Comparative Investigation on Droplet Evaporation Models for Modeling Spray in Cross-Flow
Comparative Investigation on Droplet Evaporation Models for Modeling Spray in Cross-Flow
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DOI：
10.1080/01457632.2013.837707
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发表时间：
2014-05
影响因子：
2.3
通讯作者：
Huijuan Sun;B. Bai;Haibin Zhang
中科院分区：
文献类型：
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作者：
Huijuan Sun;B. Bai;Haibin Zhang
建立了气体-喷雾液滴两相流的流动与传热传质耦合模型，用于模拟横流条件下的蒸发喷雾。比较了描述液滴在对流中蒸发和运动的关联式。计算结果的比较表明，不同的Nusselt数和舍伍德数关联式对液滴寿命有显著影响。Nusselt数和舍伍德数对液滴周围热质边界的修正是非常重要的，而不同的混合律和不同的阻力系数方程对液滴蒸发特性的影响很小。得到了喷雾液滴和横流的蒸发和运动特性。在模拟结果中观察到二次流现象，并有助于实现更均匀的温度分布和改善的蒸汽和横流的混合效果。
The coupling model of flow and heat and mass transfer for gas-spray droplet two-phase flow has been developed to simulate the evaporating spray in cross-flow. The correlations used for describing the droplet evaporation and motion in convective flow have been compared. The comparisons of calculated results show that the different correlations for determining Nusselt number and Sherwood number impose a significant influence on the lifetime of droplet. The modification of Nusselt number and Sherwood number with regard to the heat and mass boundary around the droplet is of great importance, while different mixing laws for mixture properties and different drag coefficient equations only demonstrate a slight effect on the evaporation characteristics of droplet. The characteristics of spray droplets and cross-flow in terms of both evaporation and motion are obtained. The secondary flow phenomenon is observed in the simulation results and contributes to achieving a more even distribution of temperature and an improved mixing effect of the vapor and cross-flow.