系。The process of direct-contact heat transfer between pentane drops which were used as the volatile coolant and a hot sucrose solution in a vertical analogous Hele-Shaw cell was investigated. The cooling curves of hot sucrose solution were obtained. The effects of the flow rate and the inlet temperature of the coolant on the temperature of sucrose solution and volumetric heat transfer coefficient were discussed. The mechanism of the process was analyzed with the concept of ″interfacial vaporization heat sink″. Various interfacial shapes of different systems were also studied when the coolants were evaporated not in an analogous Hele-Shaw cell. Based on the theory of fractal, the effects of viscosity ratio of the two fluids on the interfcial shape and heat transfer were studied by observing the photographs of the interfacial shape of viscous fingering. The cause of the difference and the effects on heat transfer were analyzed.

关 键 词：界面形态 直接接触式 界面汽化热阱 实验设备 冷却曲线 传热速率 入口温度 传热过程 分形理论 图像分析 冷剂 挥发性 应用 液体 

分 类 号：TQ028.8[化学工程] TB332[一般工业技术—材料科学与工程]