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Research Papers

Laminar Flow Through a Circular Tube Having Transverse Ribs and Twisted Tapes

[+] Author and Article Information
Manvendra Tiwari

Department of Mechanical Engineering,
Indian Institute of Engineering Science
and Technology,
Shibpur, Howrah,
West Bengal 711103, India
e-mail: manvendrabesu@gmail.com

Sujoy Kumar Saha

Department of Mechanical Engineering,
Indian Institute of Engineering Science
and Technology,
Shibpur, Howrah,
West Bengal 711103, India
e-mail: sujoy_k_saha@hotmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received March 23, 2014; final manuscript received May 23, 2015; published online June 30, 2015. Assoc. Editor: Arun Muley.

J. Thermal Sci. Eng. Appl 7(4), 041009 (Dec 01, 2015) (9 pages) Paper No: TSEA-14-1055; doi: 10.1115/1.4030792 History: Received March 23, 2014; Revised May 23, 2015; Online June 30, 2015

The experimental friction factor and Nusselt number data for laminar flow of viscous oil through a circular duct having integral transverse rib roughness and fitted with twisted tapes with oblique teeth 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 twisted tapes with oblique teeth in combination with integral transverse rib roughness perform significantly better than the individual enhancement technique acting alone for laminar flow through a circular duct up to a certain value of fin parameter.

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References

Figures

Grahic Jump Location
Fig. 7

Effect of rib pitch, y = 2.5, thl = 0.05263, ⊖ = 30 deg, and e/Dh = 0.07692 (friction factor)

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Fig. 8

Effect of rib height, y = 2.5, thl = 0.1053, ⊖ = 60 deg, and P/e = 5.6481 (friction factor)

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Fig. 9

Comparison of present experimental friction factor data with the correlation, Eq. (2) (P/e = 5.6481)

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Fig. 10

Effect of tooth horizontal length and the tooth angle of the twisted-tape oblique teeth; y = 2.5, P/e = 2.0437, and e/Dh = 0.07692 (Nusselt number)

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Fig. 11

Effect of rib height, y = 2.5, thl = 0.1053, ⊖ = 60 deg, and P/e = 5.6481 (Nusselt number)

Grahic Jump Location
Fig. 12

Effect of rib pitch, y = 2.5, thl = 0.05263, ⊖ = 30 deg, and e/Dh = 0.07692 (Nusselt number)

Grahic Jump Location
Fig. 13

Comparison of present experimental Nusselt number data with correlation, Eq. (5) (P/e = 5.6481)

Grahic Jump Location
Fig. 6

Effect of tooth horizontal length and the tooth angle of the twisted-tape oblique teeth; y = 2.5, P/e = 2.0437, and e/Dh = 0.07692 (friction factor)

Grahic Jump Location
Fig. 5

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

Grahic Jump Location
Fig. 4

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

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Fig. 3

Schematic diagram of the experimental rig

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Fig. 2

(a) Full-length twisted-tape (without oblique teeth) insert inside a duct, (b) full-length twisted-tape with oblique teeth, and (c) detail A of Fig. 1(b)

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Fig. 1

Integral transverse rib roughness in a circular duct

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