scholarly journals The effect of spanwise wall oscillation on turbulent pipe flow structures resulting in drag reduction

2007 ◽  
Vol 19 (12) ◽  
pp. 125107 ◽  
Author(s):  
A. Duggleby ◽  
K. S. Ball ◽  
M. R. Paul
Keyword(s):  
Drag Reduction ◽  
Pipe Flow ◽  
Turbulent Pipe Flow ◽  
Flow Structures ◽  
Wall Oscillation

scholarly journals Effects of Degradation on Drag Reduction in Turbulent Pipe Flow of Nonionic Surfactant Aqueous Solutions

2012 ◽  
Vol 40 (2) ◽  
pp. 69-77 ◽  
Author(s):  
Shinji Tamano ◽  
Kotaro Miyagawa ◽  
Yohei Morinishi ◽  
Motoyuki Itoh ◽  
Keijiro Taga
Keyword(s):  
Aqueous Solutions ◽  
Drag Reduction ◽  
Nonionic Surfactant ◽  
Pipe Flow ◽  
Turbulent Pipe Flow

Effects of Nanoparticles and Polymer Additives in Turbulent Pipe Flow

2010 ◽  
Author(s):  
Alparslan Oztekin ◽  
Sudhakar Neti ◽  
Ananchai Ukaew
Keyword(s):  
Heat Transfer ◽  
Drag Reduction ◽  
Pipe Flow ◽  
Turbulent Pipe Flow ◽  
Polymer Additives ◽  
Turbulent Structures ◽  
Heat Transfer Fluids ◽  
Pressure And Velocity Measurements ◽  
Nanosilica Particles ◽  
Elongated Nanoparticles

Spatial and temporal characteristics of turbulent pipe flows using nanofluids and dilute polymer solutions are examined by means of instantaneous differential pressure and velocity measurements. Spherical and elongated nanosilica particles (SiO2) are mixed into water to make nanofluid and polyacrylamide (PAC) is dissolved into water to make PAC solution. The effects of nanofluid on the drag reduction and turbulent structure are determined and compared with the effects of polymer additives on the turbulent structures and drag reduction. Suppression of turbulence near pipe wall was observed with the introduction of both spherical and elongated nanoparticles. Although experimental results show that nanofluids are not candidates for drag reduction unlike polymer additives, they do not increase pressure drop. Hence addition of nanoparticles into heat transfer fluids could have the potential for heat transfer enhancement in pipe flow without paying the penalty of increasing pumping power.

Drag reduction caused by the injection of polymer thread into a turbulent pipe flow

1988 ◽  
Vol 31 (9) ◽  
pp. 2518-2523 ◽  
Author(s):  
Hiromoto Usui ◽  
Katsuhiro Maeguchi ◽  
Yuji Sano
Keyword(s):  
Drag Reduction ◽  
Pipe Flow ◽  
Turbulent Pipe Flow

scholarly journals Experimental assessment of drag reduction by traveling waves in a turbulent pipe flow

2010 ◽  
Vol 22 (11) ◽  
pp. 115103 ◽  
Author(s):  
F. Auteri ◽  
A. Baron ◽  
M. Belan ◽  
G. Campanardi ◽  
M. Quadrio
Keyword(s):  
Drag Reduction ◽  
Traveling Waves ◽  
Pipe Flow ◽  
Turbulent Pipe Flow ◽  
Experimental Assessment
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