• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >A numerical study of buoyancy-Marangoni convection of volatile binary fluids in confined geometries
【24h】

A numerical study of buoyancy-Marangoni convection of volatile binary fluids in confined geometries

机译：受限几何中挥发性二元流体的浮力-Marangoni对流数值研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A horizontal temperature gradient can cause a flow in a layer of liquid with a free surface via several different mechanisms. The most universal one is due to thermocapillary stresses that arise due to the temperature dependence of surface tension. For binary liquids, the flow can also be driven by solutocapillary stresses that arise due to the dependence of surface tension on the composition of the liquid. For some binary liquids, such as water-alcohol mixtures, solutocapillary stresses are primarily due to phase change (e.g., differential evaporation or condensation of the two components), and these two mechanisms can counteract each other. A recent experimental study (Li and Yoda, 2016) has demonstrated that the flow direction can be reversed by changing the amount of air present inside the experimental apparatus. To understand how the presence of air affects the interfacial stresses, we have developed and implemented numerically a comprehensive two-sided transport model, which accounts for transport of heat, mass, and momentum in both phases and phase change across the interface and is able to reproduce the experimental results. The detailed analysis of these results shows that air tends to suppress phase change and hence solutocapillary stresses. Removing the air enhances phase change, instead suppressing the variation in the interfacial temperature and hence thermocapillary stresses.
机译：水平温度梯度可通过几种不同的机制在具有自由表面的液体层中引起流动。最普遍的原因是由于表面张力的温度依赖性引起的热毛细管应力。对于二元液体，流动也可以由溶质毛细管应力驱动，溶质毛细管应力是由于表面张力对液体成分的依赖性而产生的。对于某些二元液体，例如水与酒精的混合物，溶质毛细应力主要是由于相变（例如，两种组分的差异蒸发或冷凝）引起的，这两种机理可以相互抵消。最近的一项实验研究（Li和Yoda，2016年）表明，可以通过改变实验装置内部的空气量来改变流动方向。为了了解空气的存在如何影响界面应力，我们已经开发并实施了一个数字化的全面的双面传输模型，该模型考虑了热，质量和动量在相和相变两方面在界面上的传递，并且能够重现实验结果。对这些结果的详细分析表明，空气趋向于抑制相变并因此抑制溶解毛细管应力。除去空气会增强相变，而不是抑制界面温度的变化，从而抑制热毛细管应力。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号