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首页> 外文期刊>International Journal of Heat and Mass Transfer >Selective evaporation rate modeling of volatile binary mixture droplets
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Selective evaporation rate modeling of volatile binary mixture droplets

机译：挥发性二元混合物液滴的选择性蒸发速率建模

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摘要

Despite numerous studies about droplet evaporation dynamics, the development of an accurate model to estimate the evaporation rate has been under debate for several decades. In particular, the selective evaporation characteristics of binary mixture droplets (BMD) have not been investigated well, in spite of its importance in many applications. The present study examines the selective evaporation characteristics of BMDs and develops a corresponding evaporation rate model. Surface plasmon resonance imaging (SPRi) and long-working distance microscopic imaging methods are applied to simultaneously measure ethanol concentration and droplet geometry, respectively, over the droplet lifetime. The evaporation rates of each BMD component are calculated based on concentration measurement. In this study, the Rayleigh number is employed to analyze the effect of free convection on evaporation dynamics. A new evaporation rate model is suggested as a function of the Rayleigh number by involving diffusive and convective evaporation effects. This model shows a strong correlation with the observed selective evaporation behavior over the droplet lifetime.
机译：尽管有关于液滴蒸发动态的众多研究，但估计蒸发速度的准确模型已经在争论几十年中受到了争论。特别地，尽管其在许多应用中重要性，但尚未研究二元混合物液滴（BMD）的选择性蒸发特性。本研究研究了BMD的选择性蒸发特性，并产生了相应的蒸发速率模型。表面等离子体共振成像（SPRI）和长工作距离微观成像方法应用于分别在液滴寿命上同时测量乙醇浓度和液滴几何形状。基于浓度测量计算每个BMD组分的蒸发速率。在这项研究中，使用瑞利数来分析自由对流对蒸发动态的影响。通过涉及扩散和对流蒸发效果，建议一种新的蒸发速率模型作为瑞利数的函数。该模型显示出与液滴寿命相比观察到的选择性蒸发行为的强烈相关性。

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