scholarly journals Mass transfer between particles and liquid in solid-liquid two-phase upflow in the low-velocity region through vertical tubes.

1981 ◽  
Vol 14 (6) ◽  
pp. 489-491 ◽  
Author(s):  
HIROYASU OHASHI ◽  
TAKUO SUGAWARA ◽  
KEN-ICHI KIKUCHI
Keyword(s):  
Mass Transfer ◽  
Low Velocity ◽  
Two Phase ◽  
Solid Liquid ◽  
Vertical Tubes ◽  
Velocity Region

scholarly journals MASS TRANSFER BETWEEN PARTICLES AND LIQUID IN SOLID-LIQUID TWO-PHASE UPFLOW IN VERTICAL TUBES

1979 ◽  
Vol 12 (3) ◽  
pp. 190-195 ◽  
Author(s):  
HIROYASU OHASHI ◽  
TAKUO SUGAWARA ◽  
KEN-ICHI KIKUCHI ◽  
TOSHIO HENMI
Keyword(s):  
Mass Transfer ◽  
Two Phase ◽  
Solid Liquid ◽  
Vertical Tubes

scholarly journals Mass transfer between particles and liquid in solid-liquid two-phase flow through horizontal tubes.

1982 ◽  
Vol 15 (4) ◽  
pp. 311-313 ◽  
Author(s):  
HIROYASU OHASHI ◽  
TAKUO SUGAWARA ◽  
KEN-ICHI KIKUCHI ◽  
MORITO TAKEDA
Keyword(s):  
Mass Transfer ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Horizontal Tubes ◽  
Flow Through ◽  
Solid Liquid

Analysis of Hydrodynamics and Mass Transfer of Gas-Liquid and Liquid-Liquid Taylor Flows in Microchannels

2019 ◽  
pp. 1-49
Author(s):  
Rufat Abiev
Keyword(s):  
Mass Transfer ◽  
Point Of View ◽  
Process Conditions ◽  
Two Phase ◽  
Physical Point ◽  
Micro Channels ◽  
Liquid Systems ◽  
Simplifying Assumptions ◽  
Liquid Flows ◽  
Solid Liquid

Analysis of hydrodynamics and mass transfer Taylor flows in micro channels of both gas-liquid and liquid-liquid systems on the basis of classical theoretical approach with some simplifying assumptions was performed. Results of theoretical analysis for description of hydrodynamic parameters and mass transfer characteristics were confirmed by comparison with the author's own and available in literature experimental data. It was shown that the main parameters of two-phase Taylor flows could be quite precisely described theoretically: mean bubble/droplet velocity, liquid film thickness, real gas holdup (which is always smaller than so-called dynamic holdup), pressure drop. Peculiarities of liquid-liquid flows compared to gas-liquid Taylor flows in capillaries are discussed. Wettability effect on hydrodynamics was examined. Tools of mass transfer intensification of gas-liquid and liquid-liquid Taylor flow in micro channels are analyzed. Three-layer model for heat and mass transfer has been proposed and implemented for the case of solid-liquid mass transfer for gas-liquid Taylor flows; optimal process conditions for this process are found theoretically and discussed from physical point of view.

Study on Ignition and Weak Flame in Heated Meso-Scale Channel

2007 ◽  
Author(s):  
Yosuke Tsuboi ◽  
Takeshi Yokomori ◽  
Kaoru Maruta
Keyword(s):  
Mass Transfer ◽  
Flow Velocity ◽  
Flame Temperature ◽  
Stable Solution ◽  
Flame Speed ◽  
Low Flow ◽  
Low Velocity ◽  
Detailed Chemistry ◽  
Velocity Region ◽  
Meso Scale

If the flame temperature and the reaction speed can be controlled arbitrarily, it is of great help for energy saving through effective utilization of heat generated by combustion. In order to examine the possibility of such mild or moderate combustion, we tried to identify possible weakest flames experimentally with heated meso-scale channel, that is, combustion with controlled heat balance. Results show that the lowest flame speed may exist even though heat loss is compensated by the external heating. For the case of low flow velocity condition, the temperature difference between heated channel wall surface and flame measured by using thermocouple became smaller and smaller with decreasing flow velocity. It implies that there is the lowest flame temperature which corresponds to ignition temperature. To further examine existence and its mechanism of the lowest flame speed, 1-D computations with detailed chemistry were conducted. Computational results show a limit of stable solution in the low velocity region as well as experimental results. Furthermore, diffusive mass transfer was dominant compared to convective mass transfer in the low velocity region. It is probably related to the existence of the lowest flame speed, since the radical species, which is vital for chain reaction, diffuse out from reaction zone.

Absorption in vertical stream tubes with swirl bodies

1983 ◽  
Vol 48 (3) ◽  
pp. 854-860
Author(s):  
Kurt Winkler ◽  
František Kaštánek ◽  
Freimut Storz ◽  
Jan Kratochvíl ◽  
Antonín Havlíček
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Mixing Conditions ◽  
Two Phase ◽  
Liquid Load ◽  
Interfacial Areas ◽  
Experimental Values ◽  
Superficial Gas Velocity ◽  
Vertical Tubes

The absorption of oxygen from air into water has been measured in vertical tubes with swirl bodies in the inlet part. The tubes were of 70 mm I.D. and of height H with diameter ratio H/D ≦ 22. The two-phase flow was directed upward. Superficial gas velocity was ωG = 10 to 35 m s-1 and specific liquid load QLE = 13 to 80 m3m-2h-1. Values of the liquid-side mass transfer coefficient were determined as ratios of experimental values of volumetric mass transfer coefficient and specific interfacial areas, which were measured earlier. Murphree efficiencies were obtained with experimentally determined Peclet numbers considering the real mixing conditions of the liquid phase.

Mass transfer considerations in solid-liquid two-phase partitioning bioreactors: a polymer selection guide

2015 ◽  
Vol 90 (8) ◽  
pp. 1391-1399 ◽  
Author(s):  
Margaret J Pittman ◽  
Michael W Bodley ◽  
Andrew J Daugulis
Keyword(s):  
Mass Transfer ◽  
Two Phase ◽  
Phase Partitioning ◽  
Solid Liquid
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