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Investigation of bubble diameter and flow regime between water and dilute aqueous ethanol solutions in an airlift reactor

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Frontiers of Chemical Science and Engineering 2011年第2期5卷 194-202页

作者： Baharak SAJJADI Mostafa Keshavarz MORAVEJI reza davarnejad Department of Chemical Engineering Faculty of EngineeringArak UniversityArak 38156-8-8349Iran

In this study,the effect of ethanol addition into pure water and its concentration on bubble diameter,gas hold-up andﬂow regimes were investigated in an airlift *** and water with ethanol(concentration ranging from 0%–1%,v/v)were as dispersed and continuous phases,***ﬁcial gas velocity was consid-ered as an effective *** size distribution was measured by photography and picture analysis at various concentrations of ethanol and various velocities of *** concentration enhancement caused bubble dia-meter to ***,the bubbles diameter in pure water was nearly 4 times higher than that of ethanol with concentration of 1%(v/v)and also was 3.4 times higher than that of ethanol with concentration of 0.25%(v/v)at the highest aeration gas velocity *** ethanol solutions in lower superﬁcial gas velocity,a homogenousﬂow regime was *** trend continued to inlet gas velocity of about 0.4 cm/*** transitionﬂow regime occurred after this datum although in pure water,a homogenousﬂow regime was observed up to a superﬁcial gas velocity of 0.7 cm/*** gas hold-up in dilute ethanol solutions were more than(around 2 times)that of pure water and increased with increasing concentration of ethanol in those solutions.

关键词： airlift rector bubble diameter gas hold-up ﬂow regime ethanol

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Hydrodynamics and Mass Transfer of Oily Micro-emulsions in An External Loop Airlift Reactor

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Chinese Journal of Chemical Engineering 2014年第3期22卷 267-273页

作者： Mona Ebrahimi Fakhari Mostafa Keshavarz Moraveji reza davarnejad Department of Chemical Engineering Faculty of Engineering Arak University Department of Chemical Engineering Amirkabir University of Technology (Tehran Polytechnic) 424 Hafez Avenue

This study reports an experimental investigation on hydrodynamics and mass transfer characteristics in a 15.6x10-3 m3 external loop airlift reactor for oil-in-water micro-emulsions with oil to water volume ratio （φ） rang- ing from 3% to 7% （by volume）. For comparative purposes, experiments were also carried out with water. Increase in φ of micro-emulsion systems results in an increment in the gas holdup and a decrease in the volumetric gas-liquid oxygen transfer coefficient and liquid circulation velocity, attributed to the escalation in the viscosity of mi- cro-emulsions. The gas holdup and volumetric mass transfer coefficient for micro-emulsion systems are signifi- cantly higher than that of water system. Two correlations are developed to predict the gas holdup and oxygen trans- fer coefficient

关键词： external loop airlitt reactor laydroclynarmcs micro-emulsions oxygen transter

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CFD Simulation of Scale Influence on the Hydrodynamics of an Internal Loop Airlift Reactor

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Engineering（科研） 2012年第10期4卷 668-674页

作者： reza davarnejad Ehsan Bagheripoor Abolfazl Sahraei Department of Chemical Engineering Faculty of Engineering Arak University Arak Iran

In this work, the overall gas hold-up in the riser and down-comer of three internal airlift reactors with a working volume of 10.5, 32 and 200 l at the range of temperatures 18℃ - 21℃, under atmospheric pressure was simulated using Com-putational Fluid Dynamics (CFD). The range of superficial gas velocity was 0.5 - 3 cm/s. The three reactors geometrically were similar to each other. CFD simulation and experimental data showed that the gas hold-up in the riser and down-comer increased by increasing the reactor scale. It was concluded that the simulated data were in good agreement with the experimental ones obtained from the literature.

关键词： Internal Loop Airlift Reactor Gas Hold-Up CFD

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