Influence and CFD analysis of cooling air velocity on the purification of aqueous nickel sulfate solutions by freezing

Mehdi Hasan*, Roman Filimonov, Miia John, Joonas Sorvari, Marjatta Louhi-Kultanen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Finite energy resources and their rapidly waning imprint necessitate a sustainable wastewater treatment method. Nature could be exploited to freeze wastewater in locations which experience subzero temperatures during winter. The two most vital components that influence the efficiency of natural freezing are the ambient temperature and air velocity. The turbulent and unsteady air-cooled natural freezing is simulated for ice crystallization from 0.1 wt % and 1 wt % NiSO4 (aq) solutions. The efficiency of natural freezing is tested for different air velocities (2 ms−1, 5 ms−1) and levels of undercooling (ΔT = 0.5°C, 1°C) from the freezing temperature of the corresponding solution. The airflow in the winter simulator is modeled by computational fluid dynamics to investigate its behavior and to assess its effect on freezing.

Original languageEnglish
Pages (from-to)200-208
Number of pages9
JournalAIChE Journal
Volume64
Issue number1
DOIs
Publication statusPublished - 1 Jan 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • air velocity
  • computational fluid dynamics
  • freezing
  • ice growth rate
  • ice purity

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