微槽道中纳米流体沸腾换热特性研究  

Boiling heat transfer characteristics of nano-fluid in micro-channel

作　　者：王维[1] 罗小平[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510640

出　　处：《低温与超导》2011年第4期65-69,共5页Cryogenics and Superconductivity

基　　金：国家自然科学基金资助项目(20676039)

摘　　要：为研究纳米流体在微槽道中的沸腾换热特性及规律,分别以去离子水和体积浓度为0.2%、0.5%的水基A l2O3纳米流体为工质进行试验,研究质量流速、热流密度、进口过冷度、槽道尺寸等因素对沸腾传热系数的影响及其两相摩擦压降与出口干度的关联分析和沸腾换热关联式对比拟合。试验结果表明:在一定热流密度和质量流速下,传热系数随槽道尺寸的减小而增大;质量流速和进口过冷度对水基A l2O3纳米流体和去离子水的传热系数均无明显的影响。研究表明,在本实验的给定条件下,水基A l2O3纳米流体相对于去离子水可以明显强化微槽道沸腾换热特性,传热系数可提高10%-15%。For the application of nano-fluid in the field of heat transfer in micro passages,experiments were carried out at the atmospheric pressure to discuss the heat transfer characteristics of nano-fluid compaired with deionized water and the mechanism of nano-fluid in micro scale heat transfer.The thesis was mainly about the change of boiling heat transfer coefficient with different heat flux,mass velocity,inlet subcoolings and so on.The working mediums were deionized water and the water based on Al2O3 nano-fluids with concentrations of 0.2% and 0.5%.Results show that in a designed heat flux and mass flow rate,the boiling heat transfer coefficient increases with the decreasing of the diameters of channels,it increases with the increasing of heat flux,and it was not significantly affected by mass flux and under-cooling imports.The study confirms that the boiling heat transfer characteristics of micro channel can be evidently enhanced by 7%-12% for the experiment using water/Al2O3 nano-fluid.

关 键 词：纳米流体 微槽道 沸腾传热系数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]