Results 261 to 270 of about 3,203 (299)

Gas holdup in a gas-liquid-solid reciprocating plate column

The Canadian Journal of Chemical Engineering, 1993
The presence of solid particles at lower contents (up to 6% by volume) caused an increase in the gas holdup in the three-phase reciprocating plate column, compared to that in the two phase (gas-liquid) column of the same type, under the same other operating conditions. The decrease in the gas holdup, which was normally observed in the two-phase column,
D. U. Skala, V. V. JanjiĆ, V. B. VeljkoviĆ, M. L. LaziĆ, I. B. BankoviĆ-ILIĆ   +4 more
openaire   +1 more source

Effect of solid particles on gas holdup in flotation columns—II. Investigation of mechanisms of gas holdup reduction in presence of solids

Chemical Engineering Science, 1995
Abstract Part I showed that the presence of solids decreased gas holdup under conditions typical of flotation in columns. Four mechanisms which might explain this effect are evaluated here: bubble coalescence, slurry density and viscosity changes, changes in radial gas holdup and flow profiles, and bubble wake effects.
S. Banisi, J.A. Finch, A.R. Laplante, M.E. Weber   +3 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

Size of Bubbles and Gas Holdup in Bubble Columns

Memoirs of the School of Engineering, Okayama University, 1986
Bubble columns are extensively used in the chemical industry. This paper evaluates the present state of the art on the size of bubbles from a sieve plate and gas holdup, mainly on the basis of the results of the authors, including previous ones. The size
Miyahara, Toshiro, Takahashi, Teruo
openaire   +2 more sources

Gas holdup and single bubble velocity profile

International Journal of Mineral Processing, 2011
Abstract Single bubble velocity profile (velocity vs. distance) has been measured for a 1.45 mm diameter bubble to try to explain reported differences in gas holdup in two systems: F150 vs. 1-pentanol, and MIBC vs. NaCl. It was found that in F150 the bubble slowed rapidly to reach the terminal velocity stage of the profile while in 1-pentanol the ...
Rafiei, A. A., Robbertze, M., Finch, J. A.   +2 more
openaire   +1 more source

Gas holdup in flotation columns: laboratory measurements

International Journal of Mineral Processing, 2001
The gas holdup in laboratory flotation columns was measured using a conductivity probe. Measurements in a 50-cm-diameter flotation column have shown that gas holdup varies radially depending on the sparging system array, surfactants addition, and spargers malfunctions. The column was run in two modes: unbaffled (open), and baffled (vertically).
F.J Tavera, R Escudero, J.A Finch
openaire   +1 more source

Frother persistence: A measure using gas holdup

Minerals Engineering, 2009
Persistence here refers to the how long a frother remains effective in producing small bubbles, one of its prime functions in flotation. One way to evaluate is to track gas holdup over time while air is sparged into a column: if frother is depleted bubble size will start to increase consequently increasing bubble rise velocity and hence decreasing gas ...
F. Azgomi, C.O. Gomez, J.A. Finch
openaire   +1 more source

Gas holdup in stacked expanded metal sheets

AIChE Journal, 1992
AbstractThe gas holdup in different arrays of expanded metal sheets was determined by the conductimetric method.A model had to be developed for analyzing the conductimetric behavior of the cell in the presence of the metallic sheets. The validity of this model has been verified with single phase flow.
Stella Piovano, Ursula Böhm, Juan I. Franco   +2 more
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

Improved gas holdup in novel bubble column

The Canadian Journal of Chemical Engineering, 2011
AbstractThis investigation reports the experimental and theoretical results carried out to evaluate the gas holdup for air–water system in a novel hybrid rotating and reciprocating perforated plate bubble column under countercurrent condition. The response of this hybrid column is found to be similar to that of reciprocating plate column (RPC) showing ...
S. Dhanasekaran, T. Karunanithi
openaire   +1 more source