Influence of Gas Flow Rate on the Structure of Trailing Vortices of a Rushton Turbine: PIV Measurements and CFD Simulations

Gas–liquid flow generated by a Rushton turbine in stirred vessel: CARPT/CT measurements and CFD simulations

“…The simulations captured the decrease in impeller pumping as well as power dissipation, with increase in gas flow rate. The predicted value of pumping number for single-phase flow (0.65) was in good agreement with the experimental value (0.6) reported by Ranade et al (2001b). It can be seen that the predicted power dissipation for the flooding regime is higher than that for the 3-3 cavity regime.…”

“…Unlike single-phase flows in stirred vessels, there are few experimental studies which report the local information of gas-liquid flow generated by a Rushton turbine (for example, Ranade et al, 2001b;Deen et al, 2002). In most of the studies laser Doppler anemometry (LDA) or particle image velocimetry (PIV) were used.…”

PIV measurements of flow in an aerated tank stirred by a down- and an up-pumping axial flow impeller

“…This suggests that the liquid flow in the upper part of the vessel is controlled not only by the impeller but also by the gas phase. Similar results of liquid velocity profiles produced by a Rushton turbine in a two phase system have been reported by Deen and Hjertager [14] and Ranade et al [15].…”

“…The local investigation of velocity fields of two-phase flows in stirred tanks has been the subject of few reported works (Patterson [11]; Mishra and Joshi [12]; Rousar and Van den Akker [13]; Deen and Hjertager [14]; Ranade et al [15]). Most of these use Laser Doppler Velocimetry (LDV) to study flows produced by Rushton turbines.…”

“…They compared single phase flow patterns produced by a Rushton turbine with the liquid velocity fields in a two-phase system. Ranade et al [15] also used PIV to study the liquid flow field of an aerated stirred tank, concentrating on the effect of the gas flow rate on the trailing vortices behind the blades of a Rushton turbine.…”