The effects of temperature and hydrodynamics on the crystallization fouling under cross flow conditions

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dc.contributor.authorHasan, B.
dc.contributor.authorNathan, G.
dc.contributor.authorAshman, P.
dc.contributor.authorCraig, R.
dc.contributor.authorKelso, R.
dc.date.issued2012
dc.description.abstractCrystallization fouling experiments were performed in a channel for a cross flow of hot saturated sodium sulphate (Na <inf>2</inf>SO <inf>4</inf>) solution over a pipe containing cold water. The heat transfer coefficient and fouling thermal resistance were determined from measurements of local surface temperature and the thickness of the crystalline fouling layer. A systematic assessment of the asymptotic variation of these parameters with time was obtained for a range of hot salt solution Reynolds number based on pipe diameter (Re <inf>hD</inf>) of 165-485, salt solution bulk temperature of 30 °C-50 °C, and cold water (at 5 °C) Reynolds number in the pipe (Re <inf>c</inf>) of 7500-25000. It was found that the temperature of the salt solution has a large effect on the fouling rate. Increasing the pipe surface temperature decreases the crystallization fouling rate. Increasing the hot solution Reynolds number, via the velocity, decreases the fouling thermal resistance, while increasing the cold water Reynolds number, via the velocity, decreases the fouling thermal resistance, but at the same time it increases the fouling layer thickness. The crystallization process that applies here was found to be under activation control (i.e. chemical kinetic control) so that the mass transport of salt plays only a minor role. © 2011 Published by Elsevier Ltd. All rights reserved.
dc.description.statementofresponsibilityBasim O. Hasan, Graham J. Nathan, Peter J. Ashman, Richard A. Craig, Richard M. Kelso
dc.identifier.citationApplied Thermal Engineering, 2012; 36(1):210-218
dc.identifier.doi10.1016/j.applthermaleng.2011.12.027
dc.identifier.issn1359-4311
dc.identifier.orcidNathan, G. [0000-0002-6922-848X]
dc.identifier.orcidAshman, P. [0000-0003-1876-4546]
dc.identifier.orcidKelso, R. [0000-0002-5783-9232]
dc.identifier.urihttp://hdl.handle.net/2440/71955
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.rightsCopyright © 2011 Elsevier Ltd. All rights reserved.
dc.source.urihttps://doi.org/10.1016/j.applthermaleng.2011.12.027
dc.subjectFouling
dc.subjectCrystallization
dc.subjectCross flow
dc.subjectSodium sulphate
dc.subjectSurface temperature
dc.titleThe effects of temperature and hydrodynamics on the crystallization fouling under cross flow conditions
dc.typeJournal article
pubs.publication-statusPublished

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