The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Deresh Ramjugernath - One of the best experts on this subject based on the ideXlab platform.
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gas liquid Mass Transfer in a falling film microreactor effect of reactor orientation on liquid side Mass Transfer coefficient
Chemical Engineering Science, 2016Co-Authors: David Lokhat, Ashveer Krishen Domah, Kuveshan Padayachee, Aman Baboolal, Deresh RamjugernathAbstract:Abstract Microreactors offer a unique platform for chemical syntheses and have been applied to numerous reaction types including nitrations, fluorinations and hydrogenations. A key feature of falling film microreactors is the comparably large specific surface area they afford compared to conventional reactors. The enhanced heat and Mass Transfer characteristics can be exploited for rapid and exothermic reactions. Adequate understanding of the Mass Transfer processes occurring within microchannels is necessary for proper reactor design and optimization. In the current study the influence of reaction plate orientation and gas flowrate on liquid-side Mass Transfer coefficient was investigated via CO2 absorption experiments. Lower plate angles resulted in lower liquid-side Mass Transfer coefficients. At higher film velocities the rate of Mass Transfer was greater. The experimentally determined Mass Transfer coefficients were at least twice as high as those predicted either by film or penetration theory. The enhancement in Mass Transfer is suggested to be due to cellular convection in the microchannels. For inclined reaction plates, increasing the gas flowrate had a positive effect on the Mass Transfer characteristics due to induced fluctuations of the gas–liquid interface.
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Gas–liquid Mass Transfer in a falling film microreactor: Effect of reactor orientation on liquid-side Mass Transfer coefficient
Chemical Engineering Science, 2016Co-Authors: David Lokhat, Ashveer Krishen Domah, Kuveshan Padayachee, Aman Baboolal, Deresh RamjugernathAbstract:Abstract Microreactors offer a unique platform for chemical syntheses and have been applied to numerous reaction types including nitrations, fluorinations and hydrogenations. A key feature of falling film microreactors is the comparably large specific surface area they afford compared to conventional reactors. The enhanced heat and Mass Transfer characteristics can be exploited for rapid and exothermic reactions. Adequate understanding of the Mass Transfer processes occurring within microchannels is necessary for proper reactor design and optimization. In the current study the influence of reaction plate orientation and gas flowrate on liquid-side Mass Transfer coefficient was investigated via CO2 absorption experiments. Lower plate angles resulted in lower liquid-side Mass Transfer coefficients. At higher film velocities the rate of Mass Transfer was greater. The experimentally determined Mass Transfer coefficients were at least twice as high as those predicted either by film or penetration theory. The enhancement in Mass Transfer is suggested to be due to cellular convection in the microchannels. For inclined reaction plates, increasing the gas flowrate had a positive effect on the Mass Transfer characteristics due to induced fluctuations of the gas–liquid interface.
Gautam Biswas - One of the best experts on this subject based on the ideXlab platform.
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Gas-Phase Mass Transfer in a Centrifugal Contactor
Industrial & Engineering Chemistry Research, 2000Co-Authors: Pavitra Sandilya, D.p. Rao, A. Sharma, Gautam BiswasAbstract:The liquid-side Mass Transfer rate in a centrifugal gas-liquid contactor has been reported to be several times higher than that in conventional packed beds. However, no direct measurement of the gas-side Mass Transfer coefficient has been reported. We present experimental studies on gas-side Mass Transfer in a rotating packed bed with wire-gauze packing. Contrary to expectations, the gas-side Mass Transfer coefficient was much lower than that in conventional packed columns. An analysis of the gas flow, based on the equations of motion, revealed that the gas undergoes solid-body-like rotation in the rotor because of the drag offered by the packing. Therefore, the Mass Transfer coefficient should be in the same range as that in conventional packed columns. The lower value of the coefficient found experimentally is attributed to liquid maldistribution. The possibility of enhancing the Mass Transfer coefficient by enhancing the slip between the gas and the packing was explored by using a stack of closely spaced disks as the packing. Mass Transfer studies with a pair of disks were conducted. Higher throughputs and Mass Transfer rates than those with the wire-gauze packing were obtained. A stack of disks as packing appears to hold promise.
David Lokhat - One of the best experts on this subject based on the ideXlab platform.
