期刊名称：Eastern-European Journal of Enterprise Technologies
印刷版ISSN：1729-3774
电子版ISSN：1729-4061
出版年度：2021
卷号：5
期号：5
页码：6-13
DOI：10.15587/1729-4061.2021.241694
语种：English
出版社：PC Technology Center
摘要：The paper discusses the combined methods of increasing heat transfer, effects of adding nanofluids and ultrasonic vibration in the radiator using radiator coolant (RC) as a base fluid. The aim of the study is to determine the effect of nanoparticles in fluids (nanofluid) and ultrasonic vibration on the overall heat transfer coefficient in the radiator. Aluminum oxide nanoparticles of 20–50?nm in size produced by Zhejiang Ultrafine powderandChemical Co, Ltd China were used, and the volume concentration of the nanoparticles varied from 0.25?%, 0.30?% and 0.35?%. By adjusting the fluid flow temperature of the radiator from 60?°C to 80?°C, the fluid flow rate varies from 7 to 11?lpm. The results showed that the addition of nanoparticles and ultrasonic vibration to the radiator coolant increases the overall heat transfer coefficient by 62.7?% at a flow rate of 10 liter per minute and temperature of 80?°C for 0.30?% particles volume concentration compared to pure RC without vibration. The effect of ultrasonic vibration on pure radiator coolant without vibration increases the overall heat transfer coefficient by 9.8?% from 385.3?W/m2·°C to 423.3?W/m2·°C at a flow rate of 9?liter per minute at a temperature of 70?°C. The presence of particles in the cooling fluid improves the overall heat transfer coefficient due to the effect of ultrasonic vibrations, nanofluids with a volume concentration of 0.25?% and 0.30?% increased about 10.1?% and 15.7?%, respectively, compared to no vibration. While, the effect of nanoparticles on pure radiator coolant at 70?°C enhanced the overall heat transfer coefficient by about 39.6?% at a particle volume concentration of 0.35?% compared to RC, which is 390.4?W/m2·°C to 545.1?W/m2·°C at 70?°C at a flow rate of 10 liter per minute.
关键词：nanofluid;aluminum oxide;radiator coolant;ultrasonic vibration;overall heat transfer coefficient
