Results 221 to 230 of about 29,070 (268)
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Hydrodynamics of bubble columns in the uniform bubbling regime
Chemical Engineering Science, 1985Abstract A relation which defines the drag of spherical particles in more or less concentrated suspensions was employed to describe bubble column behaviour in the uniform bubbling regime. General validity of the relation under low density ratios of dispersed to continuous phase was shown by evaluation of fluidization experiments with spherical foamed
O. Moleurs, M. Kurtin
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Bubble characteristics in shallow bubble column reactors
Chemical Engineering Research and Design, 2010Abstract The bubble characteristics have been investigated in an air–water bubble column with shallow bed heights. The effect of bed height, location and the presence of solids on the bubble size, bubble rise velocity and overall and sectional gas holdup are studied over a range of superficial gas velocities.
Raymond Lau +2 more
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Bubble behaviour and flow structure of bubble columns
Chemical Engineering and Processing: Process Intensification, 1991Abstract Numerous experimental results concerning the flow structure in bubble columns are presented, including axial and radial components of the bubble velocity, axial components of the liquid velocity and its fluctuations as well as the radial distribution of the gas hold-up.
B.P. Yao +3 more
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On stability of a bubble column
Chemical Engineering Research and Design, 2013Abstract The goal of this contribution is to formulate the simplest possible model for the bubble column hydrodynamics and analyse it for steady states, stability, and unsteady behaviour. The governing equations are based on the mass balance of the gas phase.
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Bubble properties and pressure fluctuations in bubble columns
Korean Journal of Chemical Engineering, 1994The effects of gas (0.02-0.1 m/s) and liquid velocities (0.0-0.10 m/s) on the bubble properties and pressure fluctuations have been determined in a 0.376 m-IDx 2.1 m-high bubble column. The pressure fluctuations have been analyzed by resorting to the Fractal analysis; the time series of pressure fluctuation signals have been analyzed by means of the ...
Hyeuk Woong Kwon +3 more
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2006
The photographic and electrical conductivity methods to measure the structure of two phase flow, especially bubble size, bubble frequency, local gas hold-up and, for the latter, the bubble velocity are described.
K. Schügerl, J. Lücke, U. Oels
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The photographic and electrical conductivity methods to measure the structure of two phase flow, especially bubble size, bubble frequency, local gas hold-up and, for the latter, the bubble velocity are described.
K. Schügerl, J. Lücke, U. Oels
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Behavior of Bubbles in Bubble Columns with Vibration Exciter
Chemie Ingenieur Technik, 2013AbstractBlasensäulen, die von unten mit einem Bodenschwinger im Frequenzbereich zwischen 40 und 400 Hz angeregt werden, zeigen deutlich verbesserte Stoffübergangsgeschwindigkeiten. Dies ist durch eine Verkleinerung der Blasen durch Spaltung und die damit verbundene Oberflächenvergrößerung bedingt. Hinzu kommt eine intensive Bewegung an der Blasengrenze.
Boris Kniazev, Frerich J. Keil
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Bubble dynamics investigation in a slurry bubble column
AIChE Journal, 2008AbstractThe application of four‐point optical probe has been for the first time extended to a slurry system in a 10.2‐cm ID column. Bubble dynamics (local gas holdup, bubble chord length, bubble velocity, bubble frequency, and specific interfacial area) were investigated using an air–water‐catalyst system under atmospheric pressure. With an increase in
Chengtian Wu +2 more
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2019
This chapter introduces some fundamental bubble dynamics in liquid media. Understanding bubble dynamics is critical for bubble column design since the hydrodynamic behaviors are induced and dictated by the gas phase in the form of bubbles. Complex hydrodynamic behavior in bubble columns is closely related to the characteristics of rising bubbles and ...
D. J. Lee, L.-S. Fan
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This chapter introduces some fundamental bubble dynamics in liquid media. Understanding bubble dynamics is critical for bubble column design since the hydrodynamic behaviors are induced and dictated by the gas phase in the form of bubbles. Complex hydrodynamic behavior in bubble columns is closely related to the characteristics of rising bubbles and ...
D. J. Lee, L.-S. Fan
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