Numerical simulation of bubble dynamics under multi-ultrasonic vibrators

被引：0

作者：

Hou Z. ^{[1
]}

Wang L. ^{[1
]}

Yan X. ^{[2
]}

Li X. ^{[1
]}

Wang Z. ^{[1
]}

Liang K. ^{[1
]}

机构：

[1] Institute of Building Energy and Thermal Science, Henan University of Science and Technology, Luoyang

[2] School of Landscape Architecture, Zhejiang A & F University, Hangzhou

来源：

Huagong Xuebao/CIESC Journal | 2021年 / 72卷

关键词：

Bubble dynamics; Lithium bromide aqueous solution; Multi-frequency ultrasound; Numerical simulation; Ultrasonic cavitation;

D O I：

10.11949/0438-1157.20201498

中图分类号：

学科分类号：

摘要：

Ultrasound plays an important significance in enhancing the boiling heat-transfer of lithium bromide aqueous solution in the generator of absorption refrigeration system, there are few theoretical and experimental studies about the application of ultrasound heat-transfer enhancement technology in the boiling heat-transfer of lithium bromide aqueous solution in the generator, especially in the field of solution bubble dynamics with multi-ultrasonic vibrators at present. In order to investigate the influence of the quantities of ultrasonic vibrators on the characteristics of solution cavitation bubble dynamics, a mathematical model of lithium bromide aqueous solution bubble dynamics is constructed, in addition, the accuracy of the mathematical model is verified with the degassed water, and the effect of different influencing factors on the characteristics of solution cavitation bubble dynamics are discussed. The results indicate that, when the total sound intensity of 1 W/cm2, as the quantities of ultrasonic vibrators rise from 1 to 5, the maximum radius of a cavitation bubble is increased by 44.12%, while the maximum radius of cavitation bubble is increased by no more than 1% at the quantities of ultrasonic vibrators of 24—25; The effect of the generating pressure (ambient pressure) on the solution cavitation effect would be increased with the quantities of ultrasonic vibrators increase, in the absorption refrigeration system, the lithium bromide aqueous solution in vacuum generator is more likely to produce steady cavitation process with the single-ultrasonic vibrator, nevertheless, the solution in vacuum generator is more likely to produce transient cavitation process with the multi-ultrasonic vibrators; when the ultrasonic frequency uniformities of ultrasonic vibrators decrease, the intensity of solution cavitation effect would be increased, while the ultrasonic intensity uniformities of ultrasonic vibrators on the intensity of solution cavitation effect could be neglected. © 2021, Editorial Board of CIESC Journal. All right reserved.

引用

页码：362 / 370

页数：8

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