Transactions of FAMENA, Vol. 41 No. 4, 2017.
Original scientific paper
https://doi.org/10.21278/TOF.41404
An Investigation into Different Power Consumption Parameters of Rushton Turbines: A Computational Survey
Mohammad-Reza Ashory
; Department of Mechanical Engineering, Semnan University, Semnan, Iran
Farhad Talebi
; Department of Mechanical Engineering, Semnan University, Semnan, Iran
Heydar Roohi Ghadikolaei
; Department of Mechanical Engineering, Semnan University, Semnan, Iran
Morad Karimpour
; Department of Mechanical Engineering, Tehran University, Tehran, Iran
Abstract
In the present work, the mixing process of shear thinning liquids in a six-blade Rushton turbine is studied. A finite volume based computational fluid dynamics (CFD) simulation has been carried out and the three-dimensional turbulent flow is numerically analyzed by using the Shear Stress Transport k-ω (k-ω SST) model. Shear thinning liquids were investigated and shear thinning behaviour was modelled by the Ostwald-de Waele law. The used stirred vessel has a cylindrical shape with a flat bottom and the liquid height was kept equal to the vessel diameter. Effects of the power law index and the angle of attack of the blade on power consumption have been investigated. The results show that decreasing the angle of attack from 90° to 45° not only results in an increase in the flow rate down to the bottom of the vessel, resulting in a better mixture qualification, but also reduces the power consumption of the stirring process. To verify the simulation, axial, radial and tangential velocity components were compared with other experimental data and satisfactory agreement was found.
Keywords
Rushton turbines; mixing vessel; shear thinning fluid; blade angle of attack
Hrčak ID:
193654
URI
Publication date:
12.2.2018.
Visits: 2.077 *