Engineering and Technology Journal

Experimental Study of Simultaneous Heat and Mass Transfer in Falling Film and Bubble Mode (LiCl) Absorbers

Kamal M. Ahmad; Orooba .N. Abdullah; Mohammad F. Abid

Volume 30, Issue 4 , February 2012, , Page 529-545

https://doi.org/10.30684/etj.30.4.1

Abstract

The study involves lithium-Chloride absorption process for the falling film and bubble columns absorbers, working at the same operating conditions. The results obtained were used to ... Read More ...

Modeling ofMixing in The Liquid Phase For Bubble Column

Ali H. Jawad

Volume 27, Issue 10 , July 2009, , Page 1992-2007

https://doi.org/10.30684/etj.27.10.8

Abstract

Hydrodynamic characteristics (mixing in the liquid phase) in a bubble column with a non-Newtonian liquid phase (aqueous solutions of carboxymethylcellulose, or CMC, at different concentrations) ... Read More ...

Scale Effects on the Hydrodynamics of Bubble Column

Farah S. Jameel; Mohammad F. Abid

Volume 27, Issue 10 , July 2009, , Page 2142-2164

https://doi.org/10.30684/etj.27.10.18

Abstract

The main object of this study is to investigate the influence of the columngeometric and operating variables ( i.e., column diameter, superficial gas velocityand liquid viscosity) on ... Read More ... The main object of this study is to investigate the influence of the columngeometric and operating variables ( i.e., column diameter, superficial gas velocityand liquid viscosity) on the hydrodynamic parameter ( i.e. , gas holdup, bubbledynamics and liquid phase axial dispersion coefficient ). The experimental dataobtained showed that the gas holdup increases linearly with superficial gasvelocity at both homogeneous and heterogeneous regimes but the rate ofincreasing is slower at the heterogeneous one. The bubble rise velocity was foundto decrease with increasing superficial gas velocity until a transition point wasreached and after that the relationship was linearly increasing. It was observedthat with an increase in liquid phase viscosity and increase in column diameters, adecrease in gas holdup and an increase in bubble size were obtained. It wasobserved that increasing axial position led to an increase in bubble diameter and adecrease in bubble rise velocity. Axial dispersion coefficient which is measuredby tracer response technique was found to increase with gas superficial velocity,increases with column diameter, increases with axial position and decreases withliquid viscosity. This work also presents a theoretical analysis that is used tocalculate the axial dispersion coefficient. The measured axial dispersioncoefficient was generally consistent with the predictions of the well establishedcorrelations from the literature. The validity of the model was settled bycomparing its predication with the objective function of the well-Known empiricalcorrelation formulated by ( Hikita and Kikukawa , 1974) .The comparison showsthat the present model is statistically significant at a 95% confidence level byusing goodness – of – fit test .Also a statstical analysis was performed to get a general correlation for the gasholdup (εg) as a function of the parameters studied:= 0.15325 Fr 0.29617 Ga 0.09223 Bo -0.0424 g eWhere the correlation coafficient ( R ) was equal to ( 0.957) and the absoluteerror (3.5%).

Characteristics of Bubbles and Gas Holdup In A Two-Phase Column For Different Liquid Phases

Auroba. Nafaa. Abdullah

Volume 25, Issue 2 , April 2007, , Page 282-290

https://doi.org/10.30684/etj.25.2.16

Abstract

Experimental study of gas holdup (Eg), bubble diameter (dvs) interfacial area(a) m-1, small bubble rise velocity (Ubs), and bubble rise velocity (Ubr) in (0.1mi.d) and (1.5m) high column ... Read More ...

Effect Of Solid Catalyst On Bubble Rise Velocity And Gas- Drift Flux In Three-Phase-Columns

Kamal Mohammad Ahmad

Volume 25, Issue 1 , March 2007, , Page 97-102

https://doi.org/10.30684/etj.25.1.10

Abstract

The bubble rise velocity and drift flux were measured in 0.051 m i.d glass column with ethanol as the liquid phase, cobalt catalyst as the solid phase in concentration varying from ... Read More ...

Keywords = Bubble column

Experimental Study of Simultaneous Heat and Mass Transfer in Falling Film and Bubble Mode (LiCl) Absorbers

Abstract

Modeling ofMixing in The Liquid Phase For Bubble Column

Abstract

Scale Effects on the Hydrodynamics of Bubble Column

Abstract

Characteristics of Bubbles and Gas Holdup In A Two-Phase Column For Different Liquid Phases

Abstract

Effect Of Solid Catalyst On Bubble Rise Velocity And Gas- Drift Flux In Three-Phase-Columns

Abstract