Controlled foam generation using cyclic diphasic flows through a constriction

Gaillard, Thibaut; Roché, Matthieu; Honorez, Clément; Jumeau, Maxime; Balan, Antoine; Jedrzejczyk, C.; Drenckhan, Wiebke

doi:10.1016/j.ijmultiphaseflow.2017.02.009

Cited by 81 publications

(54 citation statements)

References 28 publications

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“…Foam generation. Liquid foams were generated by using the "double-syringe technique" [10], which consists in filling a syringe with the desired amount of foaming solution and gas, then connecting to another syringe and pushing back and forth the pistons to obtain an homogeneous foam. With this technique, providing that the solution has a good "foamability", a large range of liquid volume fractions (Φ) can be obtained, just by adjusting the proportion of liquid and gas in the syringe.…”

Section: Sample Preparationmentioning

confidence: 99%

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Investigating the origin of acoustic attenuation in liquid foams

et al. 2017

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Liquid foams are known to be highly efficient to absorb acoustic waves but the origin of the sound dissipation remains unknown. In this paper, we present low frequency (0.5-4kHz) experimental results measured with an impedance tube and we confront the recorded attenuations with a simple model that considers the foam as a concentrate bubbly liquid. In order to identify the influence of the different parameters constituting the foams we probe samples with different gases, and various liquid fractions and bubble size distributions. We demonstrate that the intrinsic acoustic attenuation in the liquid foam is due to both thermal and viscous losses. The physical mechanism of the viscous term is not elucidated but the microscopic effective viscosity evidenced here can be described by a phenomenological law scaling with the bubble size and the gas density. In our experimental configuration a third dissipation term occurs. It comes from the viscous friction on the wall of the impedance tube and it is well described by the Kirchhoff law considering the macroscopic effective viscosity classically measured in rheology experiments.

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Section: Sample Preparationmentioning

confidence: 99%

“…2). In (a) the continuous line indicates the η foam viscosity expected at 1 kHz, as given by phenomenological law (10), with no fitting parameter.…”

Section: Fittingmentioning

confidence: 99%

Investigating the origin of acoustic attenuation in liquid foams

et al. 2017

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“…Emulsions were produced according to a Double Syringe (DS) method. This method, developed and mainly used for foams [11,35], is here adapted for investigating emulsions. In this technique, emulsions are obtained by repetitive exchanging of the liquids between two syringes connected by a short narrow pipe.…”

Section: Methodsmentioning

confidence: 99%

Interfacial Properties and Emulsification of Biocompatible Liquid-Liquid Systems

et al. 2020

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A comparative study is reported on the interfacial properties of a set of surfactants and is discussed in terms of the effects on the features of the corresponding oil-water emulsions. The surfactants are saponin, Tween 80 and citronellol glucoside (CG), while the oil is Miglyol 812N—A Medium Chain Triglyceride (MCT) oil. Due to their high biocompatibility, all these compounds are variously utilized in food, cosmetic or pharmaceutical products. Among the surfactants, which are all soluble in water, CG presents also an important solubility in oil, as shown by the measured partition coefficient. For these systems, dynamic and equilibrium interfacial tensions and dilational viscoelasticity are measured as a function of the surfactant concentration and analyzed according to available adsorption models. In order to compare these results with the time evolution of the corresponding emulsions, the actual surfactant concentration in the matrix phase of the emulsion is accounted for. This may differ significantly from the nominal concentration of the solutions before dispersing them, because of the huge area of droplets available for surfactant adsorption in the emulsion. Using this approach allows the derivation of the correlations between the observed emulsion behavior and the actual surfactant coverage of the droplet interface.

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“…The two-syringe technique was used to obtain liquid foams [34,35]. The liquid fraction ɸ, defined as the ratio V liquid /V foam of the liquid volume to the total foam volume, was fixed at 0.16. ɸ is controlled by the ratio of the initial amount of the liquid and the total volume of the two syringes.…”

Section: Foam Formation and Rheometrymentioning

confidence: 99%

Interfacial properties, film dynamics and bulk rheology: A multi-scale approach to dairy protein foams

Audebert

Saint‐Jalmes

Beaufils

et al. 2019

Journal of Colloid and Interface Science

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Hypothesis The effective contribution of interfacial properties to the rheology of foams is a source of many open questions. Film dynamics during topological T1 changes in foams, essentially studied for low molecular weight surfactants, and scarcely for proteins, could connect interfacial properties to protein foam rheology. Experiments We modified whey protein isolate (WPI), and its purified major protein β-lactoglobulin (β-lg) by powder pre-conditioning and dry-heating in order to obtain a broad variety of interfacial properties. We measured interfacial properties, film relaxation duration after a T1 event and bulk foam rheology. Findings We found that, for β-lg, considered as a model protein, the higher the interfacial elastic modulus, the longer the duration of topological T1 changes and the greater the foam storage and loss moduli and the yield stress. However, in the case of the more complex WPI, these correlations were less clear. We propose that the presence in WPI of other proteins, lactose and minerals modify the impact of preconditioning and dry-heating on proteins and thereby, their behaviour at the interface and inside the liquid film.

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Controlled foam generation using cyclic diphasic flows through a constriction

Cited by 81 publications

References 28 publications

Investigating the origin of acoustic attenuation in liquid foams

Investigating the origin of acoustic attenuation in liquid foams

Interfacial Properties and Emulsification of Biocompatible Liquid-Liquid Systems

Interfacial properties, film dynamics and bulk rheology: A multi-scale approach to dairy protein foams

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