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Fundamental Issues and Canonical Flows

Friction and Thermal Characteristics of Laminar Flow of Viscous Oil Through a Circular Tube Having Axial Corrugations and Fitted With Helical Screw-Tape Inserts

[+] Author and Article Information
Sujoy Kumar Saha

Mechanical Engineering Department,  Bengal Engineering and Science, University Shibpur, Howrah 711 103, Indiasujoy_k_saha@hotmail.com

Bikram Narayan Swain, G. L. Dayanidhi

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

J. Fluids Eng 134(5), 051210 (May 22, 2012) (9 pages) doi:10.1115/1.4006669 History: Received December 13, 2011; Revised April 18, 2012; Published May 18, 2012; Online May 22, 2012

The experimental friction factor and Nusselt number data for a laminar flow through a circular duct having axial corrugation and fitted with helical screw-tape inserts 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 that the helical screw-tape inserts, in combination with axial corrugation, perform better than the individual enhancement technique acting alone for laminar flow through a circular duct.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Axially corrugated circular duct

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Figure 2

Layout of a circular duct with full-length fin insert:(a) helical screw-tape, and (b) twisted-tape

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Figure 3

Schematic diagram of the experimental rig

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Figure 4

Validation of the experimental setup: comparison of present experimental friction factor data with plain circular tube data

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Figure 5

Validation of the experimental setup: comparison of present experimental Nusselt number data with plain circular tube data

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Figure 6

Effect of the helical screw-tape parameter on the friction factor: corrugation angle = 60 deg, P/e = 2.0437

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Figure 7

Effect of the corrugation angle on the friction factor: p = 0.31, P/e = 2.0437

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Figure 8

Effect of the corrugation pitch on the friction factor: corrugation angle = 30 deg, p = 0.25

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Figure 9

Effect of the helical screw-tape parameter on the Nusselt number: corrugation angle = 60 deg, P/e = 2.0437

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Figure 10

Effect of the corrugation angle on the Nusselt number: p = 0.31, P/e = 2.0437

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Figure 11

Effect of the corrugation pitch on the Nusselt number:corrugation angle = 30 deg, p = 0.25

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