| 吴寒旭,朱发兴,赵可,蒋彦龙,董月,黄博阳,罗家琪.双液滴同时撞击液膜流动及换热过程数值模拟[J].计算力学学报,2024,41(5):963~969 |
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| 双液滴同时撞击液膜流动及换热过程数值模拟 |
| Numerical simulation of flow and heat transfer process of double droplets simultaneously impacting on flat liquid film |
| 投稿时间：2023-04-20 修订日期：2023-05-20 |
| DOI：10.7511/jslx20230420003 |
| 中文关键词: 双液滴 CLSVOF 液膜 中心射流 换热 |
| 英文关键词:double droplets CLSVOF liquid film central jet heat transfer |
| 基金项目:江苏省研究生科研与实践创新计划(KYCX21_0227);高空消耗式相变换热技术研究项目(1001-KFA20680)资助. |
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| 中文摘要: |
| 液滴撞击液膜对换热特性及液膜形态变化具有较大影响,对其研究有助于提高机载喷雾冷却性能,促进航空工业应用与发展。采用CLSVOF方法模拟了双液滴同时撞击液膜的现象,在不同液膜厚度、液滴水平间距和重力加速度工况下,研究了液膜形态演变过程及特性,探索了双液滴撞击液膜后中心射流的发展规律,分析总结了液膜与高温壁面的换热特性。结果表明,液膜厚度越大,中心射流上升速度越慢,射流发生断裂时刻越晚,撞击后产生的液膜回缩对壁面换热影响较大;液滴水平间距越大,中心射流上升速度越慢,增大液滴间距不改变壁面热流密度变化的趋势;重力加速度越大,中心射流上升速度越慢,射流发生断裂时刻越早,重力加速度对壁面换热影响较小。 |
| 英文摘要: |
| The study of droplet impact on a liquid film is conducive to foster the performance of airborne spray cooling and boost the application and development of the aviation industry,based on its considerable influence on heat transfer and morphological changes of liquid film.On the premise of different thicknesses of a liquid film,horizontal distances of double droplets and gravity accelerations,the research focuses on the evolution process and characteristics of liquid film morphology,explores the development law of the central jet after the double droplets impact on the liquid film,and analyzes the heat transfer characteristics of the liquid film and the high-temperature wall,with a rollout of simulating the simultaneous impact of double droplets on the liquid film using CLSVOF method.The results show that the thicker the liquid film is,the more slowly the central jet rises,the later the jet breaks,and the liquid film retraction has a significant impact on wall heat transfer.The larger the horizontal distance between the two droplets is,the more slowly the central jet rise,increasing the distance does not change the trend of changes in wall heat flux.And the greater the gravity acceleration is,the more slowly the central jet rises,the earlier the jet breaks,and the effect of gravitational acceleration on wall heat transfer is relatively small. |
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