Transition to turbulence in a concentric annular pipe

In this study the pressure-drop, mean and rms axial velocity data are measured using a differential pressure transducer and a laser Doppler anemometer for the flow of Newtonian and non-Newtonian fluids in a concentric annular pipe (radius ratio =0.5) at various Reynolds numbers encompassing the lam...

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Main Authors:	Jaafar, Azuraien, Escudier, Marcel, Poole, Robert
Format:	Conference or Workshop Item
Published:	2010
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utp.edu.my/994/ http://eprints.utp.edu.my/994/1/ISUD7_Paper_26_FEB.pdf

id	utp-994
recordtype	eprints
spelling	utp-9942017-01-19T08:24:45Z Transition to turbulence in a concentric annular pipe Jaafar, Azuraien Escudier, Marcel Poole, Robert TJ Mechanical engineering and machinery In this study the pressure-drop, mean and rms axial velocity data are measured using a differential pressure transducer and a laser Doppler anemometer for the flow of Newtonian and non-Newtonian fluids in a concentric annular pipe (radius ratio =0.5) at various Reynolds numbers encompassing the laminar, transitional and turbulent regimes. Three different fluids are utilized; a semi-rigid shear-thinning polymer (a xanthan gum), a polymer known to exhibit a yield stress (carbopol) and a Newtonian fluid (glycerine-water mixture) as the reference fluid. A longer Reynolds number range for the transitional flow regime is observed for the more shear-thinning fluid as determined from the axial rms fluctuation level measured at fixed radial locations. Contrary to what is observed for the Newtonian fluid the higher shear stress on the inner wall compared to the outer wall does not lead to earlier transition for the shear thinning and the yield stress fluids, xanthan gum and carbopol, where more turbulent activity is observed in the time traces at the outer wall region. The mean axial velocity profiles show a slight shift (~5%) of the maximum velocity location towards the outer pipe wall within the transitional regime only for the Newtonian fluid. 2010 Conference or Workshop Item NonPeerReviewed application/pdf http://eprints.utp.edu.my/994/1/ISUD7_Paper_26_FEB.pdf Jaafar, Azuraien and Escudier, Marcel and Poole, Robert (2010) Transition to turbulence in a concentric annular pipe. In: The 6th Annual European Rheology Conference, 7 - 9 April 2010, Sweden. http://eprints.utp.edu.my/994/
institution	Universiti Teknologi Petronas Universiti Teknologi Petronas
repository_type	Digital Repository
institution_category	Local University
building	UTP Repository
collection	Online Access
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Jaafar, Azuraien Escudier, Marcel Poole, Robert Transition to turbulence in a concentric annular pipe
description	In this study the pressure-drop, mean and rms axial velocity data are measured using a differential pressure transducer and a laser Doppler anemometer for the flow of Newtonian and non-Newtonian fluids in a concentric annular pipe (radius ratio =0.5) at various Reynolds numbers encompassing the laminar, transitional and turbulent regimes. Three different fluids are utilized; a semi-rigid shear-thinning polymer (a xanthan gum), a polymer known to exhibit a yield stress (carbopol) and a Newtonian fluid (glycerine-water mixture) as the reference fluid. A longer Reynolds number range for the transitional flow regime is observed for the more shear-thinning fluid as determined from the axial rms fluctuation level measured at fixed radial locations. Contrary to what is observed for the Newtonian fluid the higher shear stress on the inner wall compared to the outer wall does not lead to earlier transition for the shear thinning and the yield stress fluids, xanthan gum and carbopol, where more turbulent activity is observed in the time traces at the outer wall region. The mean axial velocity profiles show a slight shift (~5%) of the maximum velocity location towards the outer pipe wall within the transitional regime only for the Newtonian fluid.
format	Conference or Workshop Item
author	Jaafar, Azuraien Escudier, Marcel Poole, Robert
author_facet	Jaafar, Azuraien Escudier, Marcel Poole, Robert
author_sort	Jaafar, Azuraien
title	Transition to turbulence in a concentric annular pipe
title_short	Transition to turbulence in a concentric annular pipe
title_full	Transition to turbulence in a concentric annular pipe
title_fullStr	Transition to turbulence in a concentric annular pipe
title_full_unstemmed	Transition to turbulence in a concentric annular pipe
title_sort	transition to turbulence in a concentric annular pipe
publishDate	2010
url	http://eprints.utp.edu.my/994/ http://eprints.utp.edu.my/994/1/ISUD7_Paper_26_FEB.pdf
first_indexed	2018-09-08T10:04:43Z
last_indexed	2018-09-08T10:04:43Z
_version_	1611033302222766080

Transition to turbulence in a concentric annular pipe

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