0
Research Papers: Evaporation, Boiling, and Condensation

An Experimental Study on Flow Boiling Heat Transfer From a Downward-Facing Finned Surface and Its Effect on Critical Heat Flux

[+] Author and Article Information
A. R. Khan

Department of Nuclear Engineering
and Management,
School of Engineering,
The University of Tokyo,
7-3-1 Hongo,
Bunkyo-ku 113-8654, Tokyo, Japan
e-mail: ark8@njit.edu

N. Erkan

Nuclear Professional School,
School of Engineering,
The University of Tokyo,
2-22 Shirakata,
Tokai-mura 319-1188, Ibaraki, Japan
e-mail: erkan@vis.t.u-tokyo.ac.jp

K. Okamoto

Nuclear Professional School,
School of Engineering,
The University of Tokyo,
2-22 Shirakata, Tokai-mura 319-1188, Ibaraki, Japan
e-mail: okamoto@n.t.u-tokyo.ac.jp

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 26, 2016; final manuscript received June 15, 2017; published online August 29, 2017. Assoc. Editor: Amitabh Narain.

J. Heat Transfer 140(2), 021501 (Aug 29, 2017) (10 pages) Paper No: HT-16-1608; doi: 10.1115/1.4037154 History: Received September 26, 2016; Revised June 15, 2017

During a severe accident, ex-vessel cooling may pose a risk for larger-powered reactors. The current in-vessel retention (IVR) (through ex-vessel cooling) capability may not be sufficient for the larger-powered reactors, and critical heat flux (CHF) conditions may eventually lead to vessel failure. A manner in which the CHF can be increased is by applying a structured surface design on the outer surface of the reactor pressure vessel (RPV). A simple design proposed in this work is the pin–fin. An experimental investigation was performed to observe the effect of the pin–fin on CHF with a downward-facing heated surface in flow boiling conditions. A reduced pressure of approximately 0.05 MPa allowed for saturation at approximately 81 °C. A range of flow rates corresponding to mass flux of 202–1456 kg/m2 s were applied in the experiments. The results showed an increase in the CHF when compared to a bare surface. An average CHF enhancement of 61% was observed from the finned surface. An enhancement of approximately 19% was observed in the heat transfer coefficient. As seen in nanoparticle/nanofluid enhancement, an increase in the CHF also leads to an increase in the superheat. Even though an increase in the CHF had been observed, the CHF for the finned and bare surfaces occurred at approximately similar superheat.

Copyright © 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Dinh, T.-N. , Tu, J. P. , Salmassi, T. , and Theofanous, T. G. , 2003, “ Limits of Coolability in the AP1000-Related ULPU-2400 Configuration V Facility,” University of California, Goleta, CA, Report No. CRSS-03/06. https://www.nrc.gov/docs/ML0319/ML031920123.pdf
Haley, K. W. , and Westwater, J. W. , 1965, “ Heat Transfer From a Fin to a Boiling Liquid,” Chem. Eng. Sci., 20(7), pp. 711–712. [CrossRef]
Liaw, S. P. , and Yeh, R. H. , 1994, “ Fins With Temperature Dependent Surface Heat Flux—II: Multi-Boiling Heat Transfer,” Int. J. Heat Mass Transfer, 37(10), pp. 1517–1524. [CrossRef]
Guglielmini, G. , Misale, M. , and Schenone, C. , 1996, “ Experiments on Pool Boiling of a Dielectric Fluid on Extended Surfaces,” Int. Commun. Heat Mass Transfer, 23(4), pp. 451–462. [CrossRef]
Yu, C. K. , and Lu, D. C. , 2007, “ Pool Boiling Heat Transfer on Horizontal Rectangular Fin Array in Saturated FC-72,” Int. J. Heat Mass Transfer, 50(17–18), pp. 3624–3637. [CrossRef]
Chan, M. A. , Yap, C. R. , and Ng, K. C. , 2010, “ Pool Boiling Heat Transfer of Water on Finned Surfaces at Near Vacuum Pressures,” ASME J. Heat Transfer, 132(3), p. 031501. [CrossRef]
El-Genk, M. S. , and Guo, Z. , 1993, “ Transient Boiling Form Inclined and Downward-Facing Surfaces in a Saturated Pool,” Int. J. Refrig., 16(3), pp. 414–422. [CrossRef]
Yang, S. H. , Baek, W. , and Chang, S. H. , 1997, “ Poo-Boiling Critical Heat Flux of Water on Small Plates: Effects of Surface Orientation and Size,” Int. Commun. Heat Mass Transfer, 24(8), pp. 1093–1102. [CrossRef]
Noh, S. W. , and Suh, K. Y. , 2014, “ Critical Heat Flux in Various Inclined Rectangular Straight Surface Channels,” Exp. Therm. Fluid Sci., 52, pp. 1–11. [CrossRef]
Theofanous, T. G. , and Syri, S. , 1997, “ The Coolability Limits of a Reactor Pressure Vessel Lower Head,” Nucl. Eng. Des., 169(1–3), pp. 59–76. [CrossRef]
Cheung, F. B. , Haddad, K. H. , and Liu, Y. C. , 1997, “ Critical Heat Flux (CHF) Phenomenon on a Downward Facing Curved Surface,” U.S. Nuclear Regulatory Commission, Rockville, MD, Report No. NUREG/CR-6507. https://www.osti.gov/scitech/servlets/purl/491560
Yang, J. , Dizon, M. B. , Cheung, F. B. , Rempe, J. L. , Suh, K. Y. , and Kim, S. B. , 2005, “ Critical Heat Flux for Downward Facing Boiling on a Coated Hemispherical Surface,” Exp. Heat Transfer, 18(4), pp. 223–242. [CrossRef]
Zhang, H. , Mudawar, I. , and Hasan, M. M. , 2002, “ Experimental Assessment of the Effects of Body Force, Surface Tension Force, and Inertia on Flow Boiling CHF,” Int. J. Heat Mass Transfer, 45(20), pp. 4079–4095. [CrossRef]
Zhang, H. , Mudawar, I. , and Hasan, M. M. , 2002, “ Experimental and Theoretical Study of Orientation Effects on Flow Boiling CHF,” Int. J. Heat Mass Transfer, 45(22), pp. 4463–4477. [CrossRef]
Moffat, R. J. , 1988, “ Describing the Uncertainties in Experimental Results,” Exp. Therm. Fluid Sci., 1(1), pp. 3–17. [CrossRef]
Khan, A. R. , Erkan, N. , and Okamoto, K. , 2015, “ Heat Transfer Effect of an Extended Surface in Downward-Facing Subcooled Flow Boiling,” Nucl. Eng. Des., 295, pp. 148–154. [CrossRef]
Katto, Y. , and Kurata, C. , 1980, “ Critical Heat Flux of Saturated Convective Boiling on Uniformly Heated Plates in Parallel Flow,” Int. J. Multiphase Flow, 6(6), pp. 575–582. [CrossRef]
Hu, X. , Lin, G. , Cai, Y. , and Wen, D. , 2011, “ Experimental Study of Flow Boiling of FC-72 in Parallel Minichannels Under Sub-Atmospheric Pressure,” Appl. Therm. Eng., 31(17–18), pp. 3839–3853. [CrossRef]
Lazarek, G. M. , and Black, S. H. , 1982, “ Evaporative Heat Transfer, Pressure Drop and Critical Heat Flux in a Small Vertical Tube With R-113,” Int. J. Heat Mass Transfer, 25(7), pp. 945–960. [CrossRef]
Tran, T. N. , Wambsganss, M. W. , and France, D. M. , 1996, “ Small Circular-and Rectangular-Channel Boiling With Two Refrigerants,” Int. J. Multiphase Flow, 22(3), pp. 485–498. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

