长沙理工大学学报（自然科学版）2023，Vol.20Issue(6)：140-148,9.DOI:10.19951/j.cnki.1672-9331.20220413001
基于数值模拟与试验的超声除霜机理研究
Investigation on defrosting mechanism of ultrasonic high frequency resonance based on numerical simulation and experiment
摘要
Abstract
[Purposes]For the ultrasonic defrosting mechanism is unknown in finned-tube evaporators.[Methods]The frosting process and frosting rules on the cold surface is obtained through microscopic visualization method.The theoretical model of ultrasonic defrosting is established on the basis above,and the resonance band of frost crystals and shear stress value excited by ultrasonic vibration is calculated by using the finite element software COMSOL.The maximum adhesion stress of frost crystals is compared calculated results,and the feasibility of ultrasonic high-frequency vibration defrosting technology is theoretically illustrated.Simultaneously,an ultrasonic defrosting experimental bench is constructed on the evaporator of the air-cooled refrigerator,the vibration values of the evaporator under ultrasonic high-frequency vibration are obtained by laser vibrometer,and the actual defrosting effect is compared with the numerical simulation results.Finally,the energy consumption of ultrasonic defrosting is analysed.[Findings]The interfacial stress excited by ultrasonic high-frequency vibration is obviously greater than the adhesion stress between the frost crystal and the cold surface of 0.4 MPa,which significantly reduces the mechanical properties of the frost crystal and makes the frost crystal loose and fall off.The optimal ultrasonic loading mode on the heat exchanger is intermittent loading,and the intermittent time is affected by the ambient temperature and humidity,and the higher the ambient humidity is,the shorter is the intermittent time,and vice versa,the longer is the intermittent time.[Conculusions]The energy consumption of ultrasonic defrosting is about 1/4 of that of traditional thermal defrosting,which has the feasibility of engineering application.关键词
超声除霜/数值模拟/高频振动/COMSOL/除霜机理Key words
ultrasonic defrosting/numerical simulation/high frequency vibration/COMSOL/defrosting mechanism分类
通用工业技术引用本文复制引用
邱尚斌,黄保,谭海辉,王宝福..基于数值模拟与试验的超声除霜机理研究[J].长沙理工大学学报（自然科学版）,2023,20(6):140-148,9.基金项目
广东省青年联合基金项目(2019A1515110007) （2019A1515110007）
中山市社会公益科技研究项目(2019B2067) （2019B2067）
广东省普通高校青年创新人才项目(2018KQNCX331) Youth Joint Fund Project of Guangdong Provincial(2019A1515110007) （2018KQNCX331）
Normal Project of Zhongshan Social Public Welfare Science and Technology(2019B2067) （2019B2067）
Young Innovative Talents Project in General Universities of Guangdong Province(2018KQNCX331) （2018KQNCX331）
