Abstract
Liquid-liquid extraction is an important unit operation in chemical engineering. The conventional designs such as mixer settler have lower-energy efficiency as the input energy is dissipated everywhere. Experimental studies have proved that the novel designs such as two-opposed-jet contacting device (TOJCD) microextractor allow energy to be dissipated close to the interface, and major part of energy is used for drop breakup and enhancement of surface renewal rates. It is very difficult to estimate the local variation of energy dissipation () using experiments. Computational fluid dynamics (CFD) has been used to obtain at different rotating speed of the top disc and nozzle velocity. In this work, performance analysis of TOJCD microextractor has been carried out using Reynolds stress model. The overall value was found in the range of 50 to 400 W/kg and shear rate in the range of 100000 1/s. A semiempirical correlation for is proposed, and parity plot with experimental data has been plotted.
Highlights
Liquid-liquid extraction (LLE) is an important unit operation in chemical engineering
It is very difficult to estimate the local variation of energy dissipation using experiments
Computational fluid dynamics (CFD) can be used in such cases to estimate the local variation of energy dissipation and optimize the hardware configuration and selection of operating conditions [6]
Summary
Liquid-liquid extraction (LLE) is an important unit operation in chemical engineering. Two streams result from this contact: the extract, which is the solvent-rich solution containing the desired extracted solute, and the raffinate, the residual feed solution containing little solute The conventional designs such as mixer settler often have lower energy efficiency as the input energy is dissipated everywhere in the extractor. The present work deals with Reynolds stress modelling of two-opposed-jet contact device designed by Dehkordi [1, 2]. The main objectives of present work were to obtain energy dissipation rate and shear rate distributions in two-opposed-jet microextractor for various geometric and operating conditions. The focus is not on getting individual components of energy utilization (i), (ii), and (iii), but to get overall dissipation rate This can be obtained using single-phase simulations. Singlephase CFD simulation using Reynolds stress model has been carried out for preliminary analysis of microextractor
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