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강창우(Changwoo Kang),Parisa Mirbod 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Flows of neutrally buoyant and non-colloidal suspensions are numerically investigated in the Taylor-Couette geometry where the inner cylinder is rotating and the outer one is stationary. The radius ratio of two cylinders is 0.877. We consider suspensions with bulk particle volume fraction ϕ<SUB>b</SUB> = 0.1 ~ 0.3 and the particle size ratio ϵ (=d/a) = 60, where d is the gap width between cylinders and a is the suspended particles radius. Numerical simulations are performed using suspension-balance model and rheological constitutive laws. The flow patterns are observed with the varying Reynolds number based on the rotating velocity of the inner cylinder, the gap width and the effective viscosity of suspensions. The transition scenario is summarized. Furthermore, the friction and torque coefficients are estimated.