Investigation of effetive parameters on hydrodynamics of rotating packed beds using computational fluid dynamics

Ghourejili, Shamsedin (2018) Investigation of effetive parameters on hydrodynamics of rotating packed beds using computational fluid dynamics. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Rotating packed beds (RPB) have been recently used in many processes in the chemical engineering, such as; distillation, desorption, absorbation, production of nano particles, refinery of nature gas, and so on. Thus, analysis flow in the equipment, is very necessary to obtain large information in the equipment. In this paper, Computational fluid dynamics was used as a suitable and economical tool for benefit analysis in RPBs. Due to the complexity of the structure of RPBs, experimental methods have a very expensive and time-consuming for analysis flows, then computational fluid dynamics, can easily improve and develop analysis flow in the equipment. In this present work, three dimensional single phase flow and two phase flows were studied. The effects of rotational speed such as clock and antic-lock wise, gas flow rate, porosity, added baffles and the rotor design on the pressure drop, were investigated. With increasing the gas flow rate, the dry pressure drop and wet pressure drop increased. Increasing liquid flow rate and prossity have a little effects on the pressure drop. The influence of the number of nozzeles on the pressure drop was investigated and the simulation results showed a little effect on the pressure drop. The added baffles increased the pressure drop for dry bed and decreased to another one. The rotor design had a negliable effect on the dry-pressure drop. Analysis of single flows in an RPB with baffles showed that the tangential velocity completety increased with respect to radial and axial velocity. Also analysis of two phase flows in an RPB with baffles showed that flow patterns of gas gradually reached to a plug flow by increasing gas flow rate at constant values of rotational speed and liquid flow rate. Also, RPB without baffles was extensively far from the plug flow. Increasing rotational speed in an RPB with and without baffles caused the flow patterns of gas to quickly reach the plug flow.The simulation results were in satisfactory agreement with experimental data and the relative error obtained 14%.

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