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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Boiling heat transfer on hydrophilic-hydrophobic mixed surfaces: A 3D lattice Boltzmann study
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Boiling heat transfer on hydrophilic-hydrophobic mixed surfaces: A 3D lattice Boltzmann study

机译：亲水性 - 疏水混合表面的沸腾热传递：3D格子Boltzmann学习

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摘要

In this paper, the boiling heat transfer performance on a type of hydrophilic-hydrophobic mixed surfaces is numerically investigated using a three-dimensional (3D) thermal multiphase lattice Boltzmann model with liquid-vapor phase change. The mixed surface is square-pillar textured with the pillar being composed of hydrophilic side walls and a hydrophobic top surface. Numerical simulations are carried out to investigate the influences of the contact angle of the hydrophilic region of the mixed surface, the pillar width, and the pillar height. It is found that an appropriate increase of the contact angle of the hydrophilic region, theta(phi), can promote the bubble nucleation on the bottom substrate and hence enhances the nucleate boiling on the hydrophilic-hydrophobic mixed surface, but a larger theta(phi) may make the boiling enter the transition or film boiling regime. Moreover, it is shown that the heat flux initially increases with the increase of the pillar width and shows a declining trend after reaching its peak value. The optimal theta(phi) and the optimal pillar width are found to decrease with the increase of the wall superheat, revealing that the hydrophilic region of the mixed surface should play an increasingly important role when the wall superheat increases. The orthogonal array tests are performed and it is found that the contact angle of the hydrophilic region is the most important influential factor among the three investigated factors.
机译：本文使用具有液相变化的三维（3D）热多相晶格Boltzmann模型，使用具有液相变化的三维（3D）热多相晶格Boltzmann模型进行数值研究的沸腾热传递性能。混合表面是方形柱纹理，柱子由亲水侧壁和疏水顶表面组成。进行数值模拟，以研究混合表面，柱宽和柱高度的亲水区接触角的影响。结果发现，亲水区（PHI）的接触角的适当增加可以促进底部基材上的气泡成核，因此增强了亲水 - 疏水混合表面上的核心沸点，但较大的θ（PHI ）可以使沸腾进入过渡或薄膜沸腾制度。此外，示出了随着柱宽度的增加，热通量最初增加，并且在达到其峰值后显示出下降的趋势。发现最佳的θ（phi）和最佳柱宽度随着壁过热的增加而降低，揭示混合表面的亲水区应在壁过热增加时起到越来越重要的作用。进行正交阵列测试，发现亲水区的接触角是三个研究因素中最重要的影响因素。

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