Results 221 to 230 of about 81,208 (258)

On-Line Gas Hold-Up Measurement in Flotation Columns

Canadian Metallurgical Quarterly, 1999
AbstractGas hold-up is considered as one of the variables directly associated with flotation kinetics. This paper presents a new gas hold-up sensor based on measurements of electrical conductivity and Maxwell's relation for dispersions. The method consists of measuring the conductivity of the three phase dispersion using two conductivity cells, one ...
R. Pérez-Garibay, R. De Villar
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Gas hold-up and solids hold-up in flotation columns: on-line measurement based on electrical conductivity

Mineral Processing and Extractive Metallurgy, 2002
AbstractElectrical conductivity measurements in solid-liquid and solid-liquid-gas dispersions have proven suitable for determination of the volumetric fraction of the phases, or hold-up. A combination of estimation routines was applied to determine the gas hold-up and solids hold-up on line in a flotation column.
F. J. Tavera, R. Escudero
openaire   +1 more source

Mixing characteristics and gas hold‐up of a bubble column

The Canadian Journal of Chemical Engineering, 1986
AbstractThe hydrodynamic behavior of a bubble column has been studied for various Newtonian and non‐Newtonian liquids (water, glycerol, carboxymethylcellulose and polyacrylamide solutions). The mixing time, the power consumption, the circulation time and the gas hold‐up have been measured in a cylindrical column (diameter: 0.254 m, height: 0.9 m) for ...
C. Guy, P. J. Carreau, J. Paris
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Gas hold-up in external-loop airlift bioreactors

Bioprocess Engineering, 1995
A new model of gas hold-up is proposed for external-loop airlift bioreactors. It is based on the similarity between the liquid circulation due to the local variation of gas hold-up in airlift bioreactors and the natural convection due to temperature difference.
Y. Kawase, M. Tsujimura, T. Yamaguchi
openaire   +1 more source

Hold-Up by Natural Gas Transit Countries

SSRN Electronic Journal, 2010
This work in progress considers the bargaining options of a natural gas transit country. The paper describes the situation with potential hold-up due to asset specific investments and the timing of the hold-up by the transit country.
openaire   +1 more source

Power consumption and gas hold-up in a pulsed column

Chemical Engineering Science, 1967
Abstract A resonant air-pulsed water column has been developed for gas absorption experiments: its internal diameter is 3 in. and the effective inertial length of oscillating column is 14·17 ft. The amplitude is up to 6 in. at frequencies from 0·9 to 1·4 c/s and experiments have been carried out with the column unpacked, packed with random 1 2
M.H.I. Baird, J.H. Garstang
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Gas and liquid hold-up in three-phase fluidisation

Chemical Engineering Science, 1975
The paper considers the problems of predicting and correlating gas and liquid hold-ups in three-phase fluidised beds. It is proposed that Stewart's model, which contains a single unknown parameter k (the mean liquid-wake/bubble volume ratio in the bed), should be used in conjunction with Wallis' drift flux approach.
R.C. Darton, D. Harrison
openaire   +1 more source

GAS HOLD-UP IN GAS-LIQUID CONTACTORS AGITATED BY PITCHED BLADE TURBINES

Chemical Engineering Communications, 2001
Abstract Fractional gas hold-up in air- water systems agitated by pitched four-blade upflow turbines was measured using the overflow method. The experiments were carried out in a 0.19 m i.d. vessel stirred by impellers having diameters of 0.31 D to 0.53 D. The blade width and the blade length were 0.25 d and 0.375 d respectively.
JOANNIS MARKOPOULOS, STAVROULA ALEXIOU
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Fractional gas hold‐up in gas inducing type of mechanically agitated contactors

The Canadian Journal of Chemical Engineering, 1996
AbstractFractional gas hold up was measured in gas inducing type of mechanically agitated contactors (GIMAC) with single and multiple impellers. Three vessels of 0.57, 1.0 and 1.5 m i.d. were used. For the multiple impeller system, six different impeller designs were employed. The impeller speed was varied in the range of 0.30 to 15.45 s−1.
K. Saravanan, J. B. Joshi
openaire   +1 more source

On the gas expansion and gas hold-up in vertical slugging columns—A simulation study

Chemical Engineering and Processing: Process Intensification, 2008
Abstract A study on the gas phase expansion and gas hold-up occurring in free bubbling vertical slug flow is reported. A slug flow simulator (SFS) supported by air–water experimental data was used for this purpose. The study was accomplished by implementing in the simulator the gas phase expansion along the column.
T.S. Mayor, A.M.F.R. Pinto, J.B.L.M. Campos   +2 more
openaire   +1 more source