Research Papers

Heat Transfer and Friction Measurement in Pin-Fin Arrays Under Mist Flow Condition

[+] Author and Article Information
Szu-Kai Wang

Department of Mechanical Engineering,
National Chiao Tung University,
Hsinchu 30010, Taiwan, China
e-mail: xc198891@yahoo.com.tw

Yao-Hsien Liu

Department of Mechanical Engineering,
National Chiao Tung University,
Hsinchu 30010, Taiwan, China
e-mail: yhliu@mail.nctu.edu.tw

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received March 1, 2018; final manuscript received September 25, 2018; published online December 5, 2018. Assoc. Editor: Ayyoub M. Momen.

J. Thermal Sci. Eng. Appl 11(2), 021012 (Dec 05, 2018) (10 pages) Paper No: TSEA-18-1112; doi: 10.1115/1.4041635 History: Received March 01, 2018; Revised September 25, 2018

Effects of air/water mist flow on endwall heat transfer in a square channel were experimentally investigated using infrared thermography. The purpose was to study the detailed heat transfer contour variation caused by the generation of the liquid films. The surface was roughened with staggered partial pin-fin arrays to enhance flow mixing and liquid entrainment. Two streamwise spacings (Xp/d = 3 and 6) of the fin array were investigated. The gas Reynolds number ranged from 7900 to 24,000. The calculated droplet deposition velocity was comparable to the literature results and was not substantially affected by the gas Reynolds number or fin spacing. For the pin-fin array, heat transfer was dominated by the water accumulation and liquid film formation, which was dependent on the carrier gas flow rate and fin spacing. Furthermore, thick liquid fragments entrained between the fins substantially enhanced local convective heat transfer coefficients. The average heat transfer enhancement on the finned surfaces using mist flow was four times as high as the air flow. The pressure drop from the mist flow was two times as high as the air flow.

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Fig. 1

Schematic diagram of the experimental setup

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Fig. 2

Drawing of the test channel

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Fig. 3

Configuration of the pin-fin array (Xp/d = 6)

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Fig. 4

Calibration of infrared camera

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Fig. 5

Thermal resistance model

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Fig. 6

Heat loss measurement

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Fig. 7

Nusselt number distribution for the air flow

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Fig. 8

(a) Conceptual view of the mist flow and (b) the images of the liquid fragments

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Fig. 9

The droplet deposition velocity with the relaxation time

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Fig. 10

Nusselt number distribution for mist flow

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Fig. 11

Enhancement ratio of mist flow cooling

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Fig. 12

Spanwise-averaged Nusselt number

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Fig. 13

Overall-averaged Nusselt number

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Fig. 14

Overall enhancement ratio of air/water mist flow over air only flow

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Fig. 15

Friction factor measurement



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