外加电场强化苯自然对流和沸腾换热的试验研究

ENHANCEMENT OF ELECTRIC FIELD FOR BENZENE NATURAL CONVECTION AND POOL BOILING HEAT TRANSFER

对沉浸在非极性有机液体工质苯中的平板表面自然对流和沸腾换热的外加电场强化进行了试验,得出了自然对流和沸腾换热的换热系数、强化效果与电场电压、热流密度的关系。试验数据表明外加电场对平板表面苯的自然对流换热和沸腾换热都有一定的强化效果,但外加电场对平板表面苯自然对流换热的强化效果明显好于对沸腾换热的强化效果;且平板表面苯的自然对流换热的强化效果与试验所给定的热流密度无关,而外加电场对平板表面苯的沸腾换热的强化效果随热流密度的增大而减弱。

The electric field enhancement of natural convection and pool boiling heat transfer of benzene on plate surface was investigated. The comparison and analysis for the experimental results were performed. The experimental data indicated that the electric field could enhance the natural convection and pool boiling heat transfer. In the same heat flux, the enhancement affect of the electric field for benzene natural convection heat transfer is larger than the affect for pool boiling heat transfer. For natural convection heat transfer of benzene in plate surface, the enhancement affect of the electric field gradually increases as the voltage rises until 10 kV, when the electric field voltage excess 10 kV, the enhancement affect doesn't continually increases as the voltage rises. The enhancement affect of electric field for benzene natural convection heat transfer doesn't relate to the heat fluxes. For pool boiling heat transfer in the plate surface immersed in the benzene, when the electric field voltage is less than 16 kV, the enhancement affect of electric field for pool boiling gradually increases as the voltage rises at the heat fluxes Q = 5, 6 and 7 kW/m2, the voltage excess 16 kV, the enhancement affect doesn't continually increases as the voltage rises. At the other testing heat fluxes, the enhancement affect of electric field for pool boiling gradually increases as the voltage rises. In the experimental condition, the enhancement magnitude of electric field for pool boiling decreases with increasing heat fluxes.