Results 151 to 160 of about 2,370 (195)

Measurement of Local Phase Holdups in a Two- and Three-Phase Bubble Column

Chemical Engineering & Technology, 2000
A new invasive sensing probe for the measurement of local phase holdups in two- and three-phase reactors is described. The local gas and solids holdups in a bubble column with a volume of V=2 m 3 at varying operating conditions (gas velocity, sparger design, solids content and density) are measured by means of differential pressure measurement in ...
H. Dziallas, V. Michele, D. C. Hempel
openaire   +1 more source

One-dimensional modelling of phase holdups in three-phase stratified flow

International Journal of Multiphase Flow, 1997
Abstract This paper reports an investigation of the application of the three-fluid model to estimate phase holdups in three-phase stratified flow. A computer code (PRESBAL) was developed and used to apply the three-fluid model with a variety of assumptions regarding modelling of wall and interface shear stresses. Alternative definitions of equivalent
S.H. Khor, M.A. Mendes-Tatsis, G.F. Hewitt   +2 more
openaire   +1 more source

Fluid maldistribution effects on phase holdups in three-phase fluidized beds

Chemical Engineering Science, 2001
Abstract Effects on the phase holdups and overall bed voidage of gas and liquid maldistribution due to partial blockage of the distributor and due to their premixing below the distributor have been determined for three-phase fluidized beds in a 127-mm-diameter column.
DongHyun Lee, Arturo Macchi, John R Grace, Norman Epstein   +3 more
openaire   +1 more source

PHASE HOLDUPS AND LIQUID-LIQUID EXTRACTION IN THREE PHASE FLUIDIZED BEDS

Chemical Engineering Communications, 1988
Abstract Effects of the continuous phase velocity (0.01-0.08 m/s(, the dispersed phase velocity (0.0-0.04 m/s) and particle size (1.0-3.0 mm) on the individual phase holdups and the mass transfer coefficient have been determined in two (liquid-liquid) and three (liquid-liquid-solid) phase fluidized beds.
SANG DONE KIM, YONG HO YU, POONG WOO HAN
openaire   +1 more source

Gas holdup in a three-phase magneto-fluidized bed

Chemical Engineering Science, 1999
The influence of magnetic field on local gas holdup, e g and average gas holdup e g has been studied in a three-phase (gas-liquid-solid) magneto-fluidized bed using electroresistivity probe technique and quick closing valve technique, respectively.
R.L. Sonolikar, G.V. Butley, S. Pentu Saheb   +2 more
openaire   +1 more source

A mechanistic model for phase holdup predictions in a three-phase fluidized bed

Chemical Engineering Science, 1991
Abstract A mechanistic model developed based on modification of the concept underlying the classical wake model (CWM), more specifically the generalized wake model, is presented to account for the phase holdup behavior in gas—liquid—solid fluidized beds.
Rong-Her Jean, Liang-Shih Fan
openaire   +1 more source

Ultrasonic Technique For Measuring Phase Holdups In Multiphase Systems

Chemical Engineering Communications, 2005
ABSTRACT An ultrasonic technique is being developed to detect the dispersed phase holdups in multiphase systems. This technique is based on the fact that the transmission time and attenuation of ultrasound in suspensions differ from those in pure liquids.
MAYTINEE VATANAKUL, YING ZHENG, MICHEL COUTURIER   +2 more
openaire   +1 more source

Local phase holdups in gas‐solids fluidization and transport

AIChE Journal, 2001
AbstractA two‐phase structural model consisting of a dense phase and a dilute phase with allowance for the dense‐phase expansion and the solids holdup in the dilute phase was developed and successfully applied to the analysis of local voidage fluctuation signals.
Hsiaotao T. Bi, Peng‐Cheng Su
openaire   +1 more source

Gas holdup in a three-phase fluidized-bed bioreactor

Applied Biochemistry and Biotechnology, 1990
The effects of system parameters on the gas holdup in a three-phase fluidized-bed bioreactor were examined. A valve technique was used to measure the average gas holdup in the reactor. Gas holdup was found to be strongly affected by fluid superficial velocities, bead size and density, electrolyte concentration, type of gas sparger, and temperature ...
M. J. Bly, R. M. Worden
openaire   +1 more source

Holdup of the liquid slug in two phase intermittent flow

International Journal of Multiphase Flow, 1985
Abstract A physical model for the prediction of gas holdup in liquid slugs in horizontal and vertical two phase pipe slug flow is presented. This model can also be used to yield the transition between elonganted bubbles and slug flow within the intermittent flow pattern.
Dvora Barnea, Neima Brauner
openaire   +1 more source