Research Papers: Evaporation, Boiling, and Condensation

Angular Dependency on Film Boiling Heat Transfer From Relatively Long Inclined Flat Plates

[+] Author and Article Information
Kune Y. Suh

e-mail: kysuh@snu.ac.kr
Department of Nuclear Engineering,
Seoul National University,
599 Gwanak-ro, Gwanak-gu,
Seoul 151-744, Korea

1Present address: Nuclear Hydrogen Production Reactor Technology Development Division, Korea Atomic Energy Research Institute, Daedeok-daero 989-111, Yuseong-gu, Daejeon 305-353, Korea.

2Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 23, 2012; final manuscript received May 10, 2013; published online September 27, 2013. Assoc. Editor: W. Q. Tao.

J. Heat Transfer 135(12), 121502 (Sep 27, 2013) (8 pages) Paper No: HT-12-1518; doi: 10.1115/1.4024583 History: Received September 23, 2012; Revised May 10, 2013

The effect of inclination angle of the downward facing flat plate on the interfacial wavy motion is investigated utilizing the water quenching test apparatus downward ebullient laminar transition apparatus flat surface (DELTA-FS) in a quasi-steady state. Film boiling heat transfer coefficients are obtained on the relatively long surface in the flow direction. Interfacial velocities at the various inclination angles and wall superheat conditions are determined through the analysis of the visualized continuous snapshots with 1000 fps. Visualization of the vapor film reveals that the interfacial wavelength increases and the interfacial velocity decreases as the flat plate moves from the vertical to downward facing locations. A new semi-empirical correlation is developed from the measured heat transfer coefficients and interfacial velocities. The correlation shows good agreement with the previous water test results on vertical plates. In the case of the previous other fluid experimental results on the vertical plates, the correlation overpredicts the film boiling heat transfer coefficients at the experimental condition.

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Fig. 1

Schematic diagram of laminar wavy film boiling on the inclined flat plate

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Fig. 2

Calculation process of unknown parameters considering interfacial wavy motion

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Fig. 3

Experimental apparatus

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Fig. 4

Location of thermocouples

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Fig. 5

Film boiling with inclination angles during 0.02 s

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Fig. 6

Unknown parameters for semi-empirical correlation

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Fig. 7

Film boiling heat transfer coefficients from inclined flat plates

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Fig. 8

Comparison against other experimental results with water

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Fig. 9

Comparison against experimental results with other fluids

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Fig. 10

Comparative fluid characteristics



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