Velocity Space Description of Certain Turbulent Free Shear Flow Characteristics

AIAA Journal ◽  
1981 ◽  
Vol 19 (8) ◽  
pp. 969-975 ◽  
Author(s):  
R. J. Bywater
Keyword(s):  
Shear Flow ◽  
Flow Characteristics ◽  
Velocity Space ◽  
Space Description

Characteristics of Planar Counter Current Shear Flow in Dump Geometry

2011 ◽  
Author(s):  
Prasad Kalghatgi ◽  
Sumanta Acharya ◽  
Paul Strykowski ◽  
Matt Anderson
Keyword(s):  
Shear Flow ◽  
Mass Flow ◽  
Velocity Ratio ◽  
Spectral Characteristics ◽  
Flow Characteristics ◽  
Control Flow ◽  
Mean Flow ◽  
Global Mode ◽  
Instability Modes ◽  
Countercurrent Shear

Countercurrent shear can be used in engineering applications to control flow structure and mixing. In the present paper a planar countercurrent shear flow is studied numerically using Large Eddy Simulation. Mean flow characteristics at a primary-jet Reynolds number of 14700 are studied for three values of a key parameter, the secondary to primary jet mass flow ratio (m˙s/m˙p), chosen to match reported measurements. The predicted flow results of time averaged flow field, Strouhal number and turbulence characteristics are compared with the experimentally available data. A change in instability modes is observed at mass flow ratios above m˙s/m˙p = 0.27 with more than 100% increase in the turbulence levels and distinct changes in spectral characteristics. Detailed spectral records along with landau modeling are used as evidence of existence of self excited global mode beyond a critical velocity ratio in the flow.

scholarly journals Shear flow characteristics of densely packed granular material subjected to slow deformations

2013 ◽  
Vol 46 ◽  
Author(s):  
Subodh Dhakal
Keyword(s):  
Shear Flow ◽  
High Speed ◽  
Rotational Velocity ◽  
Flow Characteristics ◽  
Video Camera ◽  
Rotation Group ◽  
Particle Rotation ◽  
Moving Wall ◽  
High Speed Video Camera ◽  
Jammed State

The densely packed assembly of granular materials subjected to slow deformations is studied experimentally in the 2D shear flow apparatus. High speed video camera and subsequent image processing techniques help to document the positions of the particles in the flow. Effective algorithms are formulated to determine the particle rotation, group size and local particle concentrations. Experimental results depict that the consecutive cycles of solid like (jammed) and fluid like (un-jammed) states characterize the flow. The jammed state is represented by negligible mobilization of particles, whereas the un-jammed state is represented by considerable mobilization of particles. The rotational and translational kinetic energy shares their dominancy in the jammed and un-jammed states respectively. Nevertheless, rotational counterpart also increases quite high in un-jammed state. There exists clearly a gradient of translational and rotational velocity across the shear cell especially in the un-jammed state indicating the phenomenon of strain localization. The un-jammed state originates because of the breaking and buckling of few columns near to the inner moving wall as noticed by previous researchers, and the jammed state regenerates once the broken and buckled columns regrouped into new columns. The dilatation phenomenon is found to be associated with the un-jamming states indicated by the drop in the local particle concentrations.

scholarly journals Effect of Shear Flow on Flow Characteristics of The PTC Cylinder

2019 ◽  
Vol 531 ◽  
pp. 012063
Author(s):  
Dahai Zhang ◽  
Tianjiao Li ◽  
Lei Feng ◽  
Wenxiu Huang ◽  
Chunning Ji
Keyword(s):  
Shear Flow ◽  
Flow Characteristics

The High Shear Stress Rheology of Liquid Lubricants at Pressures of 2 to 200 MPa

1990 ◽  
Vol 112 (2) ◽  
pp. 246-252 ◽  
Author(s):  
S. Bair ◽  
W. O. Winer
Keyword(s):  
Shear Stress ◽  
Glass Transition ◽  
Shear Flow ◽  
Flow Characteristics ◽  
Steady Shear ◽  
Shear Stresses ◽  
High Shear ◽  
High Shear Stress ◽  
Limiting Shear Stress ◽  
Steady Shear Flow

The steady shear flow characteristics of two liquid lubricants were measured in a new rheometer at shear stresses to 10 MPa. All measurements were performed well below the glass transition pressure. Both Newtonian and rate-independent (limiting shear stress) behaivor was observed.

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