Numerical Study of Flow Through a Reducer for Scale Growth Suppression

Das, P; Khan, MMK; Saha, SC; Rasul, MG

Numerical Study of Flow Through a Reducer for Scale Growth Suppression

Das, P Khan, MMK Saha, SC Rasul, MG

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Publisher:: Elsevier
Publication Type:: Chapter
Citation:: Thermofluid Modeling for Energy Efficiency Applications, 2016, pp. 119-148
Issue Date:: 2016-01-01

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Field	Value	Language
dc.contributor.author	Das, P
dc.contributor.author	Khan, MMK
dc.contributor.author	Saha, SC
dc.contributor.author	Rasul, MG
dc.date.accessioned	2022-11-06T05:12:48Z
dc.date.available	2022-11-06T05:12:48Z
dc.date.issued	2016-01-01
dc.identifier.citation	Thermofluid Modeling for Energy Efficiency Applications, 2016, pp. 119-148
dc.identifier.isbn	9780128023976
dc.identifier.uri	http://hdl.handle.net/10453/163238
dc.description.abstract	Scale formation in alumina refineries is a common phenomenon and it occurs where supersaturated solutions are in contact with solid surfaces. It often leads to serious on-going technical problems and is a major cause of production loss due to equipment downtime required for descaling and cleaning operations.The scale formation mechanism in Bayer process equipment is complex and is not yet fully understood. Numerous researchers indicate that scale growth is strongly affected by fluid velocity while also being influenced by a number of other factors such as the quality of bauxite ore, rheological properties of fluid, turbulence and inertia of suspended particles, and adhesive property of particles. It is common knowledge that, if the particles approach the wall at right angles, the chance to cross the laminar sub-layer to accumulate scale on the solid surface increases. The components (stream-wise (. u'x) and cross-stream (. u'r)) of the fluctuating velocity play a critical role in whether the potential for scale formation is increased or suppressed.In this chapter, a numerical study using the Finite Volume Method to analyze the fluid dynamics behavior of water as it flows through a concentric reducer used in the Bayer plant is presented. The simulation results show a significant variation of the stream-wise (. u'x) and cross-stream (. u'r) components of the fluctuating velocity as flow passes through the concentric reducer. In the reducer, the cross-stream (. u'r) component is greater than that at the walls of the straight pipes connected to the reducer. The variation of the cross-stream component of the fluctuating velocity is believed to be accountable for the increase in scale deposition at the reducer section.
dc.language	en
dc.publisher	Elsevier
dc.relation.ispartof	Thermofluid Modeling for Energy Efficiency Applications
dc.relation.isbasedon	10.1016/B978-0-12-802397-6.00006-3
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	Numerical Study of Flow Through a Reducer for Scale Growth Suppression
dc.type	Chapter
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	closed_access	*
dc.date.updated	2022-11-06T05:12:46Z
pubs.publication-status	Published

Abstract:

Scale formation in alumina refineries is a common phenomenon and it occurs where supersaturated solutions are in contact with solid surfaces. It often leads to serious on-going technical problems and is a major cause of production loss due to equipment downtime required for descaling and cleaning operations.The scale formation mechanism in Bayer process equipment is complex and is not yet fully understood. Numerous researchers indicate that scale growth is strongly affected by fluid velocity while also being influenced by a number of other factors such as the quality of bauxite ore, rheological properties of fluid, turbulence and inertia of suspended particles, and adhesive property of particles. It is common knowledge that, if the particles approach the wall at right angles, the chance to cross the laminar sub-layer to accumulate scale on the solid surface increases. The components (stream-wise (. u'x) and cross-stream (. u'r)) of the fluctuating velocity play a critical role in whether the potential for scale formation is increased or suppressed.In this chapter, a numerical study using the Finite Volume Method to analyze the fluid dynamics behavior of water as it flows through a concentric reducer used in the Bayer plant is presented. The simulation results show a significant variation of the stream-wise (. u'x) and cross-stream (. u'r) components of the fluctuating velocity as flow passes through the concentric reducer. In the reducer, the cross-stream (. u'r) component is greater than that at the walls of the straight pipes connected to the reducer. The variation of the cross-stream component of the fluctuating velocity is believed to be accountable for the increase in scale deposition at the reducer section.

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http://hdl.handle.net/10453/163238