Lateral migration of viscoelastic droplets in a viscoelastic confined flow: role of discrete phase viscoelasticity

Soft Matter ◽  
2019 ◽  
Vol 15 (44) ◽  
pp. 9003-9010 ◽  
Author(s):  
Shamik Hazra ◽  
Sushanta K. Mitra ◽  
Ashis Kumar Sen
Keyword(s):  
Poiseuille Flow ◽  
Viscoelastic Medium ◽  
Lift Force ◽  
Reynolds Numbers ◽  
Lateral Migration ◽  
Low Reynolds Numbers ◽  
Confined Flow ◽  
Discrete Phase ◽  
Droplet Phase

We study wall and center migration of viscoelastic droplets in a Poiseuille flow of viscoelastic medium (PVP) at low Reynolds numbers (Re ≪ 1) and propose the existence of a new lift force whose origin lies in the viscoelasticity of the droplet phase.

SPH simulations of time-dependent Poiseuille flow at low Reynolds numbers

2003 ◽  
Vol 191 (2) ◽  
pp. 622-638 ◽  
Author(s):  
Leonardo Di G. Sigalotti ◽  
Jaime Klapp ◽  
Eloy Sira ◽  
Yasmin Meleán ◽  
Anwar Hasmy
Keyword(s):  
Poiseuille Flow ◽  
Reynolds Numbers ◽  
Time Dependent ◽  
Low Reynolds Numbers ◽  
Low Reynolds

Eigenvalue Sensitivity to Base Flow Variations in Hagen-Poiseuille Flow

2002 ◽  
Author(s):  
Isabella M. Gavarini ◽  
Alessandro Bottaro ◽  
Frans T. M. Nieuwstadt
Keyword(s):  
Poiseuille Flow ◽  
Pipe Flow ◽  
Reynolds Numbers ◽  
Base Flow ◽  
Transient Growth ◽  
Cylindrical Pipe ◽  
Low Reynolds Numbers ◽  
Parabolic Profile ◽  
Eigenvalue Sensitivity ◽  
The Ideal

Transition in a cylindrical pipe flow still eludes thorough understanding. Most recent advances are based on the concept of transient growth of disturbances, but even this scenario is not fully confirmed by DNS and/or experiments. Based on the fact that even the most carefully conducted experiment is biased by uncertainties, we explore the spatial growth of disturbances developing on top of an almost ideal, axially invariant Poiseuille flow. The optimal deviation of the base flow from the ideal parabolic profile is computed by a variational tecnique, and unstable modes, driven by an inviscid mechanism, are found to exist for very small values of the norm of the deviation, at low Reynolds numbers.

Some new characteristics of the confined flow over circular cylinders at low reynolds numbers

2020 ◽  
Vol 86 ◽  
pp. 108741
Author(s):  
A. Ooi ◽  
L. Chan ◽  
D. Aljubaili ◽  
C. Mamon ◽  
J.S. Leontini ◽  
...  
Keyword(s):  
Reynolds Numbers ◽  
Circular Cylinders ◽  
Low Reynolds Numbers ◽  
Confined Flow ◽  
Low Reynolds

Lift force on rotating sphere at low Reynolds numbers and high rotational speeds

2003 ◽  
Vol 19 (4) ◽  
pp. 300-307 ◽  
Author(s):  
You Changfu ◽  
Qi Haiying ◽  
Xu Xuchang
Keyword(s):  
Lift Force ◽  
Reynolds Numbers ◽  
Low Reynolds Numbers ◽  
Rotating Sphere ◽  
Low Reynolds

Lateral Migration of Neutrally-Buoyant Particles in a Square Microchannel at Low Reynolds Numbers

2009 ◽  
Author(s):  
Byung Rae Cho ◽  
Young Won Kim ◽  
Jung Yul Yoo
Keyword(s):  
Reynolds Numbers ◽  
Spherical Particles ◽  
Channel Cross Section ◽  
Microfluidic Channels ◽  
Lateral Migration ◽  
Low Reynolds Numbers ◽  
Low Reynolds ◽  
Square Microchannel ◽  
External Forces ◽  
Neutrally Buoyant

Lateral migration of particles has drawn a lot of attention in suspension community for the last 50 years. Since there is no need for extra external forces, lateral migration of particles plays an important role in constructing microfluidic devices in diverse engineering applications. In this paper, an experimental study on lateral migration of neutrally-buoyant spherical particles transported through a square microchannel is carried out using a fluorescent microscope at low Reynolds numbers. Fluorescent microspheres with diameters of d = 6 μm, 10 μm, and 16 μm are adopted as the test particles, which yield channel-to-particle size ratios of 13.3, 8 and 5, respectively. Spatial distributions of the particles in dilute suspension are visualized at different Reynolds numbers. It is shown that particles are uniformly distributed over the channel cross-section at relatively low Reynolds numbers. As the Reynolds number increases, however, particles migrate inward from the wall and away from the central axis of the channel, so that consequently they accumulate at an equilibrium position, exhibiting the so-called “tubular pinch effect”, first observed by Segre´ and Silberberg as early as in 1962. Experimental results obtained in this work offer design rules for microfluidic channels that play important roles of particle separation or particle focusing.

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