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Technical Brief

Visualization Study of Steam Condensation in Rectangular Channel of Multichannel Cylinder Dryer

[+] Author and Article Information
Yan Yan

College of Mechanical and Electrical Engineering,
Shaanxi University of Science and Technology,
Xi'an, Shaanxi 710021, China
e-mail: yy8923507@163.com

Dong Jixian

College of Mechanical and Electrical Engineering,
Shaanxi University of Science and Technology,
Xi'an, Shaanxi 710021, China
e-mail: 175235610@qq.com

Tang Wei

College of Mechanical and Electrical Engineering,
Shaanxi University of Science and Technology,
Xi'an, Shaanxi 710021, China
e-mail: 1725125274@qq.com

Feng Shiyu

College of Aerospace Engineering,
Nanjing University of Aeronautics and Astronautics,
Nanjing, Jiangsu 210016, China
e-mail: shiyuf@nuaa.edu.cn

1Corresponding author.

Presented at the 2016 ASME 5th Micro/Nanoscale Heat and Mass Transfer International Conference. Paper No. MNHMT2016-6693.Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 19, 2016; final manuscript received December 19, 2016; published online February 14, 2017. Assoc. Editor: Zhuomin Zhang.

J. Heat Transfer 139(5), 054503 (Feb 14, 2017) (5 pages) Paper No: HT-16-1404; doi: 10.1115/1.4035590 History: Received June 19, 2016; Revised December 19, 2016

The phenomenon of steam condensation occurring on one surface in a rectangular horizontal channel was experimentally studied. The experiment was conducted using a visualization method with a steam quality of 0.1–0.9 and mass flux of 20–50 kg/m2 s. Four flow patterns (annular, wave, slug, and plug) were observed, and the effects of quality and mass flux on the condensing heat transfer were analyzed. The mass flux and steam quality primarily affect the condensing heat transfer coefficient in the shear-dominated flow regime. The condensing heat transfer coefficients are nearly constant only in a certain range of steam quality. This result is disparate from what has been reported in previous literatures. It was also observed that the condensing heat transfer coefficient rises with an increase in the quality. Two flow regime maps were employed to predict the flow regimes observed in this study. The result reveals that the Tandon flow regime map agrees quite well with the experimental results.

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Figures

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Fig. 1

Schematic diagram of the experimental apparatus

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Fig. 2

Schematic diagram of the test section: (a) The cross section of the test section and (b) details of the test section

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Fig. 3

Images of flow regimes of one-sided steam condensation in a horizontal rectangular channel

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Fig. 4

Experimental data in the flow regime map of Mandhane et al.

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Fig. 5

Experimental data in flow regime map of Tandon

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Fig. 6

Variation of condensing heat transfer coefficient with steam quality under various mass fluxes

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Fig. 7

Local average condensing heat transfer coefficient versus mass flux at various vapor qualities

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