![]() ![]() Changes in reactor geometry can have a significant effect on impeller performance. Under certain conditions, severe hydrodynamic instabilities over the transition between the two regimes give rise to very large torque and power fluctuations. As with downward pumping mixed flow impellers, two characteristic gas loading regimes, direct and indirect loading, can be identified. In particular, the development of large cavities causes a significant reduction in power drawn, impeller pumping capacity, and gas dispersion capability. Gassed power consumption is closely linked to cavity type and flow pattern. 76–0.84 for the A315, depending on impeller position relative to the base of the vessel. In the turbulent Reynolds number region, the unaerated impeller power numbers are constant with average values of 1.30 for the Prochem and 0. The influence of operating conditions (impeller speed and gas flow rate) and sparger position and geometry on bulk flow patterns, gas filled cavity formation, and power consumption have been investigated in detail. ![]() ![]() Studies were conducted primarily in a mixing vessel of diameter 0.56 m. This second part of a four-part series of papers reports on the hydrodynamic and power characteristics of two commercial, high solidity ratio, hydrofoil impellers, the Prochem Maxflo T and the Lightnin A315, in an air-water system. ![]()
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