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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
Entropy 2014, 16(10), 5178-5197; https://doi.org/10.3390/e16105178
Received: 23 August 2014 / Revised: 21 September 2014 / Accepted: 28 September 2014 / Published: 7 October 2014
(This article belongs to the Section Thermodynamics)
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
MDPI and ACS Style

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

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