Stretching of surface-tethered polymers in pressure-driven flow under confinement

Soft Matter ◽  
2017 ◽  
Vol 13 (36) ◽  
pp. 6189-6196 ◽  
Author(s):  
Tamal Roy ◽  
Kai Szuttor ◽  
Jens Smiatek ◽  
Christian Holm ◽  
Steffen Hardt
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Polymer Chain ◽  
Contour Length ◽  
Tethered Polymers ◽  
Wall Shear ◽  
Pressure Driven Flow ◽  
Pressure Driven

Stretching of a surface tethered polymer chain in pressure-driven flow under confinement is governed mainly by the wall shear stress and the chain contour length.

Direct Force Wall Shear Measurements in Pressure-Driven Three-Dimensional Turbulent Boundary Layers

1982 ◽  
Vol 104 (2) ◽  
pp. 150-155 ◽  
Author(s):  
J. E. McAllister ◽  
F. J. Pierce ◽  
M. H. Tennant
Keyword(s):  
Boundary Layer ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Three Dimensional ◽  
Turbulent Boundary Layers ◽  
Direct Measurements ◽  
Stress Directions ◽  
Wall Flow ◽  
Wall Shear ◽  
Pressure Driven

Unique, simultaneous direct measurements of the magnitude and direction of the local wall shear stress in a pressure-driven three-dimensional turbulent boundary layer are presented. The flow is also described with an oil streak wall flow pattern, a map of the wall shear stress-wall pressure gradient orientations, a comparison of the wall shear stress directions relative to the directions of the nearest wall velocity as measured with a typical, small boundary layer directionally sensitive claw probe, as well as limiting wall streamline directions from the oil streak patterns, and a comparison of the freestream streamlines and the wall flow streamlines. A review of corrections for direct force sensing shear meters for two-dimensional flows is presented with a brief discussion of their applicability to three-dimensional devices.

scholarly journals The Stokesian flow field of an oscillatory submerged viscous jet impinging on a planar wall

2013 ◽  
Vol 469 (2157) ◽  
pp. 20130282 ◽  
Author(s):  
A. M. J. Davis ◽  
J. H. Kim ◽  
G. M. Gunter ◽  
J. T. Ratnanather
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Flow Field ◽  
Wall Pressure ◽  
Half Cycle ◽  
Point Forces ◽  
Planar Wall ◽  
Wall Shear ◽  
Two Stages ◽  
Pressure Driven Flow

This model of experiments on auditory sensory hair cells extends previous work via distributions on a cylindrical pipe of tangentially and normally directed oscillatory point forces, which are modified to achieve no-slip at the wall in two stages. Starting with the pressure and vorticity jumps associated with the oscillatory pressure-driven flow upstream in the pipe, the adjustment of the interior pipe flow from its upstream complex-valued profile to its exit profile is fully included. This is essentially achieved by modifying the steps of the steady case analysis. The flow field oscillates with phase dependent on position, and the level curves of the streamfunction indicate instantaneous particle motion but not streamlines. Thus, an eddy is not indicated by the closed curve that occurs midway through the two half cycles and is due to competing forces between the inflow and outflow, particularly in the second half cycle as the fluid enters the pipe. The wall pressure and wall shear stress also oscillate with the non-uniformities concentrated near the origin, but are relatively damped midway through the two half cycles. Independent of the orifice location, there is a small effect of frequency on the wall pressure and the wall shear stress.

Numerical design and optimization of hydraulic resistance and wall shear stress inside pressure-driven microfluidic networks

Lab on a Chip ◽  
2015 ◽  
Vol 15 (21) ◽  
pp. 4187-4196 ◽  
Author(s):  
Hazem Salim Damiri ◽  
Hamzeh Khalid Bardaweel
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Hydraulic Resistance ◽  
Design And Optimization ◽  
Microfluidic Network ◽  
Numerical Design ◽  
Microfluidic Networks ◽  
Wall Shear ◽  
Pressure Driven

Control of total wall shear stress in ann-generation microfluidic network.

Correction: Development of a Two-Dimensional Wall Shear Stress Sensor for Wind Tunnel Applications

2019 ◽  
Author(s):  
Brett Freidkes ◽  
David A. Mills ◽  
Casey Keane ◽  
Lawrence S. Ukeiley ◽  
Mark Sheplak
Keyword(s):  
Shear Stress ◽  
Wind Tunnel ◽  
Wall Shear Stress ◽  
Two Dimensional ◽  
Stress Sensor ◽  
Shear Stress Sensor ◽  
Wall Shear
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