Abstract
Numerical simulations of momentum transfer for a highly shear-thinning fluid (0.2% Carbopol) in a stirred tank equipped with a PMT type impeller were performed. The simulation results were verified against experimental results of both LDA and power draw measurements for the impeller speed of 8 [s-1]. Formation of an intensive mixing zoneso characteristic of caverns was observednear the impeller. In this zone the local values of the velocity, strain rate, Metzner-Otto coefficient, shear stress and intensity of energy dissipation were characterized by strong variability. It was found that stirring of the highly shear-thinning fluid produced different flow patternfromthose for Newtonian fluids. A new method for determining the size of the intensive mixing zone using numerical simulations with tracer particles was proposed. It was found that the particles were distributed only in that zone, therefore the volume occupied by the particles was defined as equivalent to the cavern.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
