Results 161 to 170 of about 2,370 (195)

Study of gas holdup for bubble column at three phases

AIP Conference Proceedings, 2018
The gas holdup of bubble column reactor is an important step to designing an efficient slurry reactor for large-scale conversion of synthesis gas to liquid hydrocarbons. Gas holdup considered a main variable affecting the reaction rate of gas-to-liquid (GTL) conversion.
Laith A. Hameed, Omar Muhammad, Sarah Saad, Omar S. Dahham, N. Z. Noriman, Z. Shayfull   +5 more
openaire   +1 more source

A Production Logging Measurement of Distributed Local Phase Holdup

European Production Operations Conference and Exhibition, 1996
Abstract This paper describes early UKCS experience of a new production logging sensor, the Digital Entry and Fluid Imager, or DEFT* tool. Deviated and horizontal wells can cause complex flow regimes to arise that render interpretation of conventional production logging sensors difficult or sometimes impossible.
F.R. Halford, S. Mackay, S. Barnett, J.S. Petler   +3 more
openaire   +1 more source

HYDRODYNAMICS OF UNBAFFLED BUBBLE COLUMNS: GAS-PHASE HOLDUP

Chemical Engineering Communications, 1999
Abstract Gas-phase holdup is measured in a 0·305 m diameter bubble column at ambient temperature and pressure as a function of superficial gas velocity. An air-water system is investigated for two values (1.35  m and 2.45  m) of the slumped water column height and air velocity in the range 0–0·3  m/s.
J. W. ZHU, S. C. SAXENA
openaire   +1 more source

Use of ultrasound for phase holdup measurements in multiphase systems

The Canadian Journal of Chemical Engineering, 2001
AbstractThis study evaluates ultrasound as a non‐invasive technique for determining the cross‐sectional holdups of multiphase systems. Experiments are performed in a column of 292 mm inner diameter with air, water and uniform glass beads of 1.3 mm diameter as the particles.
Arturo Macchi, John R. Grace, Hsiaotao Bi   +2 more
openaire   +1 more source

Liquid Holdup Correlations for Inclined Two-Phase Flow

Journal of Petroleum Technology, 1983
Summary Liquid holdup behavior in two-phase inclined flow was studied in an inclined pipe-flow simulator. Two sets of empirical equations, one each for uphill and downhill flow, are presented. For downhill stratified flow, a third equation is presented.
Hemanta Mukherjee, James P. Brill
openaire   +1 more source

Dispersion and holdup in a three-phase fluidized-bed bioreactor

Applied Biochemistry and Biotechnology, 1989
Axial dispersion and phase holdup measurements were made using electroconductivity in a fermenting fluidized-bed bioreactor (FBR) and in a model nonfermenting three-phase FBR. Multiple axial conductivity probes were used to nonintrusively monitor the bed conductivity.
openaire   +1 more source

DISPERSED PHASE HOLDUP IN PULSED PERFORATED PLATE COLUMNS

Solvent Extraction and Ion Exchange, 1990
ABSTRACT Data on dispersed phase holdup are presented for a range of aqueous-organic systems, and are used to assess the accurancy of existing methods for its prediction. The Griffith model (2) for the mixer-settler region and the Thornton correlation (3) for the dispersion region were found to be the most accurate for high interfaclal tension systems;
Leanne M. Prvcic, H.R. Cllve Pratt, Geoffrey W. Stevens   +2 more
openaire   +1 more source

Gas phase holdup in slurry bubble columns for two- and three-phase systems

The Chemical Engineering Journal, 1992
Abstract Experimental air holdup data are reported for air-water and air-water-glass bead systems. The data are obtained as a function of superficial air velocity, dispersion temperature and slurry concentration of glass bead powders of different average diameters. The bubble column employed in this work is 0.305 m in diameter and is equipped with 19
S.C. Saxena, N.S. Rao, P.R. Thimmapuram
openaire   +1 more source

Effect of surface-active agents on the phase holdups of three-phase fluidized beds

Chemical Engineering and Processing: Process Intensification, 2006
Experiments were performed at ambient temperature and pressure in a 127-mm inner diameter column with air, 1.2 and 5-mm spherical glass beads and various aqueous solutions containing surface-active agents. Perforated plates were employed as the gas and liquid distributors. Gas and liquid velocities were chosen to span the dispersed and coalesced bubble
Puneet Dargar, Arturo Macchi
openaire   +1 more source

Dispersed‐phase holdup in a rotating disk extraction column

AIChE Journal, 1961
AbstractA study has been made of the effect of column geometry and flow condition upon the dispersed‐phase holdup in an rotating disk type of extraction column. Variables investigated were stator opening, disk diameter, compartment height, rotor speed, and flow rates of the dispersed and continuous phases.
E. Y. Kung, R. B. Beckmann
openaire   +1 more source