Effects of oscillating gas-phase flow on an evaporating multicomponent droplet
Effects of oscillating gas-phase flow on an evaporating multicomponent droplet
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DOI：
10.1017/jfm.2023.30
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发表时间：
2023-02
影响因子：
3.7
通讯作者：
S. Majee;A. Saha;S. Basu
中科院分区：
文献类型：
--
作者：
S. Majee;A. Saha;S. Basu
摘要非定常流中蒸发液滴的动力学在许多工业应用和自然过程中具有实际意义。为了研究这种液滴的传输和蒸发动力学，我们提出了一个孤立的液滴在振荡的气相流的数值研究。该研究使用单向耦合两相流模型来评估正弦外部流场的振幅和频率对含有溶解在挥发性溶剂中的非挥发性溶质的多组分液滴的寿命的影响。结果表明，随着气相振荡幅度或频率的增大，蒸发过程加快。液滴内部的液相输运也受到外部气相流的不稳定性的影响。随后进行缩放分析的基础上的液滴的振荡阻力下的响应统一在各种条件下的模拟中观察到的蒸发动力学。分析量化的液滴速度和雷诺数的增强作为气相振荡参数的函数，并预测对蒸发速率的影响。
Abstract The dynamics of an evaporating droplet in an unsteady flow is of practical interest in many industrial applications and natural processes. To investigate the transport and evaporation dynamics of such droplets, we present a numerical study of an isolated droplet in an oscillating gas-phase flow. The study uses a one-way coupled two-phase flow model to assess the effect of the amplitude and the frequency of a sinusoidal external flow field on the lifetime of a multicomponent droplet containing a non-volatile solute dissolved in a volatile solvent. The results show that the evaporation process becomes faster with an increase in the amplitude or the frequency of the gas-phase oscillation. The liquid-phase transport inside the droplet also is influenced by the unsteadiness of the external gas-phase flow. A scaling analysis based on the response of the droplet under the oscillating drag force is subsequently carried out to unify the observed evaporation dynamics in the simulations under various conditions. The analysis quantifies the enhancement in the droplet velocity and Reynolds number as a function of the gas-phase oscillation parameters and predicts the effects on the evaporation rate.