Pressure‐drop in cocurrent gas‐liquid downflow through packed beds was experimentally measured for nonfoaming, foaming Newtonian, and non‐Newtonian liquids. The variables include the column diameter, packing size and shape, flow rates of the phases, and their physical properties. Unified correlations are presented for the data of the present study as well as data available in literature in terms of Lockhart‐Martinelli parameters and flow variables and packing characteristics. The data were modeled using a dynamic interaction model. Copyright © 1987 American Institute of Chemical Engineers

P Sesha Talpa Sai

Department Of Chemical Engineering

Y. B.G. Varma

Chemical Reactions - Hydrogenation

ENZYMES - Immobilization

Gases

HYDROGEN PEROXIDE - PRODUCTION

Liquids

BUTYNEDIOL

DYNAMIC INTERACTION MODEL

FLOW VARIABLES

GAS-LIQUID DOWNFLOW

LOCKHART-MARTINELLI PARAMETERS

Flow of fluids

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AIChE Journal

A macroscopic model for pressure drop and liquid saturation in cocurrent gas-liquid upflow through packed beds was proposed. The three model parameters: two accounting for the effect of reduction in cross sectional area available for each phase due to the presence of the other, the third accounting for the effect of bubble formation were evaluated from the experimental data of the earlier investigation. The validity of the model for predicting the pressure drop was tested with an independent data reported in literature. © 2002 Elsevier Science B.V. All rights reserved.

Chemical Engineering Journal

A model for pressure drop and liquid saturation in gas-liquid cocurrent upflow through packed beds

Correlations for pressure drop in gas-liquid cocurrent downflow through packed beds are presented, taking into cognizance the flow pattern of the phases and covering a wide range in experimental conditions. Criteria for flow regime discrimination are presented separately for low porosity and for high porosity packings. © 1995 Springer-Verlag.

Bioprocess Engineering

Flow pattern and pressure drop in gas-liquid cocurrent downflow through packed beds

Interfacial area in cocurrent gas-liquid downflow through packed beds is correlated taking into consideration the physical properties of the fluids and the power dissipation in the system. The correlation is tested with the experimental data covering a wide range in system variables including low and high porosity packings, the flow rates of the phases and their physical properties. © 1994 Springer-Verlag.

A correlation for interfacial area in co-current gas-liquid downflow through packed beds

A model for pressure drop is proposed for gas-liquid flow through packed beds on the basis of the observed absence of radial pressure gradients and taking into consideration the structure of the bed and the physical properties of the fluids. The model divides the total voitage of the bed into internal and external voidage and appropriately distributes the total liquid holdup into internal and external holdup. Over 2500 experimental data, from the present study as well as those reported in literature, are correlated by the model with an r.m.s. deviation of less than ±9%. The significant parameters affecting the two-phase pressure drop are found to be the bed porosity, the Reynolds number, and the product of the Eötvos and the Morton numbers. © 1993.

The Chemical Engineering Journal

A model for the pressure drop in gas-liquid cocurrent downflow through packed beds

Pressure drop and liquid saturation are two important design parameters in cocurrent gas‐liquid downflow through packed beds. A macroscopic model based on momentum balance is formulated for the condition of no radial pressure gradients. The model includes the effect of bubble formation on the pressure drop and holdup and is compared with the experimental data of the earlier investigators and of the present study. The model provides a functional form for correlating pressure drop and liquid saturation but some parameters have to be determined by fitting the experimental data. Copyright © 1983 American Institute of Chemical Engineers

Journal	AIChE Journal
ISSN	00011541
Open Access	No