Startseite A review on empirical correlations estimating gas holdup for shear-thinning non-Newtonian fluids in bubble column systems with future perspectives
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A review on empirical correlations estimating gas holdup for shear-thinning non-Newtonian fluids in bubble column systems with future perspectives

  • Ajay Sujan

    Ajay Sujan is a PhD scholar under the supervision of Dr. Raj K. Vyas, Chemical Engineering Department, MNIT (Jaipur, India). He was a lecturer at the Chemical Engineering Department, Anand Engineering College (Agra, India) from 2010 to 2013. He completed his Master’s degree at MNIT Jaipur. He is currently working on hydrodynamic and mass transfer parameters in a bubble column. He has published a number of articles related to international conferences.

    und Raj K. Vyas

    Raj K. Vyas is an Associate Professor at the Chemical Engineering Department, MNIT (Jaipur, India). He obtained his PhD from the former University of Roorkee, Roorkee (now IIT Roorkee). The major areas of his research are separation processes, environmental engineering, catalysis and biotechnology. He has published/presented over 70 research papers in various international/national journals and conferences of repute, guided five PhDs and 14 Master’s theses. He has received several academic awards including a “Khosla Commendation Certificate” from the University of Roorkee, Roorkee in 1996.

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Veröffentlicht/Copyright: 26. September 2017
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Abstract

Gas holdup is one of the most important parameters for characterizing the hydrodynamics of bubble columns. Modeling and design of bubble columns require empirical correlations for precise estimation of gas holdup. Empirical correlations available for prediction of gas holdup (εG) in various non-Newtonian systems for both gas-liquid and gas-liquid-solid bubble columns have been presented in this review. Critical analysis of correlations presented by different researchers has been made considering the findings and pitfalls. As the magnitude of gas holdup depends on many factors, such as physicochemical properties of gas and/or liquid, column geometry, type and design of gas distributors, operating conditions, phase properties, and rheological properties, etc., all of these have been discussed and examined. In order to emphasize the significance, relative importance of parameters such as flow behavior index, consistency index, column diameter, gas flow rate, and density of aqueous carboxymethylcellulose (CMC) solution on gas holdup has been quantified using artificial neural network and Garson’s algorithm for an experimental data set of air-CMC solution from the literature. Besides, potential areas for research encompassing operating conditions, column geometry, physical properties, modeling and simulation, rheological properties, flow regime, etc., have been underlined, and the need for developing newer correlations for gas holdup has been outlined. The review may be useful for the modeling and design of bubble columns.

About the authors

Ajay Sujan

Ajay Sujan is a PhD scholar under the supervision of Dr. Raj K. Vyas, Chemical Engineering Department, MNIT (Jaipur, India). He was a lecturer at the Chemical Engineering Department, Anand Engineering College (Agra, India) from 2010 to 2013. He completed his Master’s degree at MNIT Jaipur. He is currently working on hydrodynamic and mass transfer parameters in a bubble column. He has published a number of articles related to international conferences.

Raj K. Vyas

Raj K. Vyas is an Associate Professor at the Chemical Engineering Department, MNIT (Jaipur, India). He obtained his PhD from the former University of Roorkee, Roorkee (now IIT Roorkee). The major areas of his research are separation processes, environmental engineering, catalysis and biotechnology. He has published/presented over 70 research papers in various international/national journals and conferences of repute, guided five PhDs and 14 Master’s theses. He has received several academic awards including a “Khosla Commendation Certificate” from the University of Roorkee, Roorkee in 1996.

Nomenclature

Ar

Archimedes number, dimensionless

AC

Acceleration number, dimensionless

CD

Drag coefficient, dimensionless

d

Impeller diameter, m

d0

Sparger hole diameter, mm

dP

Diameter of particle, mm

d32

Sauter mean bubble diameter, m

de

Volume equivalent bubble diameter, m

ds

Sparger diameter, m

DL

Diffusivity, m2/s

DC

Column diameter, m

E

Elasticity or bubble aspect ratio, dimensionless

Eo

Eötvös number, dimensionless

Ga

Galilei number, dimensionless

g

Acceleration of gravity, m/s2

Gʹ

Storage modulus, dimensionless

Gʺ

Loss modulus, dimensionless

H0

Initial liquid height in column, m

HL

Liquid height in column, m

Hc

Height of the column, m

H

Height of measurement location from the sparger, m

k

Consistency index, Pa·sn

Mo

Morton number, dimensionless

n

Flow behavior index, dimensionless

N

Impeller speed, rev/s or rev/min

NH

Number of hidden layer

Nμr

Viscosity ratio

OA

Open area, m2

Pg

Mechanical agitation power input in gas-liquid dispersion, W

P

Pressure, bar or atm

ΔPH

Pressure drop per unit height, kPa/m

Ret

Terminal Reynolds number, dimensionless

ReM

Reynolds number based on the Carreau model, dimensionless

Re

Reynolds number, dimensionless

s

Carreau model parameter, dimensionless

S

Fractional plate free area, dimensionless

T

Temperature, °C or K

uG

Superficial gas velocity, m/s

uL

Superficial liquid velocity, m/s

U

Bubble rise velocity, m/s

VL

Volume of liquid, m3

Wi

Weissenberg number, dimensionless

We

Weber number, dimensionless

x

Largest horizontal dimension

y

Largest vertical dimension

z

Axial location from the sparger level, m

Greek letters
λ

Carreau model parameter, s

λt

Fluid characteristic time, s

εG

Gas holdup, dimensionless

εF

Holdup of floating bubble breakers, dimensionless

μeff

Effective viscosity of liquid, Pa·s

μa

Apparent viscosity, Pa·s

μ0

Zero shear rate viscosity, Pa·s

μ

Infinite shear rate viscosity, Pa·s

μL

Liquid-phase viscosity, Pa·s

ρs

Density of solid particle, kg/m3

ρL

Liquid-phase density, kg/m3

σL

Liquid phase surface tension, N/m

σ

Surface tension, N/m

θ

Taper angle, degree

Subscripts
G

Gas phase

L

Liquid phase

S

Solid phase

Abbreviations
CBDT

Concave bladed disc turbine

CMC

Carboxymethyl cellulose

DT

Flat bladed disc turbine

MOC

Material of construction

MAPE

Maximum average percentage error

OCENOL

A mixture of saturated and unsaturated alcohol from the fraction C16–C18

PPG

Polypropylene glycol

PAA

Polyacrylamide

PVP

Polyvinyl pyrrolidone

PAM

Polyacrylamide

RMSE

Root mean square error

SAG

Silicone antifoam emulsion

SOKRAT

A water-soluble liquid polymer based on acrylonitrile and acrylic acid in ratio 2:1

SS

Stainless steel

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Received: 2016-12-07
Accepted: 2017-08-02
Published Online: 2017-09-26
Published in Print: 2018-11-27

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