The effects of surface active agents on jet breakup in liquid‐liquid systems

Skelland, A. H. P.; Walker, Perry George

doi:10.1002/cjce.5450670507

Cited by 16 publications

(4 citation statements)

References 30 publications

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“…However, abundant empirical evidence (cf. Skelland & Walker 1989, as well as references therein) indicates that solute mass transfer substantially affects jet stability, which motivates the present analysis.…”

Section: Introductionsupporting

confidence: 58%

Effects of solute mass transfer on the stability of capillary jets

2003

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The effects of mass transfer (e.g. via evaporation) of surface-active solutes on the hydrodynamic stability of capillary liquid jets are studied. A linear temporal stability analysis is carried out yielding evolution equations for systems satisfying general non- linear kinetic adsorption relations and accompanying surface constitutive equations. The discussion of the instability mechanism associated with the Marangoni effect clarifies that solute transfer into the jet is destabilizing whereas transfer in the opposite direction reduces instability. The general analysis is illustrated by a system satisfying Langmuir-type kinetic relations. Contrary to a clean system (i.e. in the absence of surfactants), reduced jet viscosity may lead to a substantial reduction in perturbation growth. Furthermore, the Marangoni effect gives rise to an overstability mechanism whereby perturbations whose dimensionless wavenumbers exceed unity grow with time through oscillations of increasing amplitude. The common diffusion-control approximation constitutes an upper bound which substantially overestimates the actual growth of perturbations. Considering solutes belonging to the homologous series of normal alcohols in water–air systems, the intermediate cases (e.g. hexanol–water–air which is ‘mixed-control’) are the most susceptible to Marangoni instability.

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Section: Introductionsupporting

confidence: 58%

Effects of solute mass transfer on the stability of capillary jets

2003

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“…The linear stability of a jet, uniformly covered by surfactant, has been studied for a long time [580,581] in the absence of a surrounding liquid [579,582,583] and when an external fluid is present [584][585][586]. The most remarkable general feature is that in the inviscid limit surfactants leave the linear behaviour unchanged [581,585].…”

Section: Surfactantsmentioning

confidence: 99%

Physics of liquid jets

Eggers¹,

Villermaux²

2008

Rep. Prog. Phys.

1,580

1,118

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Jets, i.e. collimated streams of matter, occur from the microscale up to the large-scale structure of the universe. Our focus will be mostly on surface tension effects, which result from the cohesive properties of liquids. Paradoxically, cohesive forces promote the breakup of jets, widely encountered in nature, technology and basic science, for example in nuclear fission, DNA sampling, medical diagnostics, sprays, agricultural irrigation and jet engine technology. Liquid jets thus serve as a paradigm for free-surface motion, hydrodynamic instability and singularity formation leading to drop breakup. In addition to their practical usefulness, jets are an ideal probe for liquid properties, such as surface tension, viscosity or non-Newtonian rheology. They also arise from the last but one topology change of liquid masses bursting into sprays. Jet dynamics are sensitive to the turbulent or thermal excitation of the fluid, as well as to the surrounding gas or fluid medium. The aim of this review is to provide a unified description of the fundamental and the technological aspects of these subjects.

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“…Mashayek (1995) Hayworth & Treybal (1950) Kitamura et al (1986 Masutani & Experimental studies Goedde & Yuen (1970) Kowalewski (1996) Kumar & Hartland (1984 Adams (2000) Arai & Amagai (1999) Lin (2003) Skelland & Walker (1989) Das (1997 Tang et al (2002, Longmire et al ( 2001) Milosevic & Longmire (2002 2003) Table 1.1 Previous studies of cylindrical liquid jet instability. Figure 1.2 from Grant and Middleman (1966) shows the typical evolution of jet breakup length observed as jet discharge velocity is increased.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Experiments were conducted by Hayworth and Treybal (1950), Meister and Scheele (1969), Kitamura et al (1982), Kumar and Hartland (1984), Skelland and Walker (1989), Kato et al (2000), Longmire et al (2001) and others to study liquid-liquid jet breakup. These studies have provided useful data on droplet size and breakup length but were limited to laminar jet flow.…”

Section: Jet Instability Regimesmentioning

confidence: 99%

Laboratory Experiments to Simulate Co2 Ocean Disposal

Masutani¹

1999

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The effects of surface active agents on jet breakup in liquid‐liquid systems

Cited by 16 publications

References 30 publications

Effects of solute mass transfer on the stability of capillary jets

Effects of solute mass transfer on the stability of capillary jets

Physics of liquid jets

Laboratory Experiments to Simulate Co2 Ocean Disposal

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