Evaluation of equilibrium and non-equilibrium evaporation models for many-droplet gas-liquid flow simulations
Evaluation of equilibrium and non-equilibrium evaporation models for many-droplet gas-liquid flow simulations
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DOI：
10.1016/s0301-9322(98)00028-7
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发表时间：
1998-09-01
影响因子：
3.8
通讯作者：
Bellan, J
中科院分区：
文献类型：
--
作者：
Miller, RS;Harstad, K;Bellan, J
各种液滴蒸发模型，包括经典的平衡和非平衡朗缪尔-克努森配方，通过与实验的比较，特别强调计算效率的气液流动模拟程序进行评估。所考虑的模型是那些用于液滴负载流量计算，如直接数值模拟，其中大量的个人（孤立）液滴的解决方案获得。直径和温度演变的预测苯，癸烷，庚烷，己烷和水的单组分液滴相对较大的初始尺寸类似于1毫米蒸发对流空气流。所有的模型表现几乎相同的低蒸发率在气体温度显着低于沸腾温度。对于在沸点和沸点以上的气体温度，大的偏差之间的各种模型的预测。模拟结果表明，当初始液滴直径为
A variety of liquid droplet evaporation models, including both classical equilibrium and nonequilibrium Langmuir-Knudsen formulations, are evaluated through comparisons with experiments with particular emphasis on computationally efficient procedures for gas-liquid flow simulations. The models considered are those used in droplet laden flow calculations such as direct numerical simulations for which large numbers of individual (isolated) droplet solutions are obtained. Diameter and temperature evolution predictions are made for single-component droplets of benzene, decane, heptane, hexane and water with relatively large initial sizes similar to 1 mm vaporizing in convective air flows. All of the models perform nearly identically for low evaporation rates at gas temperatures significantly lower than the boiling temperature. For gas temperatures at and above the boiling point, large deviations are found between the various model predictions. The simulated results reveal that non-equilibrium effects become significant when the initial droplet diameter is