International Journal of Air-Conditioning and Refrigeration
- 제9권2호
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- Pages.36-43
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- 2001
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- 2010-1325(pISSN)
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- 2010-1333(eISSN)
Study on Laminar Heat Transfer Enhancement by Twisted-Inserts
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Kwon, Young-Chel
(Department of Mechanical Engineering, Sunmoon University) ;
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Chang, Keun-Sun
(Department of Mechanical Engineering, Sunmoon University) ;
- Jeong, Ji-Hwan (Department of Environmental Management, Cheonan College )
- 발행 : 2001.06.01
초록
In order to understand the laminar heat transfer enhancement by swirl flow, the effects of heat transfer in a circular pipe with twisted inserts are investigated experimentally. In the present study, a uniform heat flux condition is considered. Laminar heat transfer correlations are developed using least square fit method from surface temperature distributions of an electrically-heated pipe and flow properties. Average Nusselt number correlations with twisted inserts are expressed as a function of swirl parameter, Reynolds number and prand시 number. When the twisted ratio is 6.50, mean Nusselt number and friction factor increase by approximately 500% and 300%, respectively, compared with the values for a pipe without inserts.