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Research Papers

Heat Transfer Enhancement of Laminar Flow Through a Circular Tube Having Wire Coil Inserts and Fitted With Center-Cleared Twisted Tape

[+] Author and Article Information
Sujoy Kumar Saha

Bikash Kumar Barman, Soumitra Banerjee

Mechanical Engineering Department,  Bengal Engineering and Science University, Shibpur, Howrah 711 103, West Bengal, India

J. Thermal Sci. Eng. Appl 4(3), 031003 (Jul 12, 2012) (9 pages) doi:10.1115/1.4006289 History: Received September 13, 2011; Revised February 08, 2012; Published July 12, 2012; Online July 12, 2012

The experimental friction factor and Nusselt number data for laminar flow through a circular duct having wire coil inserts and fitted with center-cleared twisted tape have been presented. Predictive friction factor and Nusselt number correlations have also been presented. The thermohydraulic performance has been evaluated. The major findings of this experimental investigation are the center-cleared twisted tapes in combination with wire coil inserts perform better than the individual enhancement technique acting alone for laminar flow through a circular duct up to a certain amount of center-clearance.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Circular duct having wire coil insert

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Figure 2

(a) Layout of a circular duct containing a full-length twisted tape (full width and no center-clearance). (b) Circular duct having full-length twisted tape (with center-clearance).

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Figure 3

Schematic diagram of the experimental rig

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Figure 4

Pressure drop experimental setup

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Figure 5

Heat transfer experimental setup

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Figure 6

Effect of center-clearance of twisted tape on friction factor—coil helix angle = 60 deg, d/Dh  = 0.07692

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Figure 7

Effect of coil helix angle on friction factor; c = 0.4, d/Dh  = 0.1026

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Figure 8

Effect of coil wire diameter on friction factor—coil helix angle = 30 deg, c = 0.6

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Figure 9

Comparison of present experimental friction factor data with the experimental friction factor data, Eq. 4 of Ref. [4]

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Figure 10

Effect of center-clearance of twisted tape on Nuselt number—coil helix angle = 60 deg, d/Dh  = 0.1026

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Figure 11

Effect of coil helix angle on Nusselt number; c = 0.4, d/Dh  = 0.07692

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Figure 12

Effect of coil wire diameter on Nusselt number—corrugation angle = 30 deg, c = 0.6

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Figure 13

Comparison of present experimental Nusselt number data with the experimental Nusselt number data, Eq. 3 of Ref. [4]

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