不同振动条件下水平冷表面上液滴冻结过程数值模拟  

Numerical simulation of droplet freezing process on horizontal cold surface under different vibration conditions

作　　者：陈清华[1,2,3] 盛恩 张斌 季家东[1] 王建刚 刘萍 CHEN Qinghua;SHENG En;ZHANG Bin;JI Jiadong;WANG Jiangang;LIU Ping(Anhui Provincial Key Lab of Mine Intelligent Equipment and Technology,Anhui University of Science and Technology,Huainan 232001,China;Research Institute of Environment-friendly Materials and Professional Health,Anhui University of Science and Technology,Wuhu 241003,China;Guangdong Lijia Industrial Co.,Ltd.,Dongguan 523000,China)

机构地区：[1]安徽理工大学矿山智能装备与技术安徽省重点实验室,安徽淮南232001 [2]安徽理工大学环境友好材料与职业健康研究院(芜湖),安徽芜湖241003 [3]广东立佳实业有限公司,广东东莞523000

出　　处：《振动与冲击》2024年第23期86-93,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(52175070);安徽理工大学环境友好材料与职业健康研究院研发专项基金资助项目(ALW2021YF12);安徽省重点研究与开发计划项目(2022a05020030)。

摘　　要：液滴冻结作为结霜初期霜层生长的初始开端,对后续霜层生长发挥着关键作用。为研究液滴在振动条件下的冻结规律,通过对水平冷表面添加正弦周期性振动条件进行数值模拟分析,并搭建试验平台进行验证。研究结果发现:振动条件改变了固液相界面形态,缩短了液滴完全冻结时间,其中改变振动频率和振动幅值均会加快液滴冻结;液滴冻结前期,受凝固放热和固相成长影响,测点温度变化呈现先慢后快再趋于平缓的趋势,测点温度平均变化速率与振动频率和振动幅值成正比;液滴冻结过程中,相界面波动程度主要受振动幅值和液滴大小影响,体积恒定时,振动幅值越大,相界面波动程度越明显,相同振动条件下,液滴体积越小,相界面波动程度越明显。Freezing of liquid droplets,as the initial beginning of frost layer growth in initial stage of frosting,plays a crucial role in subsequent growth of frost layers.Here,to study freezing laws of liquid droplets under vibration conditions,numerical simulation analysis was performed by adding sinusoidal periodic vibration conditions to a horizontal cold surface,and an experimental platform was built for verification.The study results showed that vibration conditions change the morphology of solid-liquid interface and shorten the complete freezing time of droplets,changing vibration frequency and amplitude can both accelerate droplet freezing;in early stage of droplet freezing,due to effects of solidification heat release and solid phase growth,temperature changes at measured points exhibit a trend of firstly slow,then fast and then tending to be gentle,the average rate of temperature change at measured points is proportional to vibration frequency and amplitude;in freezing process of liquid droplets,the degree of phase interface fluctuation is mainly affected by vibration amplitude and droplet size,when droplet volume is constant,the larger the vibration amplitude,the more obvious the phase interface fluctuation;under the same vibration conditions,the smaller the droplet volume,the more obvious the phase interface fluctuation.

关 键 词：液滴冻结 振动条件 水平冷表面 相界面变化 数值模拟 

分 类 号：TB657.5[一般工业技术—制冷工程]