Role of Landau Damping in Crossed-Field Electron Beams and Inviscid Shear Flow

R. J. Briggs

doi:10.1063/1.1692936

Role of compatibilizer in multicomponent polymer mixtures under shear flow

Soft Matter ◽

10.1039/c2sm26342d ◽

2013 ◽

Vol 9 (1) ◽

pp. 255-260 ◽

Cited By ~ 6

Author(s):

Ruohai Guo ◽

Jialin Li ◽

Li-Tang Yan ◽

Xu-Ming Xie

Keyword(s):

Shear Flow ◽

Polymer Mixtures ◽

Multicomponent Polymer

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Dosimetry of Small Field Electron Beams

Medical Dosimetry ◽

10.1016/0958-3947(92)90023-9 ◽

1992 ◽

Vol 17 (2) ◽

pp. 107-110 ◽

Cited By ~ 8

Author(s):

Surendra N. Rustgi ◽

Kim R. Working

Keyword(s):

Electron Beams ◽

Small Field ◽

Field Electron

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THE ROLE OF NEGATIVE ENERGY WAVES IN LINEAR AND NONLINEAR SHEAR-FLOW INSTABILITY IN HYPERELASTIC FLUID-FILLED TUBES

The Quarterly Journal of Mechanics and Applied Mathematics ◽

10.1093/qjmam/46.4.657 ◽

1993 ◽

Vol 46 (4) ◽

pp. 657-681 ◽

Cited By ~ 2

Author(s):

CARMEN B. ROPCHAN ◽

GORDON E. SWATERS

Keyword(s):

Shear Flow ◽

Flow Instability ◽

Negative Energy ◽

Linear And Nonlinear ◽

Nonlinear Shear ◽

Shear Flow Instability

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Relaxation of scratch-induced surface deformation in silicate glasses: Role of densification and shear flow in lateral indentation experiments

Journal of Non-Crystalline Solids ◽

10.1016/j.jnoncrysol.2018.08.032 ◽

2018 ◽

Vol 500 ◽

pp. 382-387 ◽

Cited By ~ 12

Author(s):

Elham Moayedi ◽

Shigeki Sawamura ◽

Jana Hennig ◽

Enrico Gnecco ◽

Lothar Wondraczek

Keyword(s):

Shear Flow ◽

Surface Deformation ◽

Silicate Glasses

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Generation of Short-scale Electrostatic Fields in the Solar Atmosphere and the Role of Helium Ions

The Astrophysical Journal ◽

10.3847/1538-4357/ac05cb ◽

2021 ◽

Vol 922 (1) ◽

pp. 48

Author(s):

H. Saleem ◽

Shaukat Ali Shan ◽

A. Rehman

Keyword(s):

Shear Flow ◽

Transition Region ◽

Electric Fields ◽

Hydrogen Plasma ◽

Theoretical Models ◽

Inhomogeneous Field ◽

Helium Ions ◽

Low Frequencies ◽

Short Scale

Abstract Theoretical models are presented to show that expansion of plasma in the radial direction from a denser solar surface to a rarefied upper atmosphere with short-scale inhomogeneous field-aligned flows and currents in the form of thin threads itself is an important source of electrostatic instabilities. Multifluid theory shows that the shear flow–driven purely growing electric fields appear in the transition region. On the other hand, plasma kinetic theory predicts that the short-scale current sheets (or filaments) produce current-driven electrostatic ion acoustic (CDEIA) waves in the hydrogen plasma of the transition region that damp out in the system through wave–particle interactions and increase the temperature. Similar processes take place in the solar corona and act positively for increasing the temperature further and maintaining it. The shear flow–driven instabilities and CDEIA waves have short perpendicular wavelengths of the order of 1 m and low frequencies of the order of 1 or several Hz when the ions’ shear flow scale length is considered to be of the order of 1 km. It is pointed out that the purely growing fluid instabilities turn into oscillatory instabilities and the growth rates of kinetic CDEIA wave instabilities are reduced when the dynamics of 10% helium ions is taken into account along with 90% hydrogen ions. Therefore, the role of helium ions should not be ignored in the study of wave dynamics in solar plasma.

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Direct Numerical Simulation of Drops in Three Dimensional Viscoelastic Simple Shear Flows

10.1115/imece2001/fed-24916 ◽

2001 ◽

Author(s):

Shriram B. Pillapakkam ◽

Pushpendra Singh

Keyword(s):

Numerical Simulation ◽

Shear Flow ◽

Direct Numerical Simulation ◽

Viscoelastic Fluid ◽

Simple Shear ◽

Polymer Concentration ◽

Three Dimensional ◽

Simple Shear Flow ◽

Splitting Technique

Abstract A three dimensional finite element scheme for Direct Numerical Simulation (DNS) of viscoelastic two phase flows is implemented. The scheme uses the Level Set Method to track the interface and the Marchuk-Yanenko operator splitting technique to decouple the difficulties associated with the governing equations. Using this numerical scheme, the shape of Newtonian drops in a simple shear flow of viscoelastic fluid and vice versa are analyzed as a function of Capillary number, Deborah number and polymer concentration. The viscoelastic fluid is modeled via the Oldroyd-B model. The role of viscoelastic stresses in deformation of a drop subjected to simple shear flow and its effect on the steady state shape is analyzed. Our results compare favorably with existing experimental data and also help in understanding the role of viscoelastic stresses in drop deformation.

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