The Coanda effect, which was first named by Henri Coanda in 1910, is the phenomenon when a fluid, gas or liquid, attaches to a solid surface, called the Coanda surface. The direction of this adhered flow changes along with the surface because of the Van der Walls forces or surface tension. Therefore, the pressure distribution of the ambient fluid is also altered due to the bent attached Coanda flow. The fluid material properties, Coanda flow velocity, curvature of the Coanda surface, velocity of the ambient fluid flow, and distance to the wall above the Coanda flow are the primary factors affecting this pressure distribution. In experimental studies, Panitz and Wasan [1] evaluated the pressure distribution of the Coanda effect by using pressure sensors on the Coanda surface and a colored dye solution in the flow. By means of photographs and experimental data, they describe the influence of different heights of the shroud (a sheath plate above the Coanda surface) and the secondary flow entrainment (flow of ambient fluid) on the pressure profiles. Vortices occur beneath the Coanda flow when the height of the shroud is lower than a specified reference. Cutbill et al. [2] developed a high speed Coanda flow k-ε turbulence model in the application of PHOENICS to improve the prediction of the mixing rate, shock wave structure and flow separation. The pressure drop occurs near the Coanda surface in both experimental and computational prediction results.
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ASME 2009 Summer Bioengineering Conference
June 17–21, 2009
Lake Tahoe, California, USA
Conference Sponsors:
- Bioengineering Division
ISBN:
978-0-7918-4891-3
PROCEEDINGS PAPER
A New Concept in Design of Rheolytic Thrombectomy Devices: The Coanda Effect
Cheng-Shiu Chung,
Cheng-Shiu Chung
Carnegie Mellon University, Pittsburgh, PA
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Sergio L. Cornejo,
Sergio L. Cornejo
Carnegie Mellon University, Pittsburgh, PA
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Ming Huo,
Ming Huo
Carnegie Mellon University, Pittsburgh, PA
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Ender A. Finol
Ender A. Finol
Carnegie Mellon University, Pittsburgh, PA
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Cheng-Shiu Chung
Carnegie Mellon University, Pittsburgh, PA
Sergio L. Cornejo
Carnegie Mellon University, Pittsburgh, PA
Ming Huo
Carnegie Mellon University, Pittsburgh, PA
Ender A. Finol
Carnegie Mellon University, Pittsburgh, PA
Paper No:
SBC2009-203532, pp. 419-420; 2 pages
Published Online:
July 19, 2013
Citation
Chung, C, Cornejo, SL, Huo, M, & Finol, EA. "A New Concept in Design of Rheolytic Thrombectomy Devices: The Coanda Effect." Proceedings of the ASME 2009 Summer Bioengineering Conference. ASME 2009 Summer Bioengineering Conference, Parts A and B. Lake Tahoe, California, USA. June 17–21, 2009. pp. 419-420. ASME. https://doi.org/10.1115/SBC2009-203532
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