Journal of Power System Engineering (동력기계공학회지)
- Volume 5 Issue 3
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- Pages.31-37
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- 2001
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- 2713-8429(pISSN)
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- 2713-8437(eISSN)
A Study on the Turbulence Enhancement of Jet Flow by the Ultrasonic Forcing in a Coaxial Circular Pipe
동심원관내에서 초음파가진에 의한 제트유동의 난류증진에 관한 연구
Abstract
A study to obtain the enhancement of turbulence at low Reynolds number is carried out by adding ultrasonic force into the jet flow field of a coaxial circular pipe which can afford the sufficient data of flow characteristics with the shear flow and turbulence flow in spite of its simple shape. A coaxial circular flow field is made vertically in a large and transparent acryl tank. The time mean velocity vector, distribution, kinetic energy and turbulence intensity formed in the complex flow field of turbulence enhancement are investigated, observed and discussed at Reynolds number of 2,000, 3,000 and 5,000 by using PIV measurement, in results, the validity of ultrasonic to obtain the enhancement of turbulence is certified.
Keywords