Wall mass and heat transfer rates in a square gas‐sparged, mechanically stirred reactor were measured by the electrochemical technique under the effect of various geometrical and hydrodynamic variables. For the 45° impeller, the mass transfer data fit the equation Sh = 0.7Sc0.33Re0.2Reg0.5 with an average deviation of ±6.9 %. For the 90° impeller, the data fit the equation Sh = 0.95Sc0.33Re0.14Reg0.53 with an average deviation of ±7.5 %. Gas sparging enhanced the wall mass transfer rates by factors of up to 2.61 and 3 for the 90° and 45° impellers, respectively, with a significant decrease in the total power consumption. The contribution of the present results to the operation of multiphase mechanically agitated vessels in different aspects is outlined.
Rates of heat and liquid‐solid mass transfer in a square bubble column with semicylindrical turbulence promoters at its wall were measured using the electrochemical technique in the bubbly flow regime. Turbulence promoters enhanced the wall liquid‐solid mass or analogous heat transfer coefficients and the corresponding volumetric mass transfer coefficients by factors up to 2.36 and 3.76, respectively, depending on the working conditions. The rate of liquid‐solid mass transfer was improved with increasing superficial gas velocity and decreasing turbulence promoter diameter. The importance of the turbulence promoters as a catalyst support and a built‐in cooler was highlighted. Power consumption measurements revealed that the gas‐sparged reactor outperforms the mechanically stirred reactor.
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