Strong shear flows release gaseous nuclei from surface micro- and nanobubbles

2021 ◽  
Vol 6 (4) ◽  
Author(s):  
Zibo Ren ◽  
Shuhong Liu ◽  
Beng Hau Tan ◽  
Fabian Denner ◽  
Fabien Evrard ◽  
...  
Keyword(s):  
Shear Flows ◽  
Strong Shear

scholarly journals Coupling between reconnection and Kelvin-Helmholtz instabilities in collisionless plasmas

2009 ◽  
Vol 16 (2) ◽  
pp. 241-249 ◽  
Author(s):  
D. Grasso ◽  
D. Borgogno ◽  
F. Pegoraro ◽  
E. Tassi
Keyword(s):  
Current Density ◽  
Shear Flows ◽  
Field Model ◽  
Collisionless Plasma ◽  
Three Dimensional ◽  
Dynamical Evolution ◽  
Turbulent Regime ◽  
Helmholtz Instability ◽  
Collisionless Plasmas ◽  
Strong Shear

Abstract. In a collisionless plasma, when reconnection instability takes place, strong shear flows may develop. Under appropriate conditions these shear flows become unstable to the Kelvin-Helmholtz instability. Here, we investigate the coupling between these instabilities in the framework of a four-field model. Firstly, we recover the known results in the low β limit, β being the ratio between the plasma and the magnetic pressure. We concentrate our attention on the dynamical evolution of the current density and vorticity sheets which evolve coupled together according to a laminar or a turbulent regime. A three-dimensional extension in this limit is also discussed. Secondly, we consider finite values of the β parameter, allowing for compression of the magnetic and velocity fields along the ignorable direction. We find that the current density and vorticity sheets now evolve separately. The Kelvin-Helmholtz instability involves only the vorticity field, which ends up in a turbulent regime, while the current density maintains a laminar structure.

Deformation of grafted polymer layers in strong shear flows

1996 ◽  
Vol 53 (4) ◽  
pp. 3782-3787 ◽  
Author(s):  
J. L. Harden ◽  
M. E. Cates
Keyword(s):  
Shear Flows ◽  
Polymer Layers ◽  
Grafted Polymer ◽  
Strong Shear

Casuality in strong shear flows

1994 ◽  
Vol 431 ◽  
pp. 359 ◽  
Author(s):  
Ramesh Narayan ◽  
Abraham Loeb ◽  
Pawan Kumar
Keyword(s):  
Shear Flows ◽  
Strong Shear

scholarly journals Asymmetric Lipid Membranes under Shear Flows: A Dissipative Particle Dynamics Study

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 655
Author(s):  
Yanying Chen ◽  
Zhenguo Wang ◽  
Yongyun Ji ◽  
Linli He ◽  
Xianghong Wang ◽  
...  
Keyword(s):  
Shear Flow ◽  
Lipid Membranes ◽  
Shear Flows ◽  
Dissipative Particle Dynamics ◽  
Particle Dynamics ◽  
Dynamics Simulation ◽  
Absolute Pressure ◽  
Asymmetric Membranes ◽  
Strong Shear ◽  
Different Types

We investigate the phase behavior of the asymmetric lipid membranes under shear flows, using the dissipative particle dynamics simulation. Two cases, the weak and strong shear flows, are considered for the asymmetric lipid microstructures. Three typical asymmetric structures, the membranes, tubes, and vesicle, are included in the phase diagrams, where the effect of two different types of lipid chain length on the formation of asymmetric membranes is evaluated. The dynamic processes are demonstrated for the asymmetric membranes by calculating the average radius of gyration and shape factor. The result indicates that different shear flows will affect the shape of the second type of lipid molecules; the shape of the first type of lipid molecules is more stable than that of the second type of lipid molecules. The mechanical properties are investigated for the asymmetric membranes by analyzing the interface tension. The results reveal an absolute pressure at the junctions of different types of particles under the weak shear flow; the other positions are almost in a state of no pressure; there is almost no pressure inside the asymmetric lipid membrane structure under the strong shear flow. The findings will help us to understand the potential applications of asymmetric lipid microstructures in the biological and medical fields.

scholarly journals Microstructure and thickening of dense suspensions under extensional and shear flows

2017 ◽  
Vol 825 ◽  
Author(s):  
Ryohei Seto ◽  
Giulio G. Giusteri ◽  
Antonio Martiniello
Keyword(s):  
Numerical Simulation ◽  
Rheological Properties ◽  
Normal Stress ◽  
Shear Flows ◽  
Shear Thickening ◽  
Newtonian Fluids ◽  
Flow Type ◽  
Dense Suspensions ◽  
Strong Shear ◽  
Normal Stress Differences

Dense suspensions are non-Newtonian fluids that exhibit strong shear thickening and normal stress differences. Using numerical simulation of extensional and shear flows, we investigate how rheological properties are determined by the microstructure that is built under flows and by the interactions between particles. By imposing extensional and shear flows, we can assess the degree of flow-type dependence in regimes below and above thickening. Even when the flow-type dependence is hindered, non-dissipative responses, such as normal stress differences, are present and characterise the non-Newtonian behaviour of dense suspensions.

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