Experimental facility used to study reduced pressure flow boiling

Grahic Jump Location
Fig. 2

Midsection schematic of the finned surface test section

Grahic Jump Location
Fig. 4

Heat flux versus wall superheat for B-1 and F-1 (1456 kg/m2 s)

Grahic Jump Location
Fig. 5

Heat flux versus wall superheat for B-2 and F-2 (1295 kg/m2 s)

Grahic Jump Location
Fig. 6

Heat flux versus wall superheat for B-3 and F-3 (1133 kg/m2 s)

Grahic Jump Location
Fig. 7

Heat flux versus wall superheat for B-4 and F-4 (971 kg/m2 s)

Grahic Jump Location
Fig. 8

Heat flux versus wall superheat B-5 and F-5 (647 kg/m2 s)

Grahic Jump Location
Fig. 3

Examples of increasing temperatures during CHF: (a) 647 kg/m s2 bare surface, (b) 647 kg/m s2 fin surface, (c) 971 kg/m s2 bare surface, (d) 971 kg/m s2 fin surface, (e) 1456 kg/m s2 bare surface, and (f) 1456 kg/m s2 fin surface

Grahic Jump Location
Fig. 9

Heat flux versus wall superheat B-6 and F-6 (324 kg/m2 s)

Grahic Jump Location
Fig. 10

Heat flux versus wall superheat for B-7 and F-7 (202 kg/m2 s)

Grahic Jump Location
Fig. 11

Bare and finned surface CHF data for all flow rates

Grahic Jump Location
Fig. 12

(a) Steady-state pre-CHF bare surface boiling images: (a) 202 kg/m s2, (b) 324 kg/m s2, (c) 647 kg/m s2, (d) 971 kg/m s2, (e) 1133 kg/m s2, (f) 1295 kg/m s2, and (g) 1456 kg/m s2. (b) Steady-state pre-CHF finned surface boiling images: (a) 202 kg/m s2, (b) 324 kg/m s2, (c) 647 kg/m s2, (d) 971 kg/m s2, (e) 1133 kg/m s2, (f) 1295 kg/m s2, and (g) 1456 kg/m s2.

Grahic Jump Location
Fig. 13

Comparison of Katto and Kurata correlation with bare surface data

Grahic Jump Location
Fig. 14

Comparison of original and modified correlations with bare surface data

Grahic Jump Location
Fig. 15

Comparison of modified Katto and Kurata correlation with finned surface data

Grahic Jump Location
Fig. 17

Heat transfer coefficients for both surfaces compared with the modified correlations

Grahic Jump Location
Fig. 18

Illustration of boiling curve shift causing heat transfer and CHF enhancement

Grahic Jump Location
Fig. 19

Superheat at CHF (ΔTSAT,CHF) for bare and finned surfaces

Grahic Jump Location
Fig. 16

Comparison of the modified correlations and experimental data

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In