This experimental study examines the impact of ultrasonic vibration on pressure drop and heat transfer enhancement of inlet turbulent flows. A stainless steel tube connected to an ultrasonic transducer and immersed in a constant temperature two-phase fluid was considered as the test section. Regarding the designed configuration, the ultrasonic transducer utilized had an acoustic frequency of 28 kHz and two different power levels of 75 W and 100 W. The experiments were conducted for different ultrasonic power levels, inlet temperatures, and flow rates. The accuracy of measurements was successfully validated via the existing empirical correlations. The results indicate that the effect of ultrasonic vibration on pressure drop and heat transfer enhancement diminishes with the growth of both Reynolds number and inlet temperature. Based on previously reported results on inlet flows with a laminar flow regime, the effect of ultrasonic vibration is very trivial in current turbulent inlet flows (up to 7.28% for heat convection enhancement). The results of the present study will be beneficial for future investigations on designing vibrating heat exchangers.

这项实验研究检验了超声振动对入口湍流的压降和传热增强的影响。将连接到超声换能器并浸入恒温两相流体中的不锈钢管视为测试部分。关于设计的配置，所使用的超声换能器具有28 kHz的声频和75 W和100 W的两个不同功率水平。针对不同的超声功率水平，入口温度和流速进行了实验。通过现有的经验相关性，成功地验证了测量的准确性。结果表明，超声振动对压降和传热增强的影响随着雷诺数和入口温度的增加而减小。根据先前报告的层流进气流的结果，在当前湍流进气流中，超声振动的影响微不足道（对于热对流而言，高达7.28％）。本研究的结果将有利于未来设计振动换热器的研究。