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10 results on '"Dang, Minhui"'

7. Characteristics of slug flow with inertial effects in a rectangular microchannel

Author

Dong Zhengya, Dang Minhui, Ye Chunbo, Zhao Yuchao, Yao Chaoqun, and Chen Guangwen

Subjects
Shearing (physics), Microchannel, Chemistry, Applied Mathematics, General Chemical Engineering, Bubble, media_common.quotation_subject, Thermodynamics, General Chemistry, Mechanics, Inertia, Slug flow, Aspect ratio (image), Industrial and Manufacturing Engineering, Condensed Matter::Soft Condensed Matter, Physics::Fluid Dynamics, Shear stress, Microreactor, media_common
Abstract

Slug flow behavior and characteristics have been studied in a rectangular microchannel with Y-junction. Two simple bubble shape models are proposed to calculate the film thickness, gas hold-up and the specific surface area. The results show a significant effect of inertia on the bubble generation process. The liquid film thickness was greatly thickened by the inertial effect. The main forces on the rupture of the gas bubbles present a shifting from pressure (squeezing regime) to shearing stress and dynamical pressure of the liquid (shearing regime). The transition was found to mainly depend on the liquid velocity. A strong leakage flow of the liquid film around the gas bubbles was suggested as the liquid slug lengths decreased instead when liquid velocity increased. This leakage flow is also the reason of the over-prediction of the bubble velocity based on the stagnant film hypothesis.

Published
2013

9. Process analysis on CO2 absorption by monoethanolamine solutions in microchannel reactors.

Author

Ye, Chunbo, Dang, Minhui, Yao, Chaoqun, Chen, Guangwen, and Yuan, Quan

Subjects
*CARBON dioxide adsorption, *ETHANOLAMINES, *SOLUTION (Chemistry), *MICROREACTORS, *CHEMICAL reactions, *ARRHENIUS equation
Abstract

Highlights: [•] Process of CO2 absorption by MEA solutions was analyzed in microchannel reactors. [•] Effects of relevant parameters on the process were evaluated. [•] k 1 for CO2 reaction with MEA was successfully determined under ambient pressure. [•] An Arrhenius-type equation was obtained for k 1 for CO2 absorption in microchannel. [Copyright &y& Elsevier]

Published
2013
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10. Safe, efficient and selective synthesis of dinitro herbicides via a multifunctional continuous-flow microreactor: one-step dinitration with nitric acid as agent.

Author

Chen, Yizheng, Zhao, Yuchao, Han, Mei, Ye, Chunbo, Dang, Minhui, and Chen, Guangwen

Subjects
HERBICIDES, CHEMICAL synthesis, CONTINUOUS flow reactors, NITRIC acid, MICROREACTORS
Abstract

A continuous and selective method for synthesis of dinitro herbicides through one-step dinitration approach has been successfully developed in microreactor systems. Compared to a conventional two-step batch process, reaction can be conducted without the need to separate intermediates and much less solvent or solvent-free condition has been employed. [ABSTRACT FROM AUTHOR]

Published
2013
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