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首页> 外文期刊>International Journal of Heat and Mass Transfer >Horizontal convection driven by nonuniform radiative heating in liquids with different surface behavior
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Horizontal convection driven by nonuniform radiative heating in liquids with different surface behavior

机译：在不同表面行为的液体中由非均匀辐射加热驱动的水平对流

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摘要

Horizontal convection development in liquids with free surface nonuniformly heated by infrared radiation is investigated. Experimental measurements of velocity and temperature fields are performed by Particle Image Velocimetry (PIV) and Background Oriented Schlieren (BOS). Absence of Marangoni convection in distilled water due to presence of surface film leads to significant difference between the results obtained in distilled water and in ethanol. Strong Marangoni flow in ethanol results in quick dispersion of heat over the surface layer and acceleration of convective flow. In distilled water heat propagation along the surface is inhibited, because only weak secondary flow associated with 3D effects is observed at the surface. Experimental results are compared to numerical simulations with different boundary conditions for horizontal velocity at the free surface: no-slip condition for distilled water, representing stagnant surface film, and tangential-stress condition, taking into account Marangoni effect, for ethanol. Good agreement is obtained, demonstrating of prescribing appropriate boundary condition, which corresponds to surface behavior of the considered liquid. (C) 2018 Elsevier Ltd. All rights reserved.
机译：研究了自由表面非均匀地被红外辐射加热的液体中的水平对流发展。速度和温度场的实验测量是通过粒子图像测速（PIV）和背景定向Schlieren（BOS）进行的。由于存在表面膜，在蒸馏水中不存在Marangoni对流会导致在蒸馏水和乙醇中获得的结果之间存在显着差异。乙醇中强烈的Marangoni流动导致热量在表层快速分散并加速对流流动。在蒸馏水中，沿表面的热传播受到抑制，因为在表面仅观察到与3D效果相关的次要流动。将实验结果与在自由表面水平速度的不同边界条件下的数值模拟进行了比较：蒸馏水的无滑移条件（代表停滞的表面膜）和切向应力条件（考虑到Marangoni效应）对于乙醇。获得了良好的一致性，表明规定了适当的边界条件，该条件对应于所考虑液体的表面行为。 （C）2018 Elsevier Ltd.保留所有权利。

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