纳米流体应用于电场强化传热的试验研究  

Experimental study of heat transfer enhancement in electric field with nanometer fluid

作　　者：刘幼幼[1] 郁鸿凌[1] 董伟[1] 李瑞阳[1] 

机构地区：[1]上海理工大学动力工程学院,上海200093

出　　处：《上海理工大学学报》2008年第5期439-442,共4页Journal of University of Shanghai For Science and Technology

基　　金：上海市科技委员会青年科技启明星计划资助项目(06AQ14035)

摘　　要：通过在电场强化换热技术基础上应用纳米颗粒技术,向换热工质纯变压器油中添加不同浓度的纳米颗粒,在同一热流密度、不同电场电压下进行试验,发现在试验范围内,当施加电压达到44 kV时,达到最大换热系数270.3 W/(m2.K),与纯变压器油电场强化自然对流换热相比,其最大强化系数为2.49.强化机理归结于颗粒受电场力作用在流体中产生的扰动所致.The nanometer pellet technology was applied in the heat transtfer enhancement under the action of electric field. Adding nanometer pellets with different density into the heat transfer working medium the pure transformer oil, with constant heat flow density and under different electric field voltage, the experiments were carried out to find the maximal heat exchange coefficient. It is found, in the experiment range, when the applied voltage reaches 44 kV, the maximal heat exchange coefficient, 270.3 W/（m· K）,will be achieved. Comparing with the natural convection heat transfer under electric field with pure transformer oil as medium, the strengthening effect is greatly improved and the maximal strengthening coefficient can be attained to 2.49. The strengthening behavior is attributed to the pellet perturbation in fluid induced by electric field forces.

关 键 词：强化传热 电场 纳米流体 

分 类 号：TK124[动力工程及工程热物理—工程热物理]