0
Research Papers

Countercurrent Flow Limitation in Slightly Inclined Pipes With Elbows

[+] Author and Article Information
Michio Murase

Mem. ASME Institute of Nuclear Safety System, Inc.,
64 Sata, Mihama-cho, Mikata-gun, Fukui 919-1205, Japan
e-mail: murase@inss.co.jp

Ikuo Kinoshita

Institute of Nuclear Safety System, Inc.,
64 Sata, Mihama-cho, Mikata-gun, Fukui 919-1205, Japan
e-mail: kinoshita@inss.co.jp

Takayoshi Kusunoki

Institute of Nuclear Safety System, Inc.,
64 Sata, Mihama-cho, Mikata-gun, Fukui 919-1205, Japan
e-mail: kusunoki.takayoshi@inss.co.jp

Dirk Lucas

Helmholtz–Zentrum Dresden–Rossendorf,
P.O. Box 510 119, Dresden 01314, Germany
e-mail: d.lucas@hzdr.de

Akio Tomiyama

Kobe University,
1-1 Rokkodai, Nada-ku, Kobe-shi, Hyogo 657-8501, Japan
e-mail: tomiyama@mech.kobe-u.ac.jp

1Corresponding