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.

P Sesha Talpa Sai

Department Of Chemical Engineering

H. Sindhu

BUBBLE FORMATION

Mathematical models

Pressure drop

Saturation (materials composition)

GAS-LIQUID CONCURRENT UPFLOW

Packed beds

COUNTERCURRENT FLOW

GAS-LIQUID TWO-PHASE FLOW

Packed bed

Two-phase flow

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IIT Madras

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

Chemical Engineering Journal

Bubble flow, pulse flow and spray flow are the identified flow regimes for cocurrent upflow of air and water through a bed of ceramic spheres. Criteria for transition from one regime to another are presented. Pressure drop for the two phase flow is experimentally measured and the two phase friction factor is correlated as f = KRe(g)mRe1(-n) (d(p)/d(c))1.5 where (m, n) are respectively (0.18, 1.7), (0.26, 1.7) and (1.12, 1.82) corresponding to bubble flow, pulse flow and spray flow regimes.

Bioprocess Engineering

Flow regime identification and pressure drop in cocurrent gas-liquid upflow through packed beds

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

AIChE Journal

Pressure drop in gas‐liquid 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

Hydrodynamics of two‐phase cocurrent downflow through packed beds. Part I. Macroscopic model

An analysis of phase holdup in concurrent gas liquid upflow through packed beds using (I) drift-flux model, and (II) slip ratio

Chemical Engineering Science

Liquid saturation in cocurrent upflow fixed-bed reactors: a state-of-the-art correlation

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

Journal	Chemical Engineering Journal
ISSN	13858947
Open Access	No