The role of gas bubbles and liquid slug lengths on mass transport in the Taylor flow through capillaries

Gas-liquid and liquid-solid mass transfer were studied in capillaries under Taylor flow regime. The influence of the capillary diameter, unit cell length and gas hold-up on measured kLa and kSa coefficients was correlated by simple correlation, which showed that in both cases the mass transport is mostly determined by the liquid slug length and velocity. The results demonstrated that the contribution of the mass transferred in the thin liquid film surrounding the gas bubble is not dominant. The conclusions agreed with the predictions made on the basis of a model developed by means of RTD measurements which were carried out in the same capillaries. The results obtained during catalytic hydrogenation of nitrite ions can also be explained in view of new findings.

[1]  Henrik Pedersen,et al.  Axial dispersion in a segmented gas-liquid flow , 1981 .

[2]  William H. Press,et al.  Numerical Recipes: FORTRAN , 1988 .

[3]  G. Taylor.  Deposition of a viscous fluid on the wall of a tube , 1961, Journal of Fluid Mechanics.

[4]  K. Udell,et al.  A Finite Element Study of Low Reynolds Number Two-Phase Flow in Cylindrical Tubes , 1985 .

[5]  Martin A. Abraham,et al.  Monolith froth reactor: Development of a novel three‐phase catalytic system , 1995 .

[6]  S. G. Mason,et al.  Flow of Entrapped Bubbles through a Capillary , 1960 .

[7]  Bengt Andersson,et al.  Mass transfer and liquid-phase reactions in a segmented two-phase flow monolithic catalyst reactor , 1988 .

[8]  Bengt Andersson,et al.  Solid-liquid mass transfer in segmented gas-liquid flow through a capillary , 1982 .

[9]  Bengt Andersson,et al.  Gas-liquid mass transfer in taylor flow through a capillary , 1992 .

[10]  Bengt Andersson,et al.  Liquid-phase methanol synthesis: modelling of a monolithic reactor , 1993 .

[11]  Fumihide Shiraishi,et al.  Performance of a honeycomb monolith bioreactor in a gas-liquid-solid three-phase system , 1989 .

[12]  H. S. Fogler,et al.  Elements of Chemical Reaction Engineering , 1986 .

[13]  F. Bretherton.  The motion of long bubbles in tubes , 1961, Journal of Fluid Mechanics.

[14]  I. Turunen,et al.  Kinetics of nitrate reduction in monolith reactor , 1994 .

[15]  Said Irandoust,et al.  Finite‐element analysis of Taylor flow , 1996 .

[16]  Martin A. Abraham,et al.  Residence time distribution in three-phase monolith reactor , 1995 .

[17]  Bengt Andersson,et al.  Scaling up of a monolithic catalyst reactor with two-phase flow , 1989 .

[18]  R G Duggleby,et al.  Regression analysis of nonlinear Arrhenius plots: an empirical model and a computer program. , 1984, Computers in biology and medicine.

[19]  O. Levenspiel.  Chemical Reaction Engineering , 1972 .