Flow pattern was visually observed for non‐foaming and foaming Newtonian and non‐Newtonian liquids under concurrent downflow with air in packed beds using different configurations of column geometry and packins. Flow maps delineating the different flow regions were presented based on the present study as well as that of earlier investigations. The total and dynamic liquid saturation were experimentally measured and correlations were presented in terms of (i) the Lockhart‐Martinelli parameter, χ, and (ii) the flow variables. Copyright © 1988 Canadian Society for Chemical Engineering

P Sesha Talpa Sai

Department Of Chemical Engineering

Y. B.G. Varma

CHEMICAL EQUIPMENT - PACKED BEDS

LIQUID SATURATION

TRICKLE BEDS

TWO-PHASE FLOW PATTERNS

Flow of fluids

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

The Canadian Journal of Chemical Engineering

The total and dynamic liquid saturation under concurrent gas-liquid downflow through packed beds were experimentally measured for non-foaming, foaming Newtonian and non-Newtonian liquids. The variables include the column diameter, packing size and shape, flow rate of the phases, and physical properties. Correlations were presented in terms of Lockhart-Martinelli parameter, χ for non-foaming Newtonian and non-Newtonian liquids and in terms of modified Lockhart-Martinelli parameter, χ' for foaming Newtonian liquids.

Bioprocess Engineering

Liquid saturation in concurrent gas-liquid downflow 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.

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

The average in situ volume fraction of the liquid phase for gas‐liquid cocurrent downflow through packed beds is correlated to the input volume fraction of the liquid and the bed geometry. The range of operation is delineated into a high‐interaction regime and a low‐interaction regime based on the influence of the gas rate on the liquid holdup. Experimental data of the present investigation using air‐water and air‐CMC solutions, as well as that reported in literature covering a wide range in variables, are considered in the development of correlations for total and dynamic liquid holdup. Copyright © 1992 Canadian Society for Chemical Engineering

Liquid holdup in gas‐liquid cocurrent downflow through packed beds

Two‐phase pressure drop and dynamic and total liquid saturation are experimentally determined for air‐water system under cocurrent downflow through packed beds using packing differing widely in geometry. The experimental data of the present study as well as that available in literature is satisfactorily correlated in terms of: (a) Lockhart‐Martinelli parameters; and (b) the Reynolds numbers defined for the respective phases and the bed porosity, taking into account the flow behavior of the phases through the packed bed. Copyright © 1983 American Institute of Chemical Engineers

Journal	The Canadian Journal of Chemical Engineering
ISSN	00084034
Open Access	No