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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

INVESTIGATION OF HEAT TRANSFER COEFFICIENT FOR NON-CIRCULAR DUCT WITH TWISTED TAPE INSERT

R. J. Yadav
Department of Mechanical Engineering, MIT College of Engineering, SPPU,Pune, India

Prathmesh Joshi
Department of Mechanical Engineering, MIT College of Engineering, SPPU, Pune, India

Sandip Kore
Department of Mechanical Engineering, SAE, Kondhwa, SPPU, Pune India

D. A. Kamble
Department of Mechanical Engineering, PDEA's COE, Manjari, SPPU, Pune India

Abstract

Heat transfer and pressure drop characteristics in a circular tube and non-circular duct (square and hexagonal) with twisted tapes have been investigated experimentally using air as working fluid for the Reynolds number in the range of 800 to 1,05,000. The swirl was generated by tape inserts of various twist ratios. The various twist ratio considered for the study are (Y = 3.5, 4.5, 5.5, 6.5). The width of the tape used was 34 mm. The heat transfer test section was heated electrically using Nichrome wire, imposing axially and circumferentially constant wall heat flux (UHF) boundary condition. The length of the test section used was one meter. The circular tube and non-circular duct have same hydraulic diameter of 35 mm. The heat transfer and pressure drop characteristics were compared for various ducts. Both pressure drop and heat transfer increase as the twist ratio (Y) decrease. The highest Nusselt number is obtained for twist ratio of 3.5 for each duct. For the same test conditions Nusselt number and friction factor increases as the number of side increase of non-circular duct. The maximum Nusselt number and pressure drop is observed in case of circular tube.

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