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Research Papers

Heat Transfer Enhancement of Double-Tube-Type Heat Exchanger by Petal-Shaped Tube (Study on Optimum Tube Shape)

[+] Author and Article Information
Toshihiko Shakouchi

Professor
Graduate School of Engineering,
Mie University,
Kurimamachiya-cho, 1577,
Tsu-shi 514-8507, Mie, Japan
e-mail: shako@mach.mie-u.ac.jp

Yusuke Matsumoto

Graduate School of Engineering,
Mie University,
Kurimamachiya-cho, 1577,
Tsu-shi 514-8507, Mie, Japan
e-mail: matsu-ys@ees.mach.mie-u.ac.jp

Koichi Tsujimoto

Professor
Graduate School of Engineering,
Mie University,
Kurimamachiya-cho, 1577,
Tsu-shi 514-8507, Mie, Japan
e-mail: tujimoto@mach.mie-u.ac.jp

Toshitake Ando

Graduate School of Engineering,
Mie University,
Kurimamachiya-cho, 1577,
Tsu-shi 514-8507, Mie, Japan
e-mail: ando@mach.mie-u.ac.jp

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received April 11, 2018; final manuscript received July 27, 2018; published online October 15, 2018. Assoc. Editor: Amir Jokar.

J. Thermal Sci. Eng. Appl 11(1), 011011 (Oct 15, 2018) (7 pages) Paper No: TSEA-18-1185; doi: 10.1115/1.4041347 History: Received April 11, 2018; Revised July 27, 2018

Heat exchangers are used widely in many fields, and various kinds of exchanger have been developed according to the requirement of the practical applications. Recently, heat exchangers that are highly efficient or compact have become more desirable from the viewpoint of energy conservation, and several new types have been developed, such as a compact fin tube type and a double tube type having an inner pipe with a special geometry. In this study, the flow and heat transfer characteristics of a petal-shaped double tube with a large wetted perimeter of six and five petals and five shallow petals and the effect of tube shape on the heat transfer and heat transfer efficiency were examined experimentally. The heat transfer of the double tube with a petal-shaped inner tube was increased because of the large wetted perimeter, but the pressure loss by friction increased. The optimal shape of the petal-shaped double tube with a high heat transfer performance and the greatest efficiency is discussed.

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References

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Figures

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Fig. 1

Schematic diagram of petal-shaped double tube

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Fig. 2

(a) 6P-tube, (b) 5P-tube, (c) 5P'-tube, and (d) CP-tube cross section of petal-shaped double tube

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Fig. 3

Petal shaped nozzle, for velocity distribution measurement

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Fig. 4

Mean and fluctuating velocity distributions at x = 2.0 mm (Working fluid: air, um = 25 m/s, Rein,h=1.2 × 104): (a) u/um, 6P-tube; (b) u'/um, 6P-tube; (c) u/um, 5P-tube; (d) u'/um, 5P-tube; (e) u/um, 5P' -tube; and (f) u' /um, 5P'-tube

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Fig. 5

Position of thermo-couples (5P-tube): (a) inner tube, (b) outer tube, and (c) thermocouple

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Fig. 6

Experimental apparatus for bulk temperature measurement

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Fig. 8

Pressure loss, ΔP, of double tube: (a) inner tube and (b) outer tube

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Fig. 9

Heat transfer, Q, and Reynolds number, Rein,h

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Fig. 10

Heat transfer, Q, and mean velocity, um

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Fig. 11

Effect of Vout on heat transfer, Q

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Fig. 12

Mean Nusselt number, Nuin,h

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Fig. 13

Heat transfer efficiency, η = Q/VΔP ((W/m)/(m3/s)(Pa))

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Fig. 14

Heat transfer efficiency, ηp = (Q/VΔP)/(Q/VΔP)CP

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Fig. 15

Heat transfer, Q, and heat transfer efficiency, ηP

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