Results 261 to 270 of about 104,071 (312)

A mesoscale approach for population balance modeling of bubble size distribution in bubble column reactors

Chemical Engineering Science, 2017
Prediction of bubble size distribution is of paramount importance for the study of bubble column reactors. Current kernel functions for coalescence or breakage in CFD-PBM simulation are usually derived from the isotropic turbulence theory and ...
Ning Yang
exaly   +2 more sources

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Bubble-size distributions in foams

Advances in Colloid and Interface Science, 1992
Abstract Bubble-size distributions in foams can be used to study foam properties and to distinguish between the physical processes that contribute to the breakdown of the foam. These processes are drainage, coalescence and disproportionation. A new Foam Analyzer was developed to measure various foam characteristics like the rate of drainage, the rate
Bisperink, C.G.J., Ronteltap, A.D., Prins, A.   +2 more
openaire   +2 more sources

Bubble size estimation in a bubble swarm

Journal of Colloid and Interface Science, 1988
Abstract The hindered settling equations of J. H. Masliyah (Chem. Eng. Sci.34, 1166 (1979)) have been adapted to predict mean bubble size in bubble swarms. The measurements required are superficial liquid and gas rates, and gas holdup. Predicted and measured (by photography) bubble sizes agree within 15% over the tested range 0.5–1.5 mm.
J.B Yianatos, J.A Finch, G.S Dobby, Manqiu Xu   +3 more
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Bubble size distribution in bubble columns

The Canadian Journal of Chemical Engineering, 1990
AbstractThe bubble size distributions are measured for the air‐water system as a function of air velocity at room temperature in two bubble columns. High speed cinephotography and fiber optic probe techniques are used to measure the bubble size. Our limited measurements suggest that the bubble size may be independent of gas velocity in the range 3.6 to
A. C. Saxena, N. S. Rao, S. C. Saxena
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Bubble sizing with a high spatial resolution

IEEE 1988 Ultrasonics Symposium Proceedings., 1990
The authors propose a technique that allows them to size bubbles with the same accuracy as with the double-frequency method and to locate them with the same range resolution as with the pulsed Doppler velocimeter. They demonstrate that the signal scattered by the bubble insonified by a high-frequency pulsed ultrasonic field and a low-frequency pumping ...
D, Cathignol, J Y, Chapelon, V L, Newhouse, P M, Shankar   +3 more
openaire   +2 more sources

Prediction of the bubble-hole size of a cap bubble in a bubble swarm

Chemical Engineering Science, 1997
Abstract A phenomenological, semi-theoretical model is proposed for predicting the size or thickness of the bubble-depleted region, or ‘bubble hole’, in the frontal vicinity of a larg cap bubble rising through a swarm of otherwise uniformly dispersed small bubbles.
Katsumi Tsuchiya, Kazutomo Ohsaki
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Factor Affecting Bubble Creation and Bubble Size

Volume 1: Advances in Aerospace Technology; Energy Water Nexus; Globalization of Engineering; Posters, 2011
This paper presents the factors affecting air bubble size when air is injected through a perforated membrane into a water pool. Critical factors that govern the size of air bubbles are the air pressure and the flow rate as well as the hole size of the diffuser membrane. In order to have a better understanding of how bubble size can be affected and what
Ammar A. T. Alkhalidi, Ryo S. Amano
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Optical monitoring of bubble size and shape in a pulsating bubble surfactometer

Journal of Applied Physiology, 2005
The pulsating bubble surfactometer (PBS) is often used for in vitro characterization of exogenous lung surfactant replacements and lung surfactant components. However, the commercially available PBS is not able to dynamically track bubble size and shape.
Shannon L, Seurynck, Nathan J, Brown, Cindy W, Wu, Kevin W, Germino, Ellen K, Kohlmeir, Edward P, Ingenito, Matthew R, Glucksberg, Annelise E, Barron, Mark, Johnson   +8 more
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Acoustics of bubbly sediments with a distribution of bubble sizes.

The Journal of the Acoustical Society of America, 1991
A model for a saturated, porous elastic medium containing bubbles of gas [J. Acoust. Soc. Am. 73, 409–417 (1983)] has been combined with a model for a bubbly liquid with a bubble population whose radii vary continuously over a known distribution [J. Acoust. Soc. Am. Suppl. 1 88, (1990)] to obtain an acoustical model for saturated sediments containing a
J. A. Hawkins, A. Bedford
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