scholarly journals A Single Bubble 3D Motion in Dilute Surfactant Solution : 1st Report, Relation between Surfactant Concentration and 3D Motion(Fluids Engineering)

2010 ◽  
Vol 76 (771) ◽  
pp. 1785-1792 ◽  
Author(s):  
Yoshiyuki TAGAWA ◽  
Ami FUNAKUBO ◽  
Shu TAKAGI ◽  
Yoichiro MATSUMOTO
Keyword(s):  
Surfactant Concentration ◽  
Surfactant Solution ◽  
Single Bubble ◽  
3D Motion

scholarly journals Mathematical modelling of the overflowing cylinder experiment

2003 ◽  
Vol 474 ◽  
pp. 275-298 ◽  
Author(s):  
P. D. HOWELL ◽  
C. J. W. BREWARD
Keyword(s):  
Free Surface ◽  
Surfactant Concentration ◽  
Dynamic Properties ◽  
Vertical Cylinder ◽  
Surfactant Solution ◽  
Surface Concentration ◽  
Experimental Results ◽  
Surface Velocity ◽  
Experimental Apparatus ◽  
Finite Distance

The overflowing cylinder (OFC) is an experimental apparatus designed to generate a controlled straining flow at a free surface, whose dynamic properties may then be investigated. Surfactant solution is pumped up slowly through a vertical cylinder. On reaching the top, the liquid forms a flat free surface which expands radially before over flowing down the side of the cylinder. The velocity, surface tension and surfactant concentration on the expanding free surface are measured using a variety of non-invasive techniques.A mathematical model for the OFC has been previously derived by Breward et al. (2001) and shown to give satisfactory agreement with experimental results. However, a puzzling indeterminacy in the model renders it unable to predict one scalar parameter (e.g. the surfactant concentration at the centre of the cylinder), which must be therefore be taken from the experiments.In this paper we analyse the OFC model asymptotically and numerically. We show that solutions typically develop one of two possible singularities. In the first, the surface concentration of surfactant reaches zero a finite distance from the cylinder axis, while the surface velocity tends to infinity there. In the second, the surfactant concentration is exponentially large and a stagnation point forms just inside the rim of the cylinder. We propose a criterion for selecting the free parameter, based on the elimination of both singularities, and show that it leads to good agreement with experimental results.

Durability of a Drag Reducing Solution

2008 ◽  
Vol 18 (1) ◽  
pp. 12421-1-12421-5
Author(s):  
V. Mik ◽  
J. Myska ◽  
Z. Chara ◽  
P. Stern
Keyword(s):  
Turbulent Flow ◽  
Drag Reduction ◽  
Turbulence Intensity ◽  
Surfactant Concentration ◽  
Surfactant Solution ◽  
Small Addition ◽  
Rheological Parameters ◽  
Aging Effects ◽  
Flow Disturbance ◽  
Solution Change

AbstractEffectiveness of drag reduction by small addition of a surfactant in the turbulent flow of water depends on the structure and concentration of the additive, temperature of the solution and turbulence intensity, possible flow disturbance by a mechanical obstacle and the content of ions in water, but also on the age of the surfactant solution. We show how important aging effects are in connection with total surfactant concentration, in particular how rheological parameters of the drag reducing solution change with time.

Mass Transfer From Single Carbon Dioxide Bubbles in Contaminated Water

2014 ◽  
Author(s):  
Jiro Aoki ◽  
Kosuke Hayashi ◽  
Shogo Hosoda ◽  
Shigeo Hosokawa ◽  
Akio Tomiyama
Keyword(s):  
Carbon Dioxide ◽  
Mass Transfer ◽  
Surfactant Concentration ◽  
Bubble Diameter ◽  
Surfactant Solution ◽  
Contaminated Water ◽  
Tail Region ◽  
Transfer Rates ◽  
Small Bubbles ◽  
Taylor Bubbles

