Dispersed phase holdup was measured in a pulsed plate column for the kerosene‐water system under binary conditions and under solute transfer from dispersed to continuous and continuous to dispersed phases. The experimental data were satisfactorily modelled through a recirculation regime model. The drop size distribution, measured by a photographic technique, exhibited a multinodal character at low agitation rates and high dispersed phase flow rate. Sauter mean drop diameter was found to depend on the agitation rate, the dispersed phase flow rate, the mass transfer direction and the plate free area. Correlations for d32 and the interfacial area were presented using Kolmogoroff's isotropic turbulence model. Copyright © 1988 Canadian Society for Chemical Engineering

Y. B.G. Varma

FLOW OF FLUIDS - Turbulent

FLUID DYNAMICS - Mathematical Models

LIQUIDS - DROP FORMATION

MASS TRANSFER - MEASUREMENTS

DISPERSED PHASE HOLDUP

Drop size distribution

PULSED PLATE COLUMNS

RECIRCULATION REGIME MODEL

SAUTER MEAN DROP DIAMETER

CHEMICAL EQUIPMENT

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

Drop size distributions, mean drop diameter and slip velocity are experimentally studied in a reciprocating plate column. The correlations for the above are presented in terms of plate geometry, flow rates of phases and physical properties of the system covering a wide range in experimental conditions.

Bioprocess Engineering

A correlation for drop size and slip velocity in reciprocating plate column

A comprehensive study of the influence of plate geometry and the added packing on the holdup and slip velocity in reciprocating plate columns is presented. The use of packing in the interplate spaces of the column is of interest as packing alters the character of dispersion and also provides contact area for the phases. A model is proposed relating slip velocity to the single drop rise velocity taking into consideration the pseudohydrostatic effects and particle-to-particle interaction effects.

Influence of plate geometry and added packing on dispersed phase holdup and slip velocity in reciprocating plate column

Liquid-liquid mass transfer has been experimentally studied for the kerosene (dispersed)-water (continuous) system in a reciprocating-plate column, using benzoic acid and n-butyric acid as solutes. The effect of the flow rates of the phases, the agitation rate of the plate stack, the perforation diameter and free area of the plate and the mass transfer direction have been investigated. Correlations for volumetric and mass transfer coefficients have been proposed in terms of power dissipation rate and the physical properties of the system. The mass transfer coefficient is compared with the predictions of the drop models to establish the extent of internal mobility of the dispersed phase droplets. © 1994.

The Chemical Engineering Journal and The Biochemical Engineering Journal

Liquid-liquid mass transfer in a reciprocating-plate column

Mass transfer for kerosene-water system with benzoic acid and n-butyric acid as solutes has been studied in a reciprocating plate column at different operating conditions including the agitation rate of the plate stack, the plate geometry, the flow rates of the phases and the direction of mass transfer. Apparent and true concentration profiles for the dispersed and the continuous phase along the length of the column were generated, taking axial mixing of the phase into consideration. It is noticed that high agitation rate for the plate stack and low free area for the plate give rise to large difference between the apparent and true values. These observations also agree with the data obtained for carbon dioxide - water system studied in a reciprocating plate column. © 1993 Springer-Verlag.

Apparent and true longitudinal concentration profiles in reciprocating plate column

Dispersed phase holdup and the bubble size distribution were measured in a reciprocating plate column under cocurrent upflow and countercurrent flow of gas and liquid phases. The response of the system to a variation in design and operating conditions was found similar to that for liquid–liquid contacting; the magnitude of response, however, differed significantly between them. Taking into consideration the dominant forces encountered in gas–liquid dispersions, the experimental data are satis–factorily correlated in terms of Froude, Weber and Gallileo numbers. Copyright © 1990 Canadian Society for Chemical Engineering

Dispersed phase holdup and bubble size distributions in gas–liquid cocurrent upflow and countercurrent flow in reciprocating plate column

The paper covers an experimental and theoretical investigation of the dispersed phase holdup and drop size distribution for gas‐liquid and liquid‐liquid counter‐current flow in reciprocating plate columns provided with plates having small hole size and free area. The response of the reciprocating plate column is similar to that of liquid‐pulsed columns exhibiting mixer‐settler and emulsion regions. The dispersed phase holdup depends on the dispersed phase flow rate, the vibrating speed of the plate stack, the plate geometry and the number of plates: it was found to be minimum at the transition between the mixer‐settler and emulsion regions. The dispersed phase holdup is modeled incorporating apparent interstitial liquid velocity and the slip velocity to account for the non‐descriptive flow pattern between the phases. The drop size distribution is satisfactorily represented on a Rosin–Rammler Chart. Sauter mean diameter, calculated from the distributions, indicated an advantage in the drop size‐power consumption relation when plates having small hole size and free area are used. Equipment used for fluid‐fluid contacting is often broadly classified as either stagewise or differential contactors. The classification is further sub‐divided as gravity, mechanically‐agitated and pulse‐agitated, depending on the method adopted for interdispersing the phases. Pulse‐agitation involves the use of either reciprocating perforated plates moving vertically up and down the column, or pulsing a phase hydraulically keeping the internal structure of the column stationary. The literature on reciprocating plate columns (RPC) primarily is concerned with the study of liquid‐liquid systems using perforated plates having large hole size and free area. This paper presents the dispersed phase holdup and drop size distributions for gas‐liquid and liquid‐liquid systems in reciprocating plate columns with small perforation diameter and free area for the plate. Copyright © 1983 Canadian Society for Chemical Engineering

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