Dynamic performance of vacuum membrane distillation system

Research output: Contribution to journalArticle

Abstract

The aim of this work was the development of a numerical methodology to simulate and study the dynamic behavior of vacuum membrane distillation (VMD) system. A time-dependent one-dimensional finite difference numerical model is developed to study the flow as well as thermal regimes and the dynamic operational performance of VMD under stepped flow disturbance function in the hot channel. The study simulates the process parameters including mass flow rates, temperatures, vapor pressures, and concentration distributions for the hot feed channels along the flat-plate membrane length with transmembrane flux. The developed dynamic tool predicts the hydrodynamic behaviors and thermal characteristics of the very thin channels of VMD module. A rectangular pulse disturbance function is applied to rise up the inlet hot mass flow rate from steady state (SS) value of 1 to 1.34 kg/s for 60 s. The model ran for 3 min, which included the 60 s of applied dynamic disturbance; it started at the 10th s and finished at the 70th s. The results show that the probability of the pressure rise and the salt precipitation (scaling problem) will appear on the second half of the membrane length more than on the first half. The hydrodynamic influence of the flow conditions on the permeate flux appears to be more significant at the feed side of the VMD module fillet.

Original languageEnglish
Pages (from-to)23196-23205
Number of pages10
JournalDesalination and Water Treatment
Volume57
Issue number48-49
DOIs
Publication statusPublished - 20 Oct 2016

Fingerprint

distillation
Distillation
Vacuum
membrane
Membranes
disturbance
Hydrodynamics
hydrodynamics
Flow rate
Fluxes
thermal regime
Vapor pressure
vapor pressure
Numerical models
Salts
salt
methodology
temperature
Temperature

Keywords

  • Desalination
  • Dynamic modeling
  • Transient performance
  • Vacuum membrane distillation

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Pollution

Cite this

Dynamic performance of vacuum membrane distillation system. / Hassan, Ashraf; Fath, Hassan E S; Darwish, Mohamed; Abdulrahim, Hassan.

In: Desalination and Water Treatment, Vol. 57, No. 48-49, 20.10.2016, p. 23196-23205.

Research output: Contribution to journalArticle

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