A REVIEW OF FLOW VISUALIZATION TECHNIQUES FOR SWIRLING FLOW IN A CIRCULAR TUBE

2011 ◽  
Vol 18 (4) ◽  
pp. 291-310
Author(s):  
Tae-Hyun Chang ◽  
Kwon-Soo Lee
Keyword(s):  
Flow Visualization ◽  
Swirling Flow ◽  
Circular Tube ◽  
Visualization Techniques

Characterization and Optimization of the Flow Pattern Inside a Diaphragm Blood Pump Based on Flow Visualization Techniques

ASAIO Journal ◽  
1998 ◽  
Vol 44 (5) ◽  
pp. M714-M718 ◽  
Author(s):  
Masako Nakata ◽  
Toru Masuzawa ◽  
Eisuke Tatsumi ◽  
Yoshiyuki Taenaka ◽  
Takashi Nishimura ◽  
...  
Keyword(s):  
Flow Visualization ◽  
Flow Pattern ◽  
Blood Pump ◽  
Visualization Techniques

Heat Transfer Augmentation and Flow Visualization With Delta Winglets in a Tube: A Numerical Approach

2020 ◽  
Author(s):  
Md. Islam ◽  
Liang Guangda ◽  
Md. Mahbub Alam
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Thermal Performance ◽  
Performance Enhancement ◽  
Swirling Flow ◽  
Circular Tube ◽  
Vortex Generator ◽  
Attack Angle ◽  
Maximum Enhancement ◽  
Longitudinal Vortices

Abstract In this research, heat transfer and pressure penalty from a circular tube with delta winglets insert are numerically investigated through Computational Fluid Dynamics (CFD) methodology. Numerical analysis with and without vortex generators (VGs) insert in a tube are done for a turbulent air flow, Reynolds number ranging from 6000 to 33000, under constant heat flux condition on the circular tube model surface. In our current research, we employed the shear stress transport (SST) k-omega model. The Nusselt number and friction factor results show the influence of the VGs insert on thermal performance. Effects of different winglet attack angles and blockage ratios on thermal performance enhancement were examined. Thermal performance is enhanced 5.1–30.7% using winglets in a tube. It is observed that small blockage ratio, B = 0.1 performed better than its counterpart of 0.2 and 0.3 for all the Reynolds number and for the same attack angle. The attack angle β = 15° and 30° showed better thermal performance enhancement at lower Re while at higher Re, β = 15° showed better performance. The maximum enhancement obtained for β = 30° and B = 0.1. Winglet vortex generator could create swirling flow when attack angle is 0 or 15°. When attack angle is increased, both swirling flow and longitudinal vortices appeared. At attack angle of 45°, large longitudinal vortices was found.

Near field placement of error sensors in an active noise control application of axial cooling fans using flow visualization techniques

2007 ◽  
Vol 121 (5) ◽  
pp. 3180-3180
Author(s):  
Connor R. Duke ◽  
Scott L. Thomson ◽  
Scott D. Sommerfeldt ◽  
Kent L. Gee ◽  
Cole L. Duke ◽  
...  
Keyword(s):  
Flow Visualization ◽  
Noise Control ◽  
Near Field ◽  
Active Noise Control ◽  
Field Placement ◽  
Active Noise ◽  
Cooling Fans ◽  
Visualization Techniques ◽  
Control Application
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