Wall turbulence eddy structure control by a group of heating wires

2002 ◽  
Author(s):  
N. Jiang ◽  
Y. Lian ◽  
Wei Shu ◽  
Zhi Wang
Keyword(s):  
Wall Turbulence ◽  
Structure Control ◽  
Eddy Structure

Enhancement of Turbulent Shear Stress and Mass Transfer in Wall Turbulence Accompanied With Wall Blowing

2016 ◽  
Author(s):  
Yushi Okamura ◽  
Hideaki Sugioka ◽  
Yasuo Kawaguchi
Keyword(s):  
Mass Transfer ◽  
Shear Stress ◽  
Spatial Distribution ◽  
Solid Wall ◽  
Structural Parameters ◽  
Wall Turbulence ◽  
Experimental Result ◽  
Turbulent Shear ◽  
Eddy Structure ◽  
Turbulent Schmidt Number

Spatial distribution of velocity and mass concentration fluctuation in turbulent channel flow with wall blowing were simultaneously measured by PIV/PLIF. The recorded pictures were analyzed to clarify the turbulent momentum and mass transfer from statistical view point and from spatial evolution of coherent eddy structure. Experimental result revealed that the Reynold shear stress and turbulent intensity are enhanced as the blowing rate increasing. On the other hand, structural parameters based on local turbulence such as turbulent Schmidt number and a degree of turbulent anisotropy is not affected by wall blowing. In comparison without wall blowing, we found that the turbulent eddy structure locates apart from the wall. Besides, energy spectrum and swirling strength is also enhanced by wall blowing. It is associated with increase of resistance by wall blowing. Generally in wall turbulence, fluctuation motions are restricted by the presence of solid wall. But for the blowing from the wall relaxes this restriction and Reynolds shear stress is enhanced, which leads to enhancement of turbulent mass flux. Moreover, from results of spatial distribution of instantaneous fields, wall-blowing helps development of hairpin vortexes. It is concluded that development of hairpins leads to enhancement of turbulent mass transfer.

Carborane–Siloxanes: Synthesis and Properties. New Possibilities for Structure Control

INEOS OPEN ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. 71-84 ◽  
Author(s):  
A. A. Anisimov ◽  
◽  
A. V. Zaitsev ◽  
V. A. Ol'shevskaya ◽  
M. I. Buzin ◽  
...  
Keyword(s):  
Structure Control

Steric Inner Structure Control of Fine Particles by Spinodal Decomposition as Shape Regulation Preparation.

1999 ◽  
Vol 115 (6) ◽  
pp. 475-480
Author(s):  
Tatsuo YAMAGUCHI ◽  
Toshiaki NAKAI ◽  
Naoya ASANUMA ◽  
Sachiko ONO ◽  
Kunihiko TAKEDA
Keyword(s):  
Spinodal Decomposition ◽  
Fine Particles ◽  
Structure Control
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