Results 11 to 20 of about 11,312 (266)
Bubble properties of heterogeneous bubbly flows in a square bubble column [PDF]
AIP Conference Proceedings, 2010 The present work focuses on the measurements of bubble properties in heterogeneous bubbly flows in a square bubble column. A four-point optical fibre probe was used for this purpose. The accuracy and intrusive effect of the optical probe was investigated first.
W. Bai +7 more
openaire +2 more sources
“Bubble Bunch” phenomenon in operation of a bubble column
Open Chemistry, 2009 Abstract While studying the operation of a rectangular bubble column in laboratory scale, it was observed that under certain circumstances tiny bubbles attach to larger bubbles without causing them to coalesce. In other words, bubbles with large diameters (d > 5 mm) swept tiny bubbles (d
Bastani Dariush +2 more
doaj +2 more sources
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．
Ishiyama, Hiroshi +3 more
openaire +1 more source
Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns
ChemEngineering, 2018 The paper presents a brief overview of experiments on volumetric mass transfer coefficient in bubble columns. The available experimental data published are often incomparable due to the different type of gas distributor and different operating conditions
Mária Zedníková +3 more
doaj +1 more source
Bubble Column Reactors: the Variables Influencing the Mono-dispersed Homogeneous Flow Regime
Chemical Engineering Transactions, 2023 The fluid dynamics of large-diameter bubble columns explicates in six flow regimes emergin upon an increase in the gas flow rate and can be described and predicted via correct modelling of the flow regime transition coordinates. This study focuses on the
Nicolò Varallo +2 more
doaj +1 more source
Effect of Solid Phase and Geometry on Liquid Velocity of Three-Phase Bubble Columns
Chemical Engineering Transactions, 2015 Multiphase flows have a large applicability in the industry and its studies are very important. One example of three-phase system is bubble columns operating with solid phase as catalyst in the process.
K. Klock Da Costa +4 more
doaj +1 more source
A Hydrodynamic Study in a Sieve Plate Sectionalized Bubble Column [PDF]
Engineering and Technology Journal, 2011 The sectionalization of conventional bubble columns to tray bubble column by perforated trays has been used in chemical, biochemical, and petroleum processes as an effective way to improve the gas-liquid contacting efficiency, and reduce liquid ...
Burhan Sadeq Abdulrazzaq
doaj +1 more source
Non-invasive imaging of shallow bubble columns using electrical capacitance tomography
Journal of Saudi Chemical Society, 2010 This paper deals with application of non-invasive electrical capacitance tomography to study the hydrodynamics of shallow bed bubble columns. Two bubble columns with different height to diameter ratio were used.
Waheed A. Al-Masry +3 more
doaj +1 more source
KAGAKU KOGAKU RONBUNSHU, 2001 気泡塔の流動特性に及ぼす油分分散の影響について実験的に検討した．油分の種類および濃度を変えて水道水に分散させ，気泡の流動状態および油分分散を観察し，油滴径分布・ガスホールドアップおよび液相基準物質移動容量係数を測定した．液中に安定に分散する小さな油滴が流動特性に影響する．ガスホールドアップは水道水の場合より高く，容量係数は低くなる．これらのことより，油分分散系では物質移動係数が低下すると推察される．
Bando, Yoshiyuki +5 more
openaire +1 more source
Two-Phase Bubble Columns: A Comprehensive Review
ChemEngineering, 2018 We present a comprehensive literature review on the two-phase bubble column; in this review we deeply analyze the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer phenomena.
Giorgio Besagni +2 more
doaj +1 more source