The break-up of a liquid cylinder in a centrifugal field

Lekkerkerker, H.N.W.; Hoog, E.H.A. de

doi:10.1016/s0378-4371(01)00222-9

Cited by 6 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The viscosity of the liquid phase is of the order of 100 mPas and of the gas phase 10 mPas, see the Appendix of this chapter. In addition, they measured the interfacial tension using the spinning drop technique and by following the breakup of a gas cylinder surrounded by liquid [36,37,66]. They measured an interfacial tension of a few µN/m, as will be discussed in more detail in chapter 5.…”

Section: System 1: Sio 2 + Pdms In Cyclohexane (Spc13)mentioning

confidence: 99%

“…The breakup rate of a viscous cylinder surrounded by another viscous fluid depends on both the viscosities, the initial distortions and the radius of the cylinder [225]. Taking only the inner viscosity into account can give a reasonable estimate of the breakup rate [37,66] and leads to γ/η L for liquid and γ/η G for gas cylinders. In case of a cylinder the prefactor of (9.6) can become of the order of 0.01 or smaller [66], but the prefactor might be much larger given the already heavily curved (i.e.…”

Section: Initial Phase Separationmentioning

confidence: 99%

“…Taking only the inner viscosity into account can give a reasonable estimate of the breakup rate [37,66] and leads to γ/η L for liquid and γ/η G for gas cylinders. In case of a cylinder the prefactor of (9.6) can become of the order of 0.01 or smaller [66], but the prefactor might be much larger given the already heavily curved (i.e. distorted) interconnected structure in the spinodal case.…”

Section: Initial Phase Separationmentioning

confidence: 99%

See 2 more Smart Citations

The interface in demixed colloid–polymer systems: wetting, waves and droplets

Aarts

2007

Soft Matter

View full text Add to dashboard Cite

By comparison, the interfacial tension between the coexisting phases has received little attention. Here, we show that the ultralow interfacial tension in fluid-fluid demixed colloid-polymer systems, which is roughly one million times smaller than in ordinary liquids, manifests itself in a wide variety of interface characteristics and processes. Discussed are the interfacial wetting behaviour close to a hard wall, the thermal capillary waves at the free interface and the process of droplet coalescence and breakup. These subjects can be studied in a single experiment by combining modern soft matter chemistry and laser scanning confocal microscopy. This combination allows a further exploration of a broad range of interface issues.

show abstract

Section: System 1: Sio 2 + Pdms In Cyclohexane (Spc13)mentioning

confidence: 99%

Section: Initial Phase Separationmentioning

confidence: 99%

Section: Initial Phase Separationmentioning

confidence: 99%

See 1 more Smart Citation

The interface in demixed colloid–polymer systems: wetting, waves and droplets

Aarts

2007

Soft Matter

View full text Add to dashboard Cite

show abstract

“…The breakup rate of a viscous cylinder surrounded by another viscous fluid depends on both the viscosities, the initial distortions and the radius of the cylinder [36]. Taking only the inner viscosity into account gives a reasonable estimate of the breakup rate [37] and leads to γ/η L for liquid and γ/η G for gas cylinders. For cylinders, the prefactor of (6) can become of the order of 0.01 or smaller [37], but the prefactor might be much larger given the already heavily curved (i.e.…”

Section: Initial Phase Separationmentioning

confidence: 99%

“…Taking only the inner viscosity into account gives a reasonable estimate of the breakup rate [37] and leads to γ/η L for liquid and γ/η G for gas cylinders. For cylinders, the prefactor of (6) can become of the order of 0.01 or smaller [37], but the prefactor might be much larger given the already heavily curved (i.e. distorted) interconnected structure in the spinodal case.…”

Section: Initial Phase Separationmentioning

confidence: 99%

Interfacial dynamics in demixing systems with ultralow interfacial tension

Aarts¹,

Dullens

Lekkerkerker

2005

New J. Phys.

View full text Add to dashboard Cite

Abstract. We report measurements on fluid-fluid phase separation in a colloidpolymer mixture, which can be followed in great detail due to the ultralow interfacial tension. The use of the real-space technique, laser-scanning confocal microscopy, leads to clear, well-defined images making quantitative comparisons to theory possible and being highly instructive. Simple scaling arguments are given why, in experiment, three steps of the phase separation can be observed: an interfacial-tension-driven coarsening, gravity-driven flow and finally the interface formation. All these processes are observed in a single experiment. The first stage can be quantitatively described by viscous hydrodynamics. Coarsening occurs through pinch-off events. The second stage begins at a typical size of ∼2π times the capillary length reminiscent of the Rayleigh-Taylor instability. The liquid phase breaks up and becomes discontinuous. There is strong directional flow in the system, but the Reynold's number remains much smaller than unity. Finally, the macroscopic interface is formed, growing upwards, with a velocity comparable to the coarsening velocity in the initial stage. Again, viscous hydrodynamics apply with a characteristic velocity of the interfacial tension over the viscosity.

show abstract

Effect of Permeability on Aqueous Biopolymer Interfaces in Spinning Drop Experiments

2006

View full text Add to dashboard Cite

In this paper we show that interfaces in aqueous phase-separated biopolymer mixtures are permeable for all components present in the system. In spinning drop experiments, droplets of the low-density phase decreased up to 90% in volume over a time span of days to weeks, when inserted in a matrix of the high-density phase. We propose an expression for this change of volume in time in terms of diffusion coefficients of the components. From the magnitude of these coefficients, we conclude that the transfer of gelatin from inside the droplet to the outer phase was the rate-determining step in this process. Since the interfaces are permeable to all components, the properties of the system change in time. Therefore, the spinning drop technique is not an accurate method for the measurement of the equilibrium interfacial tension of these aqueous phase-separated systems.

show abstract

The break-up of a liquid cylinder in a centrifugal field

Abstract: A simple model for the e ect of a centrifugal ÿeld on the break-up of a long liquid cylinder is developed. The results are in qualitative agreement with recent observations.

Cited by 6 publications

References 6 publications

The interface in demixed colloid–polymer systems: wetting, waves and droplets

The interface in demixed colloid–polymer systems: wetting, waves and droplets

Interfacial dynamics in demixing systems with ultralow interfacial tension

Effect of Permeability on Aqueous Biopolymer Interfaces in Spinning Drop Experiments

Contact Info

Product

Resources

About