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首页> 外文会议>Proceedings of the ASME microanoscale heat and mass transfer international conference 2012 : Microanofluidics and Lab-on-a-chip .... >CONVECTION, EVAPORATION, AND CONDENSATION OF SIMPLE AND BINARY FLUIDS IN CONFINED GEOMETRIES
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CONVECTION, EVAPORATION, AND CONDENSATION OF SIMPLE AND BINARY FLUIDS IN CONFINED GEOMETRIES

机译：约束几何中简单和二元流体的对流，蒸发和冷凝

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摘要

Rayleigh-Benard and Marangoni convection in a layer of a homogeneous fluid with a free surface in the absence of phase change is a classic (and extensively studied) problem of fluid mechanics. Phase change has a major effect on the convection problem. Most notably, significant latent heat generated at the free surface as a result of phase change can dramatically alter the interfacial temperature, and hence, the thermocapillary stresses. Furthermore, differential evaporation in binary fluids can lead to considerable variation in the concentration field, producing solutocapillarity stresses, which can compete with thermocapillarity and buoyancy. This talk describes numerical studies of convection in alcohol and alcohol-water mixtures due to a horizontal temperature gradient in the presence of phase change. We illustrate how the composition of the liquid and the presence of non-condensable gases (e.g., air) can be used to alter the balance of the dominant forces. In particular, by adding or removing air from the test cell, the direction of the flow can be reversed by emphasizing either the thermocapillary or the solutocapillary stresses.
机译：在没有相变的情况下，具有自由表面的均匀流体层中的Rayleigh-Benard和Marangoni对流是流体力学的经典（广泛研究）问题。相变对对流问题有重大影响。最值得注意的是，由于相变而在自由表面上产生的大量潜热会极大地改变界面温度，从而改变热毛细管应力。此外，二元流体中的差异蒸发会导致浓度场发生相当大的变化，从而产生溶质松散应力，从而可以与热毛细作用和浮力竞争。本演讲描述了由于相变存在时水平温度梯度导致的醇和醇-水混合物中对流的数值研究。我们说明了如何使用液体的成分和不可凝气体（例如空气）的存在来改变主导力的平衡。特别地，通过从测试单元添加或去除空气，可以通过强调热毛细应力或溶毛细血管应力来反转流动方向。

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