Bubble/micro-bubble regime transition in a pressurized bubble column of a low surface tension liquid system

2021 ◽  
pp. 117191
Author(s):  
Keon Bae ◽  
Jun Young Kim ◽  
Kang Seok Go ◽  
Nam Sun Nho ◽  
Dongjae Kim ◽  
...  
Keyword(s):  
Surface Tension ◽  
Bubble Column ◽  
Liquid System ◽  
Regime Transition ◽  
Micro Bubble ◽  
Bubble Regime

scholarly journals Trickle/pulse flow regime transition in downflow packed tower involving foaming liquids

2012 ◽  
Vol 18 (3) ◽  
pp. 349-359
Author(s):  
Vijay Sodhi
Keyword(s):  
Surface Tension ◽  
Liquid Flow ◽  
Liquid Surface ◽  
Regime Transition ◽  
Pulse Flow ◽  
Packed Tower ◽  
Flow Rates ◽  
Transition Boundary ◽  
Liquid Surface Tension ◽  
Pulsing Flow

The most of past studies in foaming trickle bed reactors aimed at the improvement of efficiency and operational parameters leads to high economic advantages. Conventionally most of the industries rely on frequently used gas continuous flow (GCF) where operational output is satisfactory but not yields efficiently as in pulsing flow (PF) and foaming pulsing flow (FPF). Hydrodynamic characteristics like regime transitions are significantly influenced by foaming nature of liquid as well as gas and liquid flow rates. This study?s aim was to demonstrate experimentally the effects of liquid flow rate, gas flow rates and liquid surface tension on regime transition. These parameters were analyzed for the air-aqueous Sodium Lauryl Sulphate and air-water systems. More than 240 experiments were done to obtain the transition boundary for trickle flow (GCF) to foaming pulsing flow (PF/FPF) by use excessive foaming 15-60 ppm surfactant compositions. The trickle to pulse flow transition appeared at lower gas and liquid flow rates with decrease in liquid surface tension. All experimental data had been collected and drawn in the form of four different transitional plots which are compared and drawn by using flow coordinates proposed by different researchers. A prominent decrease in dynamic liquid saturation was observed especially during regime transitional change. The reactor two phase pressure evident a sharp rise to verify the regime transition shift from GCF to PF/FPF. Present study reveals, the regime transition boundary significantly influenced by any change in hydrodynamic as well as physiochemical properties including surface tension.

Influence of Operating Pressure on Gas Holdup and Flow Regime Transition in a Bubble Column

2010 ◽  
Vol 43 (10) ◽  
pp. 829-832 ◽  
Author(s):  
Hiroaki Matsubara ◽  
Kiyoshi Naito ◽  
Hideharu Kuwamoto ◽  
Toshiyuki Sakaguchi
Keyword(s):  
Flow Regime ◽  
Bubble Column ◽  
Gas Holdup ◽  
Operating Pressure ◽  
Regime Transition ◽  
Flow Regime Transition

Évaluation du pouvoir adhérant du Lactobacillus helveticus au polystyrène expansé

1992 ◽  
Vol 38 (7) ◽  
pp. 672-675 ◽  
Author(s):  
Nathalie Dion ◽  
Jacques Goulet ◽  
Patrick Boyaval
Keyword(s):  
Surface Tension ◽  
Liquid System ◽  
Contact Angles ◽  
Expanded Polystyrene ◽  
Lactobacillus Helveticus ◽  
Bacterial Cells ◽  
Three Phase ◽  
Thermodynamic Conditions ◽  
Polystyrene Support ◽  
Solid Liquid

We measured the surface tension of a three-phase (solid–solid–liquid) system consisting of the bacterium Lactobacillus helveticus in a culture medium containing an expanded polystyrene support, to determine the adherence capacity of the bacteria to the support. The surface tension of the expanded polystyrene and the L. helveticus cells was evaluated by measuring contact angles. The Wilhelmy's microslide method was used to measure the surface tension of the liquid phase. The values obtained showed that the adherence capacity of the L. helveticus cells to expanded polystyrene pellets was not facilitated under the experimental thermodynamic conditions. The pellet surfaces and adhering bacterial cells were examined with a scanning electron microscope. The pellets exhibited several grooves in which microbial cells preferentially accumulated. Key words: Lactobacillus helveticus, adherence, surface tension, expanded polystyrene. [Translated by the journal]

Reactor Model for Fast Reactions in the Micro-Bubble Column and Validation

2007 ◽  
Vol 46 (25) ◽  
pp. 8558-8565 ◽  
Author(s):  
V. Haverkamp ◽  
V. Hessel ◽  
M. A. Liauw ◽  
H. Löwe ◽  
M. G. Menges
Keyword(s):  
Bubble Column ◽  
Reactor Model ◽  
Fast Reactions ◽  
Micro Bubble

A Review on Flow Regime Transition in Bubble Columns

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Ashfaq Shaikh ◽  
Muthanna H. Al-Dahhan
Keyword(s):  
Flow Regime ◽  
Bubble Column ◽  
Flow Behavior ◽  
Scale Up ◽  
Experimental Studies ◽  
Flow Regimes ◽  
Bubble Columns ◽  
Linear Stability Theory ◽  
Regime Transition ◽  
Flow Regime Transition

Due to varied flow behavior, the demarcation of hydrodynamic flow regimes is an important task in the design and scale-up of bubble column reactors. This article reviews most hydrodynamic studies performed for flow regime identification in bubble columns. It begins with a brief introduction to various flow regimes. The second section examines experimental methods for measurement of flow regime transition. A few experimental studies are presented in detail, followed by the effect of operating and design conditions on flow regime transition. A table summarizes the reported experimental studies, along with their operating and design conditions and significant conclusions. The next section deals with the current state of transition prediction, and includes purely empirical correlations, semi-empirical models, linear stability theory, and Computational Fluid Dynamics (CFD) based studies.

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