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A computational study of droplet evaporation with fuel vapor jet ejection induced by localized heat sources

机译：局部热源引起的燃料蒸气喷射产生的液滴蒸发的计算研究

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Droplet evaporation by a localized heat source under microgravity conditions was numerically investigated in an attempt to understand the mechanism of the fuel vapor jet ejection, which was observed experimentally during the flame spread through a droplet array. An Eulerian-Lagrangian method was implemented with a temperature-dependent surface tension model and a local phase change model in order to effectively capture the interfacial dynamics between liquid droplet and surrounding air. It was found that the surface tension gradient caused by the temperature variation within the droplet creates a thermo-capillary effect, known as the Marangoni effect, creating an internal flow circulation and outer shear flow which drives the fuel vapor into a tail jet. A parametric study demonstrated that the Marangoni effect is indeed significant at realistic droplet combustion conditions, resulting in a higher evaporation constant. A modified Marangoni number was derived in order to represent the surface force characteristics. The results at different pressure conditions indicated that the nonmonotonic response of the evaporation rate to pressure may also be attributed to the Marangoni effect. (C) 2015 AIP Publishing LLC.
机译：通过数值研究局部热源在微重力条件下产生的液滴蒸发，以试图理解燃料蒸气喷射的喷射机理，这是在火焰通过液滴阵列扩散过程中通过实验观察到的。为了有效地捕获液滴与周围空气之间的界面动力学，采用了基于温度的表面张力模型和局部相变模型的欧拉方法。发现由液滴内的温度变化引起的表面张力梯度产生了热毛细效应，称为马兰戈尼效应，产生了内部流动循环和外部剪切流，其将燃料蒸气驱动为尾部喷射流。参数研究表明，在实际的液滴燃烧条件下，马兰戈尼效应确实很明显，从而导致较高的蒸发常数。推导了修改后的Marangoni数，以表示表面力特性。在不同压力条件下的结果表明，蒸发速率对压力的非单调响应也可能归因于马兰戈尼效应。 （C）2015 AIP Publishing LLC。

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