Simulation of viscoplastic flow past cylinders in tubes

Mitsoulis, Evan; Galazoulas, Spyros

doi:10.1016/j.jnnfm.2008.10.006

Cited by 20 publications

(11 citation statements)

References 23 publications

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“…In the same configuration, however, Putz et al (2008) reported a marked discrepancy between experiments and numerical predictions concerning the velocity field in the fluid and the shape of the yield surfaces. For flows past cylindrical objects, numerical simulations performed by Mitsoulis & Galazoulas (2009) resulted in drag forces disagreeing by up to 100 % with earlier experiments of Jossic & Magnin (2001). Concerning the case of free-surface flows, Ancey & Cochard (2009) studied the propagation speed and shape of surges avalanching down an inclined plane, and compared these data to predictions of a thin-layer model based on the Herschel-Bulkley law.…”

Section: Introductionmentioning

confidence: 91%

Experimental investigation of viscoplastic free-surface flows in a steady uniform regime

2014

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We present experimental results focused on the hydraulic properties of free-surface flows of viscoplastic fluids. The objective is to investigate the possibility of predicting macroscopic flow properties on the base of conventional rheometrical characterization of the fluids. The experiments are performed in an inclined conveyor-belt channel allowing us to generate gravity-driven surges which remain stationary in the laboratory frame. Two different types of materials are studied: Kaolin slurries and Carbopol microgels. Global height-velocity relationships and local velocity profiles are measured in the uniform zone for different experimental conditions (slope angle, rheological parameters). These data are then compared to theoretical predictions based on the Herschel-Bulkley constitutive law and independent measurements of the rheological parameters. Great care has been devoted to the determination of experimental uncertainties, including those associated with the rheometrical characterization. For Kaolin, the experimental results show excellent agreement with theoretical predictions. With Carbopol, on the contrary, a systematic discrepancy between measured and theoretical flow heights is observed. The velocity profiles do nevertheless remain consistent with a Herschel-Bulkley rheology, and we show that all experimental data can be explained by increasing the rheological parameters (yield stress and consistency) by 10-20 % compared to the values measured in the rheometer. Potential interpretations for this discrepancy are discussed.

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Section: Introductionmentioning

confidence: 91%

Experimental investigation of viscoplastic free-surface flows in a steady uniform regime

2014

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“…This discontinuity can and does lead to numerical instabilities in the low shear rate region. In order to avoid this instability some modification of the Herschel-Bulkley model has been suggested (Mitsoulis and Galazoulas, 2009;Labsi et al, 2010). For example use of the constitutive law, which was proposed by Papanastasiou (1987):…”

Section: Resultsmentioning

confidence: 99%

On the influence of storage duration on rheological properties of liquid egg products and response of eggs to impact loading – Japanese quail eggs

Kumbár

Trnka

Nedomová

et al. 2015

Journal of Food Engineering

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“…Typically, a value of m = 1,000 s is considered (Min et al . ; Mitsoulis and Zisis ; Mitsoulis and Galazoulas ).…”

Section: Mathematical and Numerical Modelingmentioning

confidence: 99%

“…In order to approximate the ideal Bingham model, the value of m should be large. Typically, a value of m = 1,000 s is considered (Min et al 1997;Mitsoulis and Zisis 2001;Mitsoulis and Galazoulas 2009). h is the apparent viscosity of the fluid.…”

Section: Rheological Modelmentioning

confidence: 99%

Heat and Flow Properties of a Temperature Dependent Viscoplastic Fluid Including Viscous Dissipation

Labsi

Benkahla

Boutra

et al. 2012

J Food Process Engineering

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The present study concerns the numerical analysis using the finite volume method, of laminar forced convection flow of a viscoplastic fluid. The flow takes place in a circular pipe maintained at uniform wall temperature. The fluid consists of the sloe fruit juice with low pulp and pectin contents which obeys the rheological model of Bingham. The Nusselt number and the friction factor when both viscous dissipation and variability of the viscosity upon temperature for heating and cooling cases are taken into account are calculated and compared to those obtained for an isothermal flow when viscous dissipation is neglected. The results show that neglecting both viscous dissipation and the temperature dependency of viscosity leads to underestimate heat transfer and pressure drop. PRACTICAL APPLICATIONSHeat transfer and pressure drop are important parameters in industries dealing with fluids, especially food industry. These parameters are used to predict the fluid's flow behavior and to estimate energy needed to for heating and transporting. A miscalculation of these parameters, when neglecting some factors in calculation such as the temperature dependency of viscosity or viscous dissipation, may result in significant errors in equipment design. The results obtained from the present study give an idea on how much heat transfer and pressure drop are underestimated when neglecting either the viscous dissipation or the temperature dependence of the fluid viscosity or both of them, when dealing with viscoplastic fluids such as fruit juices.

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Simulation of viscoplastic flow past cylinders in tubes

Cited by 20 publications

References 23 publications

Experimental investigation of viscoplastic free-surface flows in a steady uniform regime

Experimental investigation of viscoplastic free-surface flows in a steady uniform regime

On the influence of storage duration on rheological properties of liquid egg products and response of eggs to impact loading – Japanese quail eggs

Heat and Flow Properties of a Temperature Dependent Viscoplastic Fluid Including Viscous Dissipation

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