Indian Journal of Science and Technology

Abstract

Background/Objectives: In chemical industries, understanding of fluid mixing is significant. The objective is to determine optimum conditions of gas-liquid mixing by changing impeller blade’s gradient, number of impeller and rotation rate. Methods/Statistical analysis: In this work, by using a computational fluid dynamic (CFD); Ansys© Fluent software, we simulated numerically a gas-liquid mixing in an agitated vessel equipped with a pitched-blade impeller. In this study, the range of the impeller blade’s gradient is between 0° to 90° with three number of impellers; impeller (a), (b) and (c) and the impeller rotation speed rate which is between 90 to 120 rpm are used. Findings: The reconstruction images of the nitrogen gas in the distilled water mixing in the agitated vessel are obtained from the Ansys© simulation. Based on the simulation results, the gradient of blades impeller at 60°, three numbers of impeller (c) and 90 rpm rotation rate are chosen as the optimum condition for well mixing condition for gas nitrogen in the agitated vessel. These three parameters indicated the most appropriate condition for distribution of the nitrogen gas in the agitated vessel. Application/Improvements: This modelling have various applications in optimization and design of a wide range of gas-liquid processes industry where the mixing process will affects about 25% of all process industry operations.
Keywords: Agitated Vessel, Ansys©, CFD, Gas-Liquid, Mixing, Pitched-blade Impeller