Experimental and theoretical analyses of temperature polarization effect in vacuum membrane distillation

被引:128
作者
Alsaadi, Ahmad S. [1 ]
Francis, Lijo [1 ]
Amy, Gary L. [1 ]
Ghaffour, Noreddine [1 ]
机构
[1] KAUST, Water Desalinat & Reuse Ctr, Thuwal 239556900, Saudi Arabia
关键词
Vacuum membrane distillation (VMD); Temperature polarization; Mass transfer coefficient; Heat transfer; Flux sensitivity factor; EXTRACTS AQUEOUS-SOLUTION; HOLLOW-FIBER MEMBRANES; PERFORMANCE EVALUATION; SEAWATER DESALINATION; OPERATING-CONDITIONS; REVERSE-OSMOSIS; MASS-TRANSFER; TRANSPORT RESISTANCES; AROMA COMPOUNDS; HEAT-TRANSFER;
D O I
10.1016/j.memsci.2014.08.005
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
This paper discusses the effect of temperature polarization in Vacuum Membrane Distillation (VMD). The main motivation for using VMD in this work is that this module configuration is much simpler and more suitable for this kind of investigation than the other MD configurations such as Direct Contact Membrane Distillation (DCMD). The coupling between heat and mass transfer mechanisms at the feed-membrane interface is presented from a theoretical point of view. In addition, a new simple graphical method and a mathematical model for determining VMD flux are presented. The two methods used in evaluating the extent of temperature polarization effect on water vapor flux (flux sensitivity factors and temperature polarization coefficient (TPC)) are also analyzed and compared. The effect of integrating a heat recovery system in a large scale module on the TPC coefficient has also been studied and presented in this paper. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:138 / 148
页数:11
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