JOURNAL OF CHEMICAL ENGINEERING OF JAPAN · 1970 · 31 citations · 1 references
Natural SciencesMechanical EngineeringPhysicsFluid DynamicsMultiphase FlowRheologyTurbulenceTurbulent FlowTurbulent MixingTurbulent TransportMixersMixing BehaviorMixing ExperimentsPower ConsumptionPower Consumption ModelingTurbinesYield StressYield Stress Fluids
An experimental equation to estimate power consumption in the mixing of plastic fluids was derived. For ribbon, anchor, turbine and paddle mixers, the following equation was obtained. Np = β(Re")-1 + aNy + 1where Ny (= τy/ρn2d2) is a non-dimensional power number for the yield stress and a is a constant and can be calculated for simple mixers using the following equations. Fnorizontal = 0.58τy, Fvertical = 2.81ryFor turbine and paddle mixers, a drastic transition state was observed between laminar and turbulent regions. In the transition region the periodical generation and disappearance of vortex was observed and the effect was explained by the periodic power consumption of the mixers.
1