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首页> 外文期刊>International Journal of Heat and Mass Transfer >3D numerical study of the liquid film distribution on the surface of a horizontal-tube falling-film evaporator
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3D numerical study of the liquid film distribution on the surface of a horizontal-tube falling-film evaporator

机译：水平管降膜蒸发器表面液膜分布的3D数值研究

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In this paper, the volume-of-fluid (VOF) model is adopted to simulate the distribution and flow of a liquid film on the outer surface of the horizontal tube of a falling-film evaporator. The plain tube diameter and the spray distance are 25.4 and 22 mm respectively. The temporal variation characteristics of inline jet flow, the adjacent liquid column, and the steady-state film thickness distribution over the horizontal tubes are analyzed. To better compare with the experimental results, two kinds of numerical simulation medium, water and ethylene glycol, are chosen. The results of the 3-D numerical simulations and experiment are in good agreement. The results show that the jet flow can be divided into inline jet flow and staggered jet flow. Furthermore, a trough forms between the adjacent liquid columns under inline jet flow, whereas a crest forms between the adjacent liquid columns under staggered jet flow. In addition, the liquid viscosity is a crucial factor affecting the spreading of the liquid film. The appearance of the crest between adjacent liquid columns results in staggered jet flow. (C) 2018 Elsevier Ltd. All rights reserved.
机译：本文采用流体体积（VOF）模型模拟​​降膜式蒸发器水平管外表面液膜的分布和流动。普通管直径和喷涂距离分别为25.4和22 mm。分析了在线喷射流，相邻液柱和水平管上稳态膜厚度分布的时间变化特征。为了更好地与实验结果进行比较，选择了两种数值模拟介质：水和乙二醇。 3-D数值模拟与实验结果吻合良好。结果表明，射流可分为直列射流和交错射流。此外，在串联喷射流下，在相邻的液柱之间形成槽，而在交错喷射流下，在相邻的液柱之间形成波峰。另外，液体粘度是影响液膜铺展的关键因素。相邻液柱之间波峰的出现导致喷射流错开。 （C）2018 Elsevier Ltd.保留所有权利。

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