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Entropy 2014, 16(10), 5178-5197; doi:10.3390/e16105178

Entropy Generation in Flow of Highly Concentrated Non-Newtonian Emulsions in Smooth Tubes

Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
Received: 23 August 2014 / Revised: 21 September 2014 / Accepted: 28 September 2014 / Published: 7 October 2014
(This article belongs to the Section Thermodynamics)
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Abstract

Entropy generation in adiabatic flow of highly concentrated non-Newtonian emulsions in smooth tubes of five different diameters (7.15–26.54 mm) was investigated experimentally. The emulsions were of oil-in-water type with dispersed-phase concentration (Φ) ranging from 59.61–72.21% vol. The emulsions exhibited shear-thinning behavior in that the viscosity decreased with the increase in shear rate. The shear-stress (τ) versus shear rate (˙γ) data of emulsions could be described well by the power-law model: τ=K˙γn. The flow behavior index n was less than 1 and it decreased sharply with the increase in Φ whereas the consistency index K increased rapidly with the increase in Φ . For a given emulsion and tube diameter, the entropy generation rate per unit tube length increased linearly with the increase in the generalized Reynolds number ( Re_n ) on a log-log scale. For emulsions with Φ ≤65.15 % vol., the entropy generation rate decreased with the increase in tube diameter. A reverse trend in diameter-dependence was observed for the emulsion with Φ of 72.21% vol. New models are developed for the prediction of entropy generation rate in flow of power-law emulsions in smooth tubes. The experimental data shows good agreement with the proposed models. View Full-Text
Keywords: emulsion; non-Newtonian; power law; entropy generation; pipeline flow; exergy destruction emulsion; non-Newtonian; power law; entropy generation; pipeline flow; exergy destruction
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Pal, R. Entropy Generation in Flow of Highly Concentrated Non-Newtonian Emulsions in Smooth Tubes. Entropy 2014, 16, 5178-5197.

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