三次多项式温度分布液相模型在液滴蒸发中的应用  

Application of the 3^(rd)-order Polynomial Temperature Profile Liquid Model in Predicting Droplet Vaporizing

作　　者：李玮玉 周致富[1] 陈斌[1] 王国祥[1,2] 应朝霞[3] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049 [2]美国Akron大学机械工程系 [3]西安交通大学医学院第二附属医院皮肤科,西安710049

出　　处：《工程热物理学报》2017年第5期1012-1016,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51406151);中央高校基本科研业务费专项资金

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。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.

关 键 词：液滴蒸发 希尔球涡 三次多项式模型 液滴黏度 

分 类 号：TK124[动力工程及工程热物理—工程热物理]