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gas liquid Mass Transfer in a falling film microreactor effect of reactor orientation on liquid side Mass Transfer coefficient
Chemical Engineering Science, 2016Co-Authors: David Lokhat, Ashveer Krishen Domah, Kuveshan Padayachee, Aman Baboolal, Deresh RamjugernathAbstract:Abstract Microreactors offer a unique platform for chemical syntheses and have been applied to numerous reaction types including nitrations, fluorinations and hydrogenations. A key feature of falling film microreactors is the comparably large specific surface area they afford compared to conventional reactors. The enhanced heat and Mass Transfer characteristics can be exploited for rapid and exothermic reactions. Adequate understanding of the Mass Transfer processes occurring within microchannels is necessary for proper reactor design and optimization. In the current study the influence of reaction plate orientation and gas flowrate on liquid-side Mass Transfer coefficient was investigated via CO2 absorption experiments. Lower plate angles resulted in lower liquid-side Mass Transfer coefficients. At higher film velocities the rate of Mass Transfer was greater. The experimentally determined Mass Transfer coefficients were at least twice as high as those predicted either by film or penetration theory. The enhancement in Mass Transfer is suggested to be due to cellular convection in the microchannels. For inclined reaction plates, increasing the gas flowrate had a positive effect on the Mass Transfer characteristics due to induced fluctuations of the gas–liquid interface.
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Gas–liquid Mass Transfer in a falling film microreactor: Effect of reactor orientation on liquid-side Mass Transfer coefficient
Chemical Engineering Science, 2016Co-Authors: David Lokhat, Ashveer Krishen Domah, Kuveshan Padayachee, Aman Baboolal, Deresh RamjugernathAbstract:Abstract Microreactors offer a unique platform for chemical syntheses and have been applied to numerous reaction types including nitrations, fluorinations and hydrogenations. A key feature of falling film microreactors is the comparably large specific surface area they afford compared to conventional reactors. The enhanced heat and Mass Transfer characteristics can be exploited for rapid and exothermic reactions. Adequate understanding of the Mass Transfer processes occurring within microchannels is necessary for proper reactor design and optimization. In the current study the influence of reaction plate orientation and gas flowrate on liquid-side Mass Transfer coefficient was investigated via CO2 absorption experiments. Lower plate angles resulted in lower liquid-side Mass Transfer coefficients. At higher film velocities the rate of Mass Transfer was greater. The experimentally determined Mass Transfer coefficients were at least twice as high as those predicted either by film or penetration theory. The enhancement in Mass Transfer is suggested to be due to cellular convection in the microchannels. For inclined reaction plates, increasing the gas flowrate had a positive effect on the Mass Transfer characteristics due to induced fluctuations of the gas–liquid interface.
M. Moo-young - One of the best experts on this subject based on the ideXlab platform.
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Liquid-phase Mass Transfer coefficients in bioreactors.
Biotechnology and bioengineering, 1992Co-Authors: Yoshinori Kawase, Benoit Halard, M. Moo-youngAbstract:Liquid-phase Mass Transfer coefficient in bioreactors have been examined. A theoretical model based on the surface renewal concept has been devloped. The predicted liquid-phase Mass Transfer coefficients are compared with the experimental data for a mycelial fermentation broth (Chaetomium cellulolyticum) and model media (carboxymethyl cellulose) in a bench-scale bubble column reactor. The liquid-phase Mass Transfer coefficient is evaluated by dividing the volumetric Mass Transfer coefficient obtained experimentally by the specific surface area estimated using the available correlations. The available literature data in bubble column and stirred tank bioreactors is also used to test the validity of the proposed model. A reasonable agreement between the model and the experimental data is found.
Pavitra Sandilya - One of the best experts on this subject based on the ideXlab platform.
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Gas-Phase Mass Transfer in a Centrifugal Contactor
Industrial & Engineering Chemistry Research, 2000Co-Authors: Pavitra Sandilya, D.p. Rao, A. Sharma, Gautam BiswasAbstract:The liquid-side Mass Transfer rate in a centrifugal gas-liquid contactor has been reported to be several times higher than that in conventional packed beds. However, no direct measurement of the gas-side Mass Transfer coefficient has been reported. We present experimental studies on gas-side Mass Transfer in a rotating packed bed with wire-gauze packing. Contrary to expectations, the gas-side Mass Transfer coefficient was much lower than that in conventional packed columns. An analysis of the gas flow, based on the equations of motion, revealed that the gas undergoes solid-body-like rotation in the rotor because of the drag offered by the packing. Therefore, the Mass Transfer coefficient should be in the same range as that in conventional packed columns. The lower value of the coefficient found experimentally is attributed to liquid maldistribution. The possibility of enhancing the Mass Transfer coefficient by enhancing the slip between the gas and the packing was explored by using a stack of closely spaced disks as the packing. Mass Transfer studies with a pair of disks were conducted. Higher throughputs and Mass Transfer rates than those with the wire-gauze packing were obtained. A stack of disks as packing appears to hold promise.
