【摘要】 三次多项式温度分布模型反映了液滴内部基于希尔球涡的实际流动,可以较为准确地预测单个液滴蒸发。鉴于三次多项式温度分布模型在预测单个液滴蒸发的准确高效性,本文以n-Decane油滴蒸发为例,采用三次多项式模型研究了通过改变初温和初始气流速度来改变初始雷诺数对液滴蒸发的影响,结果表明通过改变气流速度来改变雷诺数的情况,不同雷诺数下液滴蒸发率与内部温度分布存在较大差异;以n-Decane,n-Heptane和n-Dodecane三种不同黏度的油滴蒸发为例,对比了液滴黏度对蒸发的影响,发现不同黏度液滴的蒸发率与内部温度分布差异较大,黏度越小,蒸发率越快;在液滴蒸发的初始阶段,内部温度梯度较大。更多还原

【Abstract】 A 3^rd-order polynomial temperature profile liquid model for droplet evaporation was proposed recently,in which the enhancement of heat transport by internal circulation was correctly reflected due to the introduction of Hill’s vortex.Thus it could predict droplet temperature and evaporation rate well.Based on this well-built liquid evaporation model,this paper investigated the effect of initial parameters including initial droplet temperature and ambient gas velocity on droplet evaporation rate.It was found that the initial gas velocity had a larger effect on droplet evaporation rate and temperature distribution than the initial droplet temperature.Further,several kinds of liquid droplets（n-Decane,n-Heptane and n-Dodecane） were employed to study liquid viscosity on droplet evaporation.The result indicated that a smaller viscosity of liquid droplet could lead to a larger droplet evaporation rate and a greater temperature gradient inside droplet in the transient evaporation period.更多还原