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A general guide to design of falling film evaporators utilized in multi effect desalination units operating at high vapor qualities under a sub-atmospheric condition

机译：在低于大气压条件下以高蒸汽质量运行的多效脱盐装置中使用的降膜蒸发器设计的一般指南

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摘要

Existing heat transfer correlations poorly predict the thermal performance of falling film evaporators utilized in MED (multi effect desalination) units. At typical operating conditions of these units, most correlations suggest that the two-phase heat transfer coefficient increases with the mass flow rate and is independent of the wall superheat. Although these correlations are valid within their particular range of parameters, they are not suitable prediction tools for MED units as they operate at high vapor qualities under a sub-atmospheric condition. In addition, strong interconnected effects of the wall superheat and the mass flow rate on the thermal performance are often unavoidable in the MED units. The present study aims to elucidate the thermal transport processes of the falling film evaporators utilized in these MED units. Results show, at a constant value of Delta T/m(f) which is a design characteristic of these units, the average heat transfer coefficient first decreases and then increases as the inlet mass flow rate increases. Result also indicate the wall superheat for this transition increases at higher values of Delta T/m(f). The detailed thermo-hydrodynamic physics of the involved transport processes is elucidated using the VOF (volume of fluid) multiphase model in the curvilinear coordinate. (C) 2015 Elsevier Ltd. All rights reserved.
机译：现有的传热关系很难预测MED（多效脱盐）装置中使用的降膜蒸发器的热性能。在这些单元的典型运行条件下，大多数相关性表明，两相传热系数随质量流量的增加而增加，并且与壁过热无关。尽管这些相关在它们的特定参数范围内有效，但它们不适用于MED单元，因为它们在低于大气压的条件下以高蒸气质量运行。此外，在MED单元中，壁过热和质量流率对热性能的强烈相互影响通常是不可避免的。本研究旨在阐明在这些MED装置中使用的降膜蒸发器的热传递过程。结果表明，在恒定的Delta T / m（f）值（这是这些单元的设计特征）下，平均传热系数先下降，然后随着入口质量流量的增加而增加。结果还表明，在较高的Delta T / m（f）值下，此过渡过程的壁过热增加。使用VOF（流体体积）多相模型在曲线坐标系中阐明了所涉及的运输过程的详细热流体动力学物理学。 （C）2015 Elsevier Ltd.保留所有权利。

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