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On the mean momentum balance in gas-solid channel flows

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.780
pages 711-716

Lihao Zhao
Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway

Helge I. Andersson
Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway

Sinopsis

The role of the particle force in the mean momentum balance of a fully-developed particle-laden turbulent channel flow is considered. The reaction force from inertial point-particles in two-way coupled simulations assists the viscous and turbulent shear stresses to balance the driving pressure gradient. The strongest effect is observed about 18 viscous length units away from the wall. The accompanying particle viscosity tends to increase the total viscosity, but the turbulent eddy viscosity is nevertheless reduced. The effect of particle additives is therefore twofold: they alter the apparent viscosity of the suspension and modulate the turbulent flow field.

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