Role of Functionality in Cross-Stream Migration, Structures, and Dynamics of Star Polymers in Poiseuille Flow

2020 ◽  
Vol 53 (22) ◽  
pp. 9993-10004
Author(s):  
Aiqing Liu ◽  
Zhenyue Yang ◽  
Lijun Liu ◽  
Jizhong Chen ◽  
Lijia An
Keyword(s):  
Poiseuille Flow ◽  
Star Polymers ◽  
Stream Migration

scholarly journals Role of Hydrodynamic Interactions in the Deformation of Star Polymers in Poiseuille Flow

2019 ◽  
Vol 38 (4) ◽  
pp. 363-370 ◽  
Author(s):  
Zhen-Yue Yang ◽  
Xiao-Fei Tian ◽  
Li-Jun Liu ◽  
Ji-Zhong Chen
Keyword(s):  
Poiseuille Flow ◽  
Star Polymers ◽  
Hydrodynamic Interactions

Haemorheological Effects on Thrombocyte Adhesion and Aggregation Found Under Controlled Flow Conditions

1979 ◽  
Author(s):  
P.D. Richardson
Keyword(s):  
Rate Of Change ◽  
Continuous Observation ◽  
Flow Conditions ◽  
Wide Range ◽  
Stream Migration ◽  
Local Shear ◽  
Videotape Recording ◽  
Controlled Flow ◽  
A Site

Thrombocyte adhesion and aggregation in a vessel or on a chamber wall can be measured most readily if the flow is controlled and steady, and continuous observation is used. Videotape recording is very helpful for subsequent quantification of the dynamics. The adhesion of each thrombocyte can occur for a finite time interval:this interval has been observed to have a wide range. Platelets which escape often leave open a site which attracts other platelets preferentially. The rate of change of adhesion density (platelets/mm2) is affected by the local shear rate and the shear history upstream. Aggregation is affected similarly, and also proceeds with some platelet turnover. The role of erythrocytes in facilitating cross-stream migration of thrombocytes (which can enhance the growth rate of large thrombi) appears due in part to convective flow fields induced by the motion of erythrocytes in a shear flow, which can be demonstrated theoretically and experimentally. Observations of the phenomenlogy of adhesion and aggregation under controlled flow conditions and comparison with fLu id-dynamically based theory allows representation in terras of a small number of parameters with prospects of prediction of behaviour over a wide range of haemodynamic conditions; biochemical changes lead to changes in values of the parameters, so that activating agents and inhibiting agents modify values in different directions.

scholarly journals The motion of a deformable drop in a second-order fluid

1979 ◽  
Vol 92 (1) ◽  
pp. 131-170 ◽  
Author(s):  
P. C.-H. Chan ◽  
L. G. Leal
Keyword(s):  
Experimental Data ◽  
Shear Flow ◽  
Particle Velocity ◽  
Simple Shear ◽  
Poiseuille Flow ◽  
Second Order ◽  
Simple Shear Flow ◽  
Stream Migration ◽  
The Cross ◽  
Viscoelastic Rheology

The cross-stream migration of a deformable drop in a unidirectional shear flow of a second-order fluid is considered. Expressions for the particle velocity due to the separate effects of deformation and viscoelastic rheology are obtained. The direction and magnitude of migration are calculated for the particular cases of Poiseuille flow and simple shear flow and compared with experimental data.

scholarly journals Cross-stream migration of a Brownian droplet in a polymer solution under Poiseuille flow

Soft Matter ◽  
2019 ◽  
Vol 15 (15) ◽  
pp. 3168-3178 ◽  
Author(s):  
Michael P. Howard ◽  
Thomas M. Truskett ◽  
Arash Nikoubashman
Keyword(s):  
Polymer Solution ◽  
Poiseuille Flow ◽  
Polymer Solutions ◽  
Dilute Polymer Solutions ◽  
Stream Migration ◽  
Pressure Driven Flow ◽  
Pressure Driven

Dilute polymer solutions under pressure-driven flow can drive cross-stream migration of a small Brownian droplet to the centerline of a planar microchannel.

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.

The effect of uniform electric field on the cross-stream migration of a drop in plane Poiseuille flow

2016 ◽  
Vol 809 ◽  
pp. 726-774 ◽  
Author(s):  
Shubhadeep Mandal ◽  
Aditya Bandopadhyay ◽  
Suman Chakraborty
Keyword(s):  
Steady State ◽  
Electric Field ◽  
Numerical Simulations ◽  
Poiseuille Flow ◽  
Shape Deformation ◽  
Uniform Electric Field ◽  
Plane Poiseuille Flow ◽  
Stream Migration ◽  
The Cross ◽  
Transverse Position

The effect of a uniform electric field on the motion of a drop in an unbounded plane Poiseuille flow is studied analytically. The drop and suspending media are considered to be Newtonian and leaky dielectric. We solve for the two-way coupled electric and flow fields analytically by using a double asymptotic expansion for small charge convection and small shape deformation. We obtain two important mechanisms of cross-stream migration of the drop: (i) shape deformation and (ii) charge convection. The second one is a new source of cross-stream migration of the drop in plane Poiseuille flow which is due to an asymmetric charge distribution on the drop surface. Our study reveals that charge convection can cause a spherical non-deformable drop to migrate in the cross-stream direction. The combined effect of charge convection and shape deformation significantly alters the drop velocity, drop trajectory and steady state transverse position of the drop. We predict that, depending on the orientation of the applied uniform electric field and the relevant drop/medium electrohydrodynamic parameters, the drop may migrate either towards the centreline of the flow or away from it. We obtain that the final steady state transverse position of the drop is independent of its initial transverse position in the flow field. Most interestingly, we show that the drop can settle in an off-centreline steady state transverse position. Two-dimensional numerical simulations are also performed to study the drop motion in the combined presence of plane Poiseuille flow and a tilted electric field. The drop trajectory and steady state transverse position of the drop obtained from numerical simulations are in qualitative agreement with the analytical results.

scholarly journals The role of Poiseuille flow in creating depth-variation of asthenospheric shear

2012 ◽  
Vol 190 (3) ◽  
pp. 1297-1310 ◽  
Author(s):  
Svetlana I. Natarov ◽  
Clinton P. Conrad
Keyword(s):  
Poiseuille Flow ◽  
Depth Variation
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