The precipitation of nanoparticles is one of the most important barriers in the industrial application of nanofluids. The common method for stabilizing nanofluids is imposing ultrasonic waves on the nanofluid before using it in the heat exchangers. The problem with this method is that after a short time, the nanoparticles start to settle. In this study, the effect of using a novel heat exchanger equipped with ultrasonic transducers on increasing the stability and heat transfer coefficient of exchanger is investigated. The results indicated that using ultrasonic transducers has increased the heat transfer coefficient as well as increasing the stability of nanofluids. The effect of ultrasonic waves on the heat transfer coefficient increased with increasing the concentration of nanofluid but reduced with increasing the flow rate. In the range covered by these results, the simultaneous use of nanofluid and ultrasonic waves could increase the heat transfer coefficient by 300%.

纳米粒子的沉淀是纳米流体工业应用中最重要的障碍之一。稳定纳米流体的常用方法是在纳米流体用于热交换器之前对其施加超声波。这种方法的问题在于，在很短的时间后，纳米颗粒开始沉降。在这项研究中，研究了使用配备超声波换能器的新型换热器对提高换热器稳定性和传热系数的影响。结果表明，使用超声换能器提高了传热系数并增加了纳米流体的稳定性。超声波对传热系数的影响随着纳米流体浓度的增加而增加，但随着流速的增加而减小。