Effect of Weissenberg number on polymer-laden turbulence
Sajjad ur Rehman, Junghoon Lee, Changhoon Lee
Abstract
By adopting the direct force formulation in a finitely extensible nonlinear elastic (FENE) model for the feedback force by laden polymers to stationary isotropic turbulence, we clearly identified the energy flow between turbulence and polymers. The stretching motion of turbulence is suppressed by the polymer springs with large Weissenberg number, resulting in suppression of turbulent kinetic energy and energy dissipation.The direct force model seems to be more efficient in providing physical insight than the polymer stress model based on the conformation tensor.
Topics & Concepts
Weissenberg numberTurbulenceTurbulence kinetic energyIsotropyDissipationMechanicsClassical mechanicsTensor (intrinsic definition)PolymerKinetic energyStatistical physicsViscoelasticityPhysicsNonlinear systemK-epsilon turbulence modelFlow (mathematics)ThermodynamicsOpticsMathematicsGeometryQuantum mechanicsNuclear magnetic resonanceRheology and Fluid Dynamics StudiesFluid Dynamics and Turbulent FlowsParticle Dynamics in Fluid Flows