Instability of stationary and uniformly moving cylindrical fluid bodies—I. Newtonian systems

Lee, Wei-Kuo; Flumerfelt, Raymond W.

doi:10.1016/0301-9322(81)90045-8

Cited by 30 publications

(9 citation statements)

References 13 publications

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“…Rayleigh instability theory states that cylindrical threads of viscous fluid will develop instabilities or varicose morphology within a certain time scale. 22 This theory has been applied to polymer solutions in rheology, 23 threads of human saliva, 24 and electrospun jets, 25 but has not been applied to RJS formed fibers. In RJS, bead formation occurs because the surface tension is minimized in a spherical geometry subsequently resulting in a minimized surface area.…”

Section: Resultsmentioning

confidence: 99%

Effect of Solvent Evaporation on Fiber Morphology in Rotary Jet Spinning

et al. 2014

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The bulk production of polymeric nanofibers is important for fabricating high performance, nano-scale materials. Rotary Jet-Spinning (RJS) enables the mass production of nanostructured fibers by centrifugal forces but may result in inconsistent surface morphologies. Because nanofiber performance is dependent on its surface features, we asked which parameters must be optimized during production to control fiber morphology. We developed and tested a mathematical model that describes how the competition between fluid instability and solvent removal in RJS regulates the degree of beading in fibers. Our data suggests that solvent evaporation during the spinning process causes an increase in jet viscosity and that these changes inhibit both bead formation and jet thinning. The RJS was used to vary experimental parameters showing that fiber beading can be reduced by increasing solvent volatility, solution viscosity, and spinning velocity. Collectively, our results demonstrate that nanofiber morphology and diameter can be precisely controlled during RJS manufacturing.

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Section: Resultsmentioning

confidence: 99%

Effect of Solvent Evaporation on Fiber Morphology in Rotary Jet Spinning

et al. 2014

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“…Linear stability results presented in Lee & Flumerfelt [6] for moderate Re capillary wave growth suggests that for the example shown in Figure 3d, a wavelength of around 1.11 has the largest possible growth rate. Clearly this length is larger than the wavelengths observed along the filament in the simulations, suggesting that the instabilities observed in the figure are not C164 surface tension related.…”

Section: C155mentioning

confidence: 99%

A parametric study of droplet deformation through a microfluidic contraction

Harvie¹,

Davidson²,

Cooper‐White³

et al. 2005

ANZIAMJ

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A numerical parametric study of droplet deformation within an axisymmetric micro-fluidic contraction is performed. The simulations use a transient Volume of Fluid finite volume algorithm and cover parameter ranges representative of micro-sized liquid-liquid systems. We consider two disperse continuous viscosity ratios. When the phases have equal viscosities, the predicted droplet shapes range from short 'slugs' constrained by the contraction walls through to long thin 'filaments'. When the disperse phase viscosity is lower than that of the continuous phase, capillary waves and other instabilities develop along *

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“…Tomotika (1935) also discussed the limiting cases of k = 0 and 1, and showed that the fastest growing mode is indeed the k = 0 mode for these limits as predicted by Rayleigh (1882). Tomotika's (1935) analysis was further developed by many researchers (Lee & Flumerfelt, 1981;Meister & Scheele, 1967;Stone & Brenner, 1996). These studies clearly indicated that viscosity ratio alters the stability of jets significantly.…”

Section: Introductionmentioning

confidence: 90%