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Numerical investigation of effective parameters of falling film evaporation in a vertical-tube evaporator

机译：垂直管蒸发器中叶片蒸发有效参数的数值研究

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摘要

Wastewater treatment is one of the most effective solutions to manage the problem of water scarcity. Falling film evaporators are excellent technology in wastewater treatment plants. These wastewater evaporators provide high heat transfer, short residence time in the heating zone, and high-purity distilled water. In the present study, the mechanism of turbulent falling film evaporation in a vertical tube has been investigated. A model has been developed for symmetrical two-dimensional pure and saline water flow in a vertical tube under constant wall heat flux. The numerical simulation has been carried out by a commercial computational fluid dynamics code. The evaporation of saturated liquid film is simulated utilizing a two-phase volume of fluid method and Tanasawa phase-change model. The main objective of this study is to evaluate the effects of water salinity, liquid Reynolds number, wall heat flux, and liquid film thickness on the two-phase heat transfer coefficient and vapor volume fraction. The numerical heat transfer coefficients are compared with the obtained results by Chen's empirical correlation. With a MAPE≤11%, this study proves that the numerical method is highly effective at predicting the heat transfer coefficient. Moreover, the empirical coefficient of the Tanasawa model and the minimum thickness of the falling film are determined.
机译：废水处理是管理水资源稀缺问题的最有效的解决方案之一。薄膜蒸发器是废水处理厂的优异技术。这些废水蒸发器提供高传热，在加热区内的停留时间，以及高纯度蒸馏水。在本研究中，研究了垂直管中的湍流落叶膜蒸发的机理。在恒定壁热通量下垂直管中的对称二维纯净和盐水流动开发了一种模型。数值模拟已经通过商业计算流体动力学代码进行。利用两相体积的流体方法和坦帕萨沃相变模型模拟饱和液膜的蒸发。本研究的主要目的是评估水盐度，液体雷诺数，壁热通量和液膜厚度对两相传热系数和蒸汽体积分数的影响。将数值传热系数与Chen的经验相关结果进行比较。含有Mape≤11％，本研究证明了数值方法在预测传热系数方面是高效的。此外，确定了坦帕蔓模型的经验系数和下降膜的最小厚度。

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