Results 141 to 150 of about 2,370 (195)

Holdup in Vertical Three Phase Flow

Developments in Chemical Engineering and Mineral Processing, 1999
AbstractVertical three phase air‐water‐oil data in a. 0.026 m i.d. pipe were presented. The liquid holdup data presented as a complex pattern against f0 the oil liquid volumetric ratio for annular flow at one value of total superficial liquid velocity.
G. S. Woods, P. L. Spedding, J. K. Watterson, R. S. Raghunathan   +3 more
openaire   +1 more source

Phase holdup characteristics of three phase fluidized beds

The Canadian Journal of Chemical Engineering, 1975
AbstractThe individual phase holdups in two (liquid‐air, liquid‐solids) and three (liquid‐air‐solids) phase fluidized beds have been measured over a wide range of liquid and gas velocities. Ex‐periments were canied out in a large two‐dimensional bed. Three solids were used ranging in size from 1 to 6 mm.The effect of viscosity (1‐70 cp) was determined ...
Kim, Sang Done, Baker, C.G.J., Bergougnou, M.A.   +2 more
openaire   +1 more source

Effect of internal on phase holdups of a three-phase fluidized bed

Chemical Engineering Journal, 2009
Abstract Individual phase holdups are important dynamic parameters in the designing of three-phase fluidized bed systems. The system chosen for the present study is nitrogen as gaseous phase, an electrolyte as liquid phase and glass balls as solid phase. The gas holdup was obtained from pressure drop measurements.
K.V. Ramesh, G.M.J. Raju, G.V.S. Sarma, C. Bhaskara Sarma   +3 more
openaire   +1 more source

Holdup characteristics of two-phase parallel microflows

Microfluidics and Nanofluidics, 2013
Two-phase parallel microflows, i.e., stratified flow and core-annular flow, have many applications in lab-on-chip devices. These include transport and reaction processes, such as liquid–liquid extraction and phase transfer catalysis. The phase holdup (fraction of the microchannel volume occupied by a specified phase) is a key parameter of these flow ...
Anil B. Vir, Shekhar R. Kulkarni, J. R. Picardo, Avinash Sahu, S. Pushpavanam   +4 more
openaire   +1 more source

GAS-PHASE HOLDUP IN A SLURRY-BUBBLE COLUMN

Chemical Engineering Communications, 1997
Abstract Total and sectional gas-phase holdups are measured in a wide (0.305 m internal diameter) and long (3.7 m) glass bubble column al ambient conditions as a function of superficial gas velocity. Sectional gas holdup values vary along the length of the column and decrease as the height above the gas distributor plate increases in the transitional ...
J. W. ZHU, V. H. TRIVEDI, S. C. SAXENA
openaire   +1 more source

PREDICTION OF GAS-PHASE HOLDUP IN A BUBBLE COLUMN

Chemical Engineering Communications, 1997
Hydrodynamic properties of bubble columns play a significant role in many chemical and biochemical processes. Recent theoretical and experimental work conducted by Krishna et al. (1991, 1994), and Wilkinson et al. (1992) have been examined in conjunction with a bubble column and data for the air-water system operating at ambient conditions.
J. W. ZHU, S. C. SAXENA
openaire   +1 more source

Ultrasonic technique for dispersed-phase holdup measurements

Industrial & Engineering Chemistry Research, 1987
Mesure du temps de transit d'un train de pulsations ultrasonores, dans une colonne d'extraction liquide-liquide. Un modele de moyenne temporelle permet d'evaluer la retenue de la phase dispersee a partir du temps de transmission global des pulsations sonores.
J. C. Bonnet, L. L. Tavlarides
openaire   +1 more source

Distributions of flow regimes and phase holdups in three-phase fluidized beds

Chemical Engineering Science, 1995
Abstract Pressure fluctuation characteristics at different axial and radial positions were investigated in a three-phase fluidized-bed Plexiglas column of 285 mm inside diameter and 4100 mm height operated with air, tap water and glass beads under different conditions. It was found that the whole column may display different flow regimes depending on
Zumao Chen, Chong Zheng, Yuanding Feng, Hanns Hofmann   +3 more
openaire   +1 more source

Phase holdups in three-phase fluidized beds in the presence of disc promoter

Experimental Thermal and Fluid Science, 2011
Abstract Three-phase fluidized beds are found to have wide applications in process industries. The present investigation essentially comprises of the studies on gas holdup, liquid holdup and bed porosity in three-phase fluidized beds with coaxially placed disc promoter.
M.S.N. Murty, K.V. Ramesh, G. Prabhakar, P. Venkateswarlu   +3 more
openaire   +1 more source

Phase Holdups in Three-Phase Semifluidized Beds and the Generalized Bubble Wake Model

Industrial & Engineering Chemistry Research, 2009
A new experimental measurement methodology was proposed to characterize the hydrodynamics in gas−liquid−solid semifluidized beds. Using pressure drop measurements in the lower fluidized bed section and a tracer response technique in the upper fixed bed portion, the six phase holdup components of the reactor were determined simultaneously.
Schubert, M., Larachi, F.
openaire   +2 more sources