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主页 旧刊 有关人员 未来大会 American Society of Thermal and Fluids Engineering

ISSN 在线: 2379-1748

ISBN 打印: 978-1-56700-517-2 (Flash drive)

5-6th Thermal and Fluids Engineering Conference (TFEC)
May, 26–28, 2021 , Virtual

NUMERICAL STUDY OF VACUUM-AIDED SPRAY FLASH DESALINATION

Get access pages 777-787
DOI: 10.1615/TFEC2021.fip.036274

摘要

Spray flash desalination is an advanced distillation method by space flash evaporation of oversaturated multi-component droplets and/or ligaments to generate the distilled condensable vapor. Vacuum-aided spray flash is spraying the superheated and atomized droplets into a depressurized chamber whose low pressure is maintained by a continued vacuum extraction of vapors, a process of high thermal non-equilibrium and of high non-uniformity in phase changes and transport. This study presents a CFD numerical simulation to quantify some of the non-equilibrium and non-uniformity characteristics in vacuum-aided spray flash distillation, especially on the temperature difference and the thermal re-equilibrium tendency between vapor and liquid residue. Since ANSYS Fluent lacks the mathematic model of self-heat supplied evaporation in discrete phase modeling (DPM), a pressure-driven flash evaporation model is proposed and implemented into CFD via User-defined functions (UDF). Preliminary results meet a good agreement with experiments. It revealed the nonuniformed characteristics of the vapor phase (i.e., distributions of temperature and velocity), as well as the thermal non-equilibrium between the two phases. It also suggests that the salt fraction within droplets will result in negative impacts on evaporating efficiency and evaporating rate during the process.
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