A numerical model and experimental verification for analysing a new vacuum spray flash desalinator utilising low grade energy

Hosseini Araghi, A., Khiadani, M., Sadafi, M. H. and Hooman, K. (2017) A numerical model and experimental verification for analysing a new vacuum spray flash desalinator utilising low grade energy. Desalination, 413 109-118. doi:10.1016/j.desal.2017.03.014


Author Hosseini Araghi, A.
Khiadani, M.
Sadafi, M. H.
Hooman, K.
Title A numerical model and experimental verification for analysing a new vacuum spray flash desalinator utilising low grade energy
Journal name Desalination   Check publisher's open access policy
ISSN 0011-9164
1873-4464
Publication date 2017-07-01
Sub-type Article (original research)
DOI 10.1016/j.desal.2017.03.014
Open Access Status Not yet assessed
Volume 413
Start page 109
End page 118
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Collection year 2018
Language eng
Abstract This study investigates the performance of a new vacuum spray flash desalinator, a core component of the open water cycle in a discharge thermal energy combined desalination (DTECD) technology using theoretical and experimental techniques. The feedwater contains 3.5wt% of NaCl while the inlet temperature range can vary over a range of 55 °C to 75 °C based on the low temperature utilised in the DTECD system. In order to design an efficient desalinator, physical aspects of the proposed vacuum spray flash evaporation (VSFE) should be studied. Thus, an experimental study was undertaken to verify the theoretical evaporation rate and centreline temperature data. The proposed desalinator was modelled using a CFD model implemented in the available package ANSYS FLUENT 16.2 and some results are compared with a thermodynamic model embedded in ASPEN/HYSY 8.0. It was observed that the defined thermodynamic models based on vapor-liquid equilibrium in the Aspen and Fluent can predict the evaporation rate with the average errors of 5% and 17%, respectively. Moreover, discrete phase model (DPM) approach can analyse the thermo-fluid field in the desalinator with acceptable accuracy about 9%. Droplets size, velocity, temperature and concentration profiles are predicted and the underlying physics are discussed regarding the VSFE geometry.
Keyword CFD simulation
Desalination
DPM model
DTECD
Vacuum spray flash evaporation (VSFE)
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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