Mass transfer from single carbon dioxide bubbles rising through contaminated water in a vertical pipe of 12.5 mm diameter was measured to investigate effects of surfactant. The bubble diameter was widely varied to cover various bubble shapes such as spheroidal, wobbling, cap and Taylor bubbles. The gas and liquid phases were 99.9 % purity carbon dioxide and a surfactant solution made of purified water and Triton X-100. Comparison of mass transfer rates between contaminated and clean bubbles made clear that the surfactant decreases the mass transfer rates of small bubbles. The Sherwood number of small bubbles in the extreme cases, i.e. zero and the highest surfactant concentrations, is well correlated in terms of the bubble Reynolds number, Schmidt number and the ratio, λ, of the bubble diameter to pipe diameter. The Sherwood numbers at intermediate surfactant concentration, however, are not well correlated using available correlations. The mass transfer rates of Taylor bubbles also decrease with increasing the surfactant concentration. They however increase with the diameter ratio and approaches that of clean Taylor bubbles as λ increases. The main cause of this tendency was revealed by interface tracking simulations, i.e. the surfactant adsorbs only in the bubble tail region and the nose-to-side region is almost clean at high λ.

scholarly journals Experimental studies of the capillary desaturation curve in polymer-surfactant flooding

2021 ◽  
Vol 6 (1) ◽  
pp. 40-46
Author(s):  
A. G. Skripkin ◽  
I. N. Koltsov ◽  
S. V. Milchakov
Keyword(s):  
Surfactant Concentration ◽  
Experimental Studies ◽  
Surfactant Solution ◽  
Residual Oil ◽  
Laboratory Studies ◽  
Surfactant Flooding ◽  
Phase Permeability ◽  
Oil Saturation ◽  
Residual Oil Saturation ◽  
Polymer Surfactant

The paper presents the results of laboratory studies of polymer-surfactant flooding on core samples of different permeability. The obtained data are used in hydrodynamic modeling. Experimental studies included: • study of the dynamics of oil displacement, plotting the dependence of the residual oil saturation on the surfactant concentration – interfacial tension at the interface of the surfactant-oil solution; • comparative experimental studies of residual oil saturation when oil is displaced by surfactant compositions of various manufacturers; • comparative studies of phase permeability in flood experiments for the filtration of oil and water, oil and polymer-surfactant solution at different ratios in the flow.

scholarly journals Synthesis and Performance Evaluation of a Betaine Surfactant

2020 ◽  
Vol 213 ◽  
pp. 03012
Author(s):  
Rongjun Zhang ◽  
Zhengpeng Zhou ◽  
Xuegang Wei ◽  
Wei Wei ◽  
Xiaoke Wang ◽  
...  
Keyword(s):  
Surface Tension ◽  
Interfacial Tension ◽  
Ring Opening ◽  
Surfactant Concentration ◽  
Raw Materials ◽  
Surfactant Solution ◽  
Salt Resistance ◽  
Water Separation ◽  
Ring Opening Reaction ◽  
And Performance

Using sodium bisulfite and epichlorohydrin as raw materials, the ring-opening reaction is carried out under the action of acatalyst to produce sodium 3-chloro-2-hydroxypropane sulfonate, followed by dodecyl tertiary amine, isopropanol, sodium hydroxide and 3-chloro-2-hydroxypropane sulfonate sodium as raw materials, under certain conditions to synthesize dodecyl hydroxy sulfobetaine surfactant. The surface tension, interfacial tension, salt resistance and emulsification properties of the synthesized surfactants were tested and evaluated. The experimental results show that the surfactant has a low critical micelle concentration and surface tension; the interfacial tension decreases with the increase of surfactant concentration. When the concentration is greater than or equal to 0.3%, the interfacial tension reaches 10-2 level; the dodecyl hydroxy sulfobetaine surfactant solution shows good salt resistance; when the concentration of dodecyl hydroxy sulfobetaine surfactant solution is 0.5%, the water separation rate in 120 minutes is the lowest and the emulsification ability is the strongest.

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