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Duct Flow of Polymer Solutions

Azuraien Jaafar, Azuraien (2009) Duct Flow of Polymer Solutions. PhD thesis, University of Liverpool.

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The drag-reducing ability of a rigid "rod-like" polymer solution. scleroglucan. in a circular-pipe geometry together with the drag-reducing behaviour of a semi-rigid polymer, xanthan gum. in a concentric annular pipe have been investigated experimentally via pressure-drop measurements and using laser Doppler anemometry. The laminar and transitional flow in the annular pipe, with particular attention placed on the transitional regime, of two different polymers -a xanthan guns and a polymer known to exhibit a yield stress, carhopol - are also investigated in this work and compared to that ofa Nemonian fluid, a glycerine-water mixture. Complete nccological characterization ofthe diflerent polymer solutions investigated showed that sclerogluean. xanthan gum and carbopol, exhibited increased shear-thinning \w ith increasing Solution collcentratioll. Wall slip occurred in the carbopol solutions and was minimized using a roughened parallel-plate geometry I'or the steady-shear viscosity measurements producing a very high first Newtonian region at cry low shear stresses. typical ol'a "yiel(l stress- fluid. Capillary break-up extensional viscosity measurements conducted for scleroglucan and xanthan guns showed Nemonian-like linear filament-thinning behaviour mth a Trouton ratio (»)) confirnlin`g the non-Nemonian nature of these polymers in extensional flow. The drag-rccluctloll study tör scleroglucan was carried 0111 in a glass pipc-flom facility. A concentric annular-flow hicility (radius ratio A-=0.506) as utilized for the drab, -rccluction and transitional flow study of zanthan gum and carhopol. For all fluids. pressure-drop and detailed mean l1ow and turbulence characteristics were obtained at axial distances from the inlet sufficient for the Ncwonian and non-Newtonian flows to reach fully-developed conditions

Item Type: Thesis (PhD)
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Mechanical
Depositing User: Users 5 not found.
Date Deposited: 11 Jan 2012 12:18
Last Modified: 25 Jan 2017 09:44
URI: http://utpedia.utp.edu.my/id/eprint/515

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