Beads-on-string phenomena in wormlike micellar fluids

Sostarecz, Michael; Belmonte, Andrew

doi:10.1063/1.1779672

Cited by 26 publications

(24 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additional details of many of these applications are provided in the monograph by Yarin [11]. Similar beads-on-a-string structures have also been documented recently during gravitationally driven stretching of fluid threads formed from wormlike micellar solutions [12].…”

Section: Introductionmentioning

confidence: 79%

“…Using image analysis software (ImageJ; NIH), we are able to measure the diameters of the connecting filament at the onset of each bead formation event (denoted henceforth D N for N =1, 2, ...), as well as the bead diameters (denoted B n ) for each generation of beads well into the beads-on-a-string regime. The evolution in the bead radius and thread diameter within one period are connected through conservation of mass [12]. The bead diameters for the first three generations are B 1 ≈ 110 m, B 2 ≈ 75 m and B 3 ≈ 31 m, respectively.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Iterated stretching, extensional rheology and formation of beads-on-a-string structures in polymer solutions

Oliveira¹,

Yeh

McKinley

2006

Journal of Non-Newtonian Fluid Mechanics

144

View full text Add to dashboard Cite

The transient extensional rheology and the dynamics of elastocapillary thinning in aqueous solutions of polyethylene oxide (PEO) are studied with high-speed digital video microscopy. At long times, the evolution of the thread radius deviates from self-similar exponential decay and competition between elastic, capillary and inertial forces leads to the formation of a periodic array of beads connected by axially uniform ligaments. This configuration is unstable and successive instabilities propagate from the necks connecting the beads and ligaments. This iterated process results in multiple generations of beads developing along the string in general agreement with predictions of Chang et al. [Phys. Fluids, 11 (1999) 1717] although the experiments yield a different recursion relation between the successive generations of beads. At long times, finite extensibility truncates the iterated instability, and slow axial translation of the bead arrays along the interconnecting threads leads to progressive coalescence before the ultimate rupture of the fluid column. Despite these dynamical complexities it is still possible to measure the steady growth in the transient extensional viscosity by monitoring the slow capillary-driven thinning in the cylindrical ligaments between beads.

show abstract

Section: Introductionmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Iterated stretching, extensional rheology and formation of beads-on-a-string structures in polymer solutions

Oliveira¹,

Yeh

McKinley

2006

Journal of Non-Newtonian Fluid Mechanics

144

View full text Add to dashboard Cite

show abstract

“…Similar beads-on-a-string structures have also recently been documented in wormlike micellar solutions. 8 The formation of a beads-on-a-string morphology is inherently a nonlinear dynamical process. Classical linear stability analysis shows that a viscoelastic fluid thread is in fact more unstable than a Newtonian fluid; however, uniaxial extensional flow in the filament results of exponential growth of the polymeric stresses and simulations show the formation of an axially uniform thread connecting two droplets.…”

mentioning

confidence: 99%

Iterated stretching and multiple beads-on-a-string phenomena in dilute solutions of highly extensible flexible polymers

2005

View full text Add to dashboard Cite

A new instrument for dynamic helical squeeze flow which superposes oscillatory shear and oscillatory squeeze flow Rev. Sci. Instrum. 83, 085105 (2012) The effects of hydrodynamic interaction and inertia in determining the high-frequency dynamic modulus of a viscoelastic fluid with two-point passive microrheology Phys. Fluids 24, 073103 (2012) MHD free convection flow of a visco-elastic (Kuvshiniski type) dusty gas through a semi infinite plate moving with velocity decreasing exponentially with time and radiative heat transfer AIP Advances 1, 022132 (2011) Transitional flow of a non-Newtonian fluid in a pipe: Experimental evidence of weak turbulence induced by shearthinning behavior Phys. Fluids 22, 101701 (2010) Effects of viscoelasticity on the probability density functions in turbulent channel flow

show abstract

“…21 In BOAS flow, queues of droplets are connected by a series of liquid threads, which makes them look like a fluid necklace with regular periods. [21][22][23][24][25] The BOAS pattern is easily found in nature, such as silk beads and cellular protoplasm, and is often encountered in industrial processes as well, such as in electrospinning and anti-misting. 21,22 In general, it is thought that BOAS structure occurs mostly in viscoelastic fluids 22 and is an unstable structure, which evolves continually and breaks eventually.…”

Section: -17mentioning

confidence: 99%

“…21,22 In general, it is thought that BOAS structure occurs mostly in viscoelastic fluids 22 and is an unstable structure, which evolves continually and breaks eventually. [21][22][23][24][25][26][27][28][29] Flow patterns determine the inter-relations of fluids in a microdevice and are an important parameter to control. Common methods for adjusting microfluidic flow patterns include varying the fluid flow rates, fluid properties, and channel geometries.…”

Section: -17mentioning

confidence: 99%

Modulating patterns of two-phase flow with electric fields

et al. 2014

View full text Add to dashboard Cite

This paper describes the use of electro-hydrodynamic actuation to control the transition between three major flow patterns of an aqueous-oil Newtonian flow in a microchannel: droplets, beads-on-a-string (BOAS), and multi-stream laminar flow. We observed interesting transitional flow patterns between droplets and BOAS as the electric field was modulated. The ability to control flow patterns of a two-phase fluid in a microchannel adds to the microfluidic tool box and improves our understanding of this interesting fluid behavior. 1,2 In recent years, there has been increasing interest in two-phase flow and droplet microfluidics, owing to their potential for providing a high-throughput platform for carrying out chemical and biological analysis and manipulations.3-8 Although droplets may be generated in many different ways, such as with electric fields or extrusion through a small nozzle, 9-12 the most common microfluidic methods are based on the use of either T-junctions or flow-focusing geometries with which uniform droplets can be formed at high frequency in a steady-state fashion. 13,14 Various operations, such as cell encapsulation, droplet fusion, splitting, mixing, and sorting, have also been developed, and these systems have been demonstrated for a wide range of applications, including cell analysis, protein crystallization, and material synthesis.

show abstract

Beads-on-string phenomena in wormlike micellar fluids

Cited by 26 publications

References 19 publications

Iterated stretching, extensional rheology and formation of beads-on-a-string structures in polymer solutions

Iterated stretching, extensional rheology and formation of beads-on-a-string structures in polymer solutions

Iterated stretching and multiple beads-on-a-string phenomena in dilute solutions of highly extensible flexible polymers

Modulating patterns of two-phase flow with electric fields

Contact Info

Product

Resources

About