Prediction of Swirl Flow and Heat Transfer through Square Duct with Twisted Tape Insert

Ho Keun Kang; Soo Whan Ahn; Myung Sung Lee

doi:10.4028/www.scientific.net/AMM.284-287.888

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 284-287Prediction of Swirl Flow and Heat Transfer through...

Prediction of Swirl Flow and Heat Transfer through Square Duct with Twisted Tape Insert

Abstract:

Numerical predictions of characteristics of turbulent flows through a square duct (30 30 mm) with twisted tape inserts and with twisted tape inserts plus interrupted ribs are conducted to investigate regionally averaged heat transfer and friction factors by using CFX 11.0 commercial code. The validity of the numerical results is confirmed by measurement. Reynolds numbers are varied between 8,900 and 29,000. A rib height-to-channel hydraulic diameter (e/Dh) of 0.067 and a length-to hydraulic diameter (L/Dh) of 30 are considered. The square ribs are arranged to follow the trace of the twisted tape and along the flow direction defined as axial interrupted ribs. The twisted tape is 0.1 mm thick carbon steel sheet with diameter of 28mm, length of 900mm and 2.5 turns. Each wall of the square channel is composed of the isolated aluminum section. The present study demonstrates that the twisted tape with interrupted ribs provides a greater overall heat transfer performance over the twisted tape with no ribs in the square duct.

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Periodical:

Applied Mechanics and Materials (Volumes 284-287)

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888-893

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.284-287.888

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Online since:

January 2013

Authors:

Ho Keun Kang, Soo Whan Ahn, Myung Sung Lee

Keywords:

Flow Pattern, Friction Factor, Heat Transfer, Ribbed Square Duct, Twisted Tape

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