Hydrodynamics of a Stirred Vessel Equipped with a Gas-Inducing Impeller

Abstract

Hydrodynamic characteristics of a gas-liquid reactor equipped with a gas-inducing impeller were investigated. Four different impeller designs and two different ring spargers were used. The effects of superficial gas velocity, liquid submergence, and the interimpeller clearance on the critical impeller speed for gas induction, the rate of gas induction, and the fractional gas hold-up were investigated. The critical impeller speed was found to increase with an increase in the superficial velocity of the sparged gas. It was also affected by the lower impeller design and the sparger size. The rate of gas induction was found to decrease with an increase in the superficial gas velocity. It also depends on the lower impeller design and the sparger size. The liquid submergence had an optimum value at which the rate of gas induction was a maximum. The data obtained could be successfully correlated on the basis of mathematical models developed earlier.

Critical Review of Gas–Liquid Mixing Using Gas-Inducing Impellers: Modeling, CFD Simulation, and ANN Applications

“…Smith’s correlation for fractional gas holdup encompassed a diverse array of stirred vessel sizes and operational parameters. It is also valid for simultaneous gas induction and sparging, as investigated by Patwardhan and Joshi . Smith’s correlation is: …”

“…Smith’s correlation for fractional gas holdup encompassed a diverse array of stirred vessel sizes and operational parameters. It is also valid for simultaneous gas induction and sparging, as investigated by Patwardhan and Joshi . Smith’s correlation is: ε G = a true( D T true) b true( N 2 Q normalG ρ L μ g true) C = a true( D T true) b false( R e italicF italicr italicF italicl false) C …”

“…A detailed summary of double-impeller GIRs investigations has shown in Table S2. 1,5,11,14,19,21,61,62,66,67…”

“…It is also valid for simultaneous gas induction and sparging, as investigated by Patwardhan and Joshi. 67 Smith's 90 correlation is:…”

Critical Review of Gas–Liquid Mixing Using Gas-Inducing Impellers: Modeling, CFD Simulation, and ANN Applications

“…Smith’s correlation for fractional gas holdup encompassed a diverse array of stirred vessel sizes and operational parameters. It is also valid for simultaneous gas induction and sparging, as investigated by Patwardhan and Joshi . Smith’s correlation is: …”

“…Smith’s correlation for fractional gas holdup encompassed a diverse array of stirred vessel sizes and operational parameters. It is also valid for simultaneous gas induction and sparging, as investigated by Patwardhan and Joshi . Smith’s correlation is: ε G = a true( D T true) b true( N 2 Q normalG ρ L μ g true) C = a true( D T true) b false( R e italicF italicr italicF italicl false) C …”

“…A detailed summary of double-impeller GIRs investigations has shown in Table S2. 1,5,11,14,19,21,61,62,66,67…”

“…It is also valid for simultaneous gas induction and sparging, as investigated by Patwardhan and Joshi. 67 Smith's 90 correlation is:…”

Aeration of Large Size Tanks by a Surface Agitator

“…3), so its pumping capacity is better, and it can push the dispersion further from the mixing system. Saravanan and Joshi [3] and Patwardhan and Joshi [4] have also shown that the combination of a gas-inducing turbine with an up-flow impeller below it increases the fractional gas holdup in the whole tank. The low (see Fig.…”

Critical Review of Gas–Liquid Mixing Using Gas-Inducing Impellers: Modeling, CFD Simulation, and ANN Applications

“…Smith’s correlation for fractional gas holdup encompassed a diverse array of stirred vessel sizes and operational parameters. It is also valid for simultaneous gas induction and sparging, as investigated by Patwardhan and Joshi . Smith’s correlation is: …”

“…Smith’s correlation for fractional gas holdup encompassed a diverse array of stirred vessel sizes and operational parameters. It is also valid for simultaneous gas induction and sparging, as investigated by Patwardhan and Joshi . Smith’s correlation is: ε G = a true( D T true) b true( N 2 Q normalG ρ L μ g true) C = a true( D T true) b false( R e italicF italicr italicF italicl false) C …”

“…A detailed summary of double-impeller GIRs investigations has shown in Table S2. 1,5,11,14,19,21,61,62,66,67…”

“…It is also valid for simultaneous gas induction and sparging, as investigated by Patwardhan and Joshi. 67 Smith's 90 correlation is:…”

Aeration of Large Size Tanks by a Surface Agitator

“…3), so its pumping capacity is better, and it can push the dispersion further from the mixing system. Saravanan and Joshi [3] and Patwardhan and Joshi [4] have also shown that the combination of a gas-inducing turbine with an up-flow impeller below it increases the fractional gas holdup in the whole tank. The low (see Fig.…”

Critical Review of Gas–Liquid Mixing Using Gas-Inducing Impellers: Modeling, CFD Simulation, and ANN Applications

“…Smith’s correlation for fractional gas holdup encompassed a diverse array of stirred vessel sizes and operational parameters. It is also valid for simultaneous gas induction and sparging, as investigated by Patwardhan and Joshi . Smith’s correlation is: …”

“…Smith’s correlation for fractional gas holdup encompassed a diverse array of stirred vessel sizes and operational parameters. It is also valid for simultaneous gas induction and sparging, as investigated by Patwardhan and Joshi . Smith’s correlation is: ε G = a true( D T true) b true( N 2 Q normalG ρ L μ g true) C = a true( D T true) b false( R e italicF italicr italicF italicl false) C …”

“…A detailed summary of double-impeller GIRs investigations has shown in Table S2. 1,5,11,14,19,21,61,62,66,67…”

“…It is also valid for simultaneous gas induction and sparging, as investigated by Patwardhan and Joshi. 67 Smith's 90 correlation is:…”

Aeration of Large Size Tanks by a Surface Agitator

“…3), so its pumping capacity is better, and it can push the dispersion further from the mixing system. Saravanan and Joshi [3] and Patwardhan and Joshi [4] have also shown that the combination of a gas-inducing turbine with an up-flow impeller below it increases the fractional gas holdup in the whole tank. The low (see Fig.…”