Numerical simulation of evaporation and drying of a bi-component droplet
Numerical simulation of evaporation and drying of a bi-component droplet
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DOI：
10.1016/j.ijheatmasstransfer.2013.07.010
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发表时间：
2013-11-01
影响因子：
5.2
通讯作者：
Gutheil, E.
中科院分区：
文献类型：
--
作者：
Gopireddy, S. R.;Gutheil, E.
本文建立了一个描述含蒸发液和溶解固体的静止球形双组分液滴蒸发干燥行为的数学模型，并将该模型应用于研究聚合物（聚乙烯吡咯烷酮- PVP）和甘露醇（Mandarin）在水中的蒸发干燥行为。水蒸发率计算使用对流双膜模型与修改，以考虑固体层的形成。通过计算水在两种体系中的活度系数，说明了PVP或Mandarin对水蒸气压的非理想影响。所考虑的问题是由连续性（扩散）和能量方程，这是使用有限差分法求解。研究了气速、温度和相对湿度等干燥条件对蒸发和干燥速率的影响。它的结论是，本模型有效地捕捉单液滴干燥的初始阶段。(C)2013爱思唯尔有限公司保留所有权利。
A mathematical model to describe the evaporation and drying behavior of a single quiescent spherical bicomponent droplet containing evaporating liquid and dissolved solid substance is developed with primary focus on the application of this model to study the evaporation and drying of a droplet of polymer (Polyvinylpyrrolidone - PVP) in water and Mannitol in water. The water evaporation rate is computed using a convective two-film model with modifications to account for solid layer formation. The non-ideality effect induced by the presence of PVP or Mannitol on vapor pressure of water is accounted through the calculation of activity coefficient of water in either system. The problem under consideration is governed by the continuity (diffusion) and energy equations, which are solved using a finite difference method. The effect of drying conditions such as gas velocity, temperature, and relative humidity on evaporation and drying rate is studied. It is concluded that the present model effectively captures the initial stages of single droplet drying. (C) 2013 Elsevier Ltd. All rights reserved.