scholarly journals Break-up of suspension drops settling under gravity in a viscous fluid close to a vertical wall

2011 ◽  
Vol 23 (6) ◽  
pp. 063302 ◽  
Author(s):  
Anna Myłyk ◽  
Walter Meile ◽  
Günter Brenn ◽  
Maria L. Ekiel-Jeżewska
Keyword(s):  
Viscous Fluid ◽  
Vertical Wall ◽  
Break Up ◽  
Suspension Drops

Rods falling near a vertical wall

1977 ◽  
Vol 83 (2) ◽  
pp. 273-287 ◽  
Author(s):  
W. B. Russel ◽  
E. J. Hinch ◽  
L. G. Leal ◽  
G. Tieffenbruck
Keyword(s):  
Integral Equation ◽  
Viscous Fluid ◽  
Numerical Solution ◽  
Vertical Wall ◽  
Numerical Results ◽  
Slender Body ◽  
Asymptotic Results ◽  
Slender Body Theory ◽  
Friction Coefficients ◽  
Body Theory

As an inclined rod sediments in an unbounded viscous fluid it will drift horizontally but will not rotate. When it approaches a vertical wall, the rod rotates and so turns away from the wall. Illustrative experiments and a slender-body theory of this phenomenon are presented. In an incidental study the friction coefficients for an isolated rod are found by numerical solution of the slender-body integral equation. These friction coefficients are compared with the asymptotic results of Batchelor (1970) and the numerical results of Youngren ' Acrivos (1975), who did not make a slender-body approximation.

A cloud of rigid fibres sedimenting in a viscous fluid

2010 ◽  
Vol 648 ◽  
pp. 351-362 ◽  
Author(s):  
JOONTAEK PARK ◽  
BLOEN METZGER ◽  
ÉLISABETH GUAZZELLI ◽  
JASON E. BUTLER
Keyword(s):  
Viscous Fluid ◽  
The Self ◽  
Hydrodynamic Interactions ◽  
Spherical Particles ◽  
Far Field ◽  
Anisotropic Particles ◽  
Secondary Droplets ◽  
Break Up ◽  
Self Motion ◽  
Different Levels

Experiments and numerical simulations have been performed to investigate the deformation and break-up of a cloud of rigid fibres falling under gravity through a viscous fluid in the absence of inertia and interfacial tension. The cloud of fibres is observed to evolve into a torus that subsequently becomes unstable and breaks up into secondary droplets which themselves deform into tori in a repeating cascade. This behaviour is similar to that of clouds of spherical particles, though the evolution of the cloud of fibres occurs more rapidly. The simulations, which use two different levels of approximation of the far-field hydrodynamic interactions, capture the evolution of the cloud and demonstrate that the coupling between the self-motion and hydrodynamically induced fluctuations are responsible for the faster break-up time of the cloud. The dynamics of the cloud are controlled by a single parameter which is related to the self-motion of the anisotropic particles. The experiments confirm these findings.

scholarly journals Breaking up of a drop of viscous liquid immersed in another viscous fluid which is extending at a uniform rate

1936 ◽  
Vol 153 (879) ◽  
pp. 302-318 ◽  
Keyword(s):  
Viscous Fluid ◽  
Viscous Liquid ◽  
Experimental Studies ◽  
Lubricating Oil ◽  
Disruptive Effect ◽  
Viscous Forces ◽  
Two Fluids ◽  
Initial Drop ◽  
Break Up ◽  
Surrounding Liquid

1—In a previous papers the present writer has discussed the instability of a long cylindrical column of an incompressible viscous liquid surrounded by another viscous fluid under the action of both surface tension and viscous forces. In this work the fluids were at rest except for the small disturbances which were assumed to develop slowly. It was shown that if the ratio of viscosities of the two fluids is neither zero nor infinity the maximum instability always occurs at a certain definite value of the wavelength of the assumed initial varicosity so that the formation of drops of definite size would be expected. A comparison of the theory with observation has also been made and satisfactorily good agreement between them was found. Now, in his experimental studies on the mode of formation of a cylindrical thread from a drop of a viscous liquid by the disruptive effect of the viscous drags of a surrounding liquid, professor G. I. Taylor observed that when a drop of black lubricating oil was surrounded by syrup, the thread formed by pulling out the drop did not at once break up into small drops but remained cylindrical for some time and finally broke up into small drops, the diameters of which were about 1/10th of the diameter of the original drop. On the other band, if as soon as the cylindrical thread was formed the apparatus was stopped the thread immediately began to break up in the manner described above. Thus, if the apparatus were kept going very much smaller drops were formed than if it were stopped as soon as the initial drop bad been pulled out into a cylindrical thread.

The calamity of family break-up

Nature ◽  
1998 ◽  
Author(s):  
Henry Gee
Keyword(s):  
Break Up
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