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Scale up criteria for dual stirred gas-liquid unbaffled tank with concave blade impeller
Thiyam Tamphasana Devi,Bimlesh Kumar 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.8
Experimental investigation has been done in unbaffled gas-liquid stirred tanks using dual concave bladeimpeller to analyze the mass transfer, power consumption and gas holdup. Optimal impeller clearance has been suggestedfor lower and upper impeller based on maximum mass transfer rate. Numerical modeling has been done to analyzethe flow pattern for different combinations of impeller clearance. The lower impeller positioned at 0.3 of tank diameterand clearance between lower and upper impeller at 0.4 of tank diameter gave the maximum mass transfer coefficient. Scale-up criteria for mass transfer rate, power and gas holdup have been developed for optimal geometrical similarsystems of unbaffled stirred tanks with dual concave impeller.