超声作用下流动液膜在流道中传热的实验分析

Experimental analysis of heat transfer in the channel with a flowing liquid film subjected to the ultrasound

受超声作用的流动液膜流过具有热源的流道底部来强化传热,以降低壁面的温度。通过实验方法来分析在不同的工况下受超声作用的流动液膜对加热壁面温度和传热系数的影响。实验结果表明,以45°倾斜角放置的超声波以及较大的液膜流速和超声波的耦合可获得较低的壁面温度和较高的换热系数。同时,在较低的热流密度下,顺流对液膜传热的影响大于逆流,随着热流密度的逐渐增大,顺流对液膜传热的影响减弱。此外,两个超声波对液膜的共同作用可获得96%的换热系数上升速率。基于实验结果,得到了两个超声波比单个超声波能产生更多对流的结论。该研究对设备降温有参考价值。

Flowing liquid film subjected to ultrasound flows through the bottom of the channel with heat source to enhance heat transfer and reduce wall temperature. In this paper, the influence of the flow liquid film under the action of ultrasound on the heating surface temperature and heat transfer coefficient was analyzed by experimental method. The experimental results show that the lower wall temperature and the higher heat transfer coefficient can be obtained in the mode with the ultrasound placement at 45°inclination angle, the larger liquid film flow velocity and ultrasound wave coupling. Meanwhile, at a lower heat flux, the downstream flow has a greater influence on the heat transfer of the liquid film than the counter flow. With the increase of heat flux, the downstream flow has a weaker influence on the heat transfer of the liquid film. Besides, the combined action of two ultrasound waves on the liquid film can obtain 96% heat transfer coefficient rise rate. Based on the experimental results, it is concluded that two ultrasound waves can produce more convection than a single ultrasound wave. This study can provide valuable reference for equipment cooling.