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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

A TWO-FLUID MODEL OF TURBULENT LIQUID-SOLID FLOW IN A HORIZONTAL CHANNEL

pages 535-540
DOI: 10.1615/TSFP6.850
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ABSTRAKT

This paper reports a prediction of fully-developed turbulent liquid-solid flow in a horizontal channel using a two-fluid model. The liquid phase is water while the solids phase consists of sand particles. The experimental measurements of Daniel (1965) of the mean mixture velocity and mean concentration are used to evaluate the numerical results. The two-fluid model of Bolio et al. (1995), originally developed for dilute gas-solid flows, was used to simulate the horizontal channel flow. The liquid-phase stresses were calculated using a low Reynolds number k− ε turbulence model, modified to include the effects of the particle phase. The solids-phase stresses were computed from a constitutive model based on the kinetic theory of granular flow; it includes a transport equation for the granular temperature, which represents the solids velocity fluctuations. Predictions are reported for fully-developed liquid-solid flows with mean bulk solids concentrations as high as 20 percent. Comparing the numerical predictions with the experimental data, it was observed that the mixture velocity profiles were in reasonable agreement, whereas the simulations failed to reproduce specific features of the measured concentration profiles, such as the location of the peak value. The simulations indicate that as the concentration in the lower region of the duct increases, the turbulence and related transport is almost completely suppressed. Further improvements in modeling, such as including the interstitial fluid effects while computing the solids-phase stress, are needed to improve the predictive capability of the two-fluid models for these relatively dense liquid-solid flows.

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