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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of dissolved gas on bubble growth on a biphilic surface: A diffuse-interface simulation approach
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Effect of dissolved gas on bubble growth on a biphilic surface: A diffuse-interface simulation approach

机译：溶解气体对双亲表面气泡生长的影响：扩散界面模拟方法

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摘要

In this paper, we numerically study pool boiling of a binary (water and nitrogen) mixture on a surface endowed with a combination of hydrophobicity and hydrophilicity (i.e., the so called biphilic surface). Here we adopt a numerical approach based on the phase field theory, where the vapor-liquid interface is assumed to be of a finite thickness (hence diffusive in nature) and requires no explicit tracking schemes. The theoretical modeling of two-phase heat and mass transfer in water diluted with nitrogen demonstrates the signiant impact of impurities on bubble dynamics. The simulations show that locally high concentrations of nitrogen gas within the vapor bubble is essential to weakening the condensation effect, which results in sustained bubble growth and ultimately (partial) departure from the surface under the artificially enlarged gravity. Simply increasing the solubility of nitrogen in water, however, turns out to be counterproductive because possible re-dissolution of the aggregated nitrogen by the bulk water could deprive the bubble of vital gas contents, leading instead to continuous bubble shrinkage and collapse. Additionally, it is found that with the significant accumulation of nitrogen, the bubble interface is increasingly dominated by a strong interfacial thermocapillary flow due to the Marangoni effect. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在本文中，我们通过数值研究在具有疏水性和亲水性的表面（即所谓的双亲表面）上的二元（水和氮）混合物的池沸腾。在这里，我们采用基于相场理论的数值方法，其中假定气液界面的厚度是有限的（因此本质上具有扩散性），并且不需要明确的跟踪方案。用氮气稀释的水中的两相传热和传质的理论模型证明了杂质对气泡动力学的显着影响。模拟表明，气泡中局部高浓度的氮气对于减弱冷凝作用至关重要，这会导致气泡持续增长，并最终在人工增大的重力作用下最终（部分）离开表面。然而，简单地增加氮气在水中的溶解度会适得其反，因为大量水可能重新溶解聚集的氮气，从而剥夺了气泡中的重要气体含量，从而导致气泡不断收缩和塌陷。另外，发现由于氮的大量积累，由于马兰戈尼效应，气泡界面越来越被强的界面热毛细流动所支配。 （C）2018 Elsevier Ltd.保留所有权利。

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