Variable gas density effects on transport from interacting evaporating spherical drops
Variable gas density effects on transport from interacting evaporating spherical drops
复制标题
可变气体密度对相互作用的蒸发球形液滴的传输的影响
DOI：
10.1016/j.ijheatmasstransfer.2018.05.152
复制
发表时间：
2018
影响因子：
5.2
通讯作者：
S. Tonini
中科院分区：
文献类型：
--
作者：
G. Cossali;S. Tonini
本文报告了一种分析方法来模拟从邻近的球形液滴传热和传质，考虑到气体混合物密度对温度和成分的依赖。在双球坐标系下解析求解了气态静止环境中单组分非同值球液滴蒸发的守恒方程。本文报道了水滴表面的局部热流和质量流以及蒸发率和感热率的解析表达式。通过与现有的不同蒸发种类和操作条件下的恒密度溶液的比较，量化了缓解通常采用的气体密度恒定假设的效果。该模型适用于任意路易斯数值。与单个孤立液滴的类似结果进行比较，可以量化对蒸汽和热通量以及蒸发和热速率的屏蔽效应。
The paper reports an analytical approach to model heat and mass transfer from neighbouring spherical drops accounting for the dependence of the gas mixture density on temperature and composition. The conservation equations for single-component non-identical spherical drops evaporating in gaseous quiescent environment are analytically solved in a bi-spherical coordinate system. Analytical expressions for the local heat and mass fluxes on drop surfaces and for the evaporation and the sensible heat rates are reported. The effect of relieving the commonly adopted assumption of constant gas density is quantified by comparison with existing constant density solutions for different evaporating species and operating conditions. The model applies to any value of Lewis number. Comparison with analogous results for single isolated drops allows to quantify the screening effect on vapour and heat fluxes and evaporation and heat rates.