Results 241 to 250 of about 153,374 (300)
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ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
Nigar Kantarci +2 more
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AbstractFor Abstract see ChemInform Abstract in Full Text.
Nigar Kantarci +2 more
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Bubble size distribution in bubble columns
The Canadian Journal of Chemical Engineering, 1990AbstractThe 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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KAGAKU KOGAKU RONBUNSHU, 2001
気泡塔のガスホールドアップに対する圧力の影響をガス分散器として用いた単一ノズルの内径およびガスの種類をN2とCO2に変化させて実験的に検討した．単一ノズルの内径が4.0mmの場合にはガスホールドアップに対する圧力の影響はガスの種類によらずほとんど認められなかった．単一ノズルの内径が1.4mmでN2を用いた場合には，ガスホールドアップは圧力とともに増加した．単一ノズルの内径が1.4mmでCO2を用いた場合には，ガスホールドアップは0.6MPa付近まで圧力と共に増加した，さらに圧力が上昇するとガスホールドアップは減少した．塔壁面での気泡の写真撮影および塔中心部での気泡頻度の測定を行い，前述の現象の原因について実験的に検討した．
Hiroshi Ishiyama +3 more
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気泡塔のガスホールドアップに対する圧力の影響をガス分散器として用いた単一ノズルの内径およびガスの種類をN2とCO2に変化させて実験的に検討した．単一ノズルの内径が4.0mmの場合にはガスホールドアップに対する圧力の影響はガスの種類によらずほとんど認められなかった．単一ノズルの内径が1.4mmでN2を用いた場合には，ガスホールドアップは圧力とともに増加した．単一ノズルの内径が1.4mmでCO2を用いた場合には，ガスホールドアップは0.6MPa付近まで圧力と共に増加した，さらに圧力が上昇するとガスホールドアップは減少した．塔壁面での気泡の写真撮影および塔中心部での気泡頻度の測定を行い，前述の現象の原因について実験的に検討した．
Hiroshi Ishiyama +3 more
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Understanding bubble hydrodynamics in bubble columns
Experimental Thermal and Fluid Science, 2013Abstract Compared to conventional gas–liquid bubble columns, gas–liquid columns including both gas and liquid flows have been investigated less due to their complex hydrodynamics and operational difficulties. In this study, simultaneous non-intrusive methods of column shell vibration and pressure fluctuation measurements were coupled with direct ...
Amir Sheikhi +4 more
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Bubble swarm characteristics in bubble columns
The Canadian Journal of Chemical Engineering, 1976AbstractNew correlations have been proposed for estimation of gas phase holdup, characteristic velocity, interfacial area for mass transfer and mean bubble size of bubble swarms under dispersed and fluidized operation of bubble columns employing single — and multi‐orifice distributors.
Akhilesh Kumar +3 more
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Coalescence efficiency of bubbles in bubble columns
The Canadian Journal of Chemical Engineering, 2011AbstractBubble size distribution was modelled by employing the population balance equation (PBE). All three bubble coalescence mechanisms (turbulence, buoyancy and laminar shear) and the main bubble breakup mechanism (breakup due to turbulent eddies) were considered in the model.
Navid Bizmark +4 more
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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 Formation and Coalescence in Bubble Columns
Chemie Ingenieur Technik, 1989Etude du mecanisme de formation et de coalescence des bulles au niveau d'orifices simples et triples immerges dans de l'eau dans une colonne bidimensionnelle.
Mohammad Jamialahmadi +1 more
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AIChE Journal, 1997
AbstractLiquid circulation in bubble columns influences many system properties such as mass transfer and catalyst dispersion. Conditions favorable for liquid circulation often exist only for highly turbulent slurries. Experiments under conditions of lowered surface tension proved conclusively that uniform circulation can exist even in the bubbly‐flow ...
L. F. Burns, R. G. Rice
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AbstractLiquid circulation in bubble columns influences many system properties such as mass transfer and catalyst dispersion. Conditions favorable for liquid circulation often exist only for highly turbulent slurries. Experiments under conditions of lowered surface tension proved conclusively that uniform circulation can exist even in the bubbly‐flow ...
L. F. Burns, R. G. Rice
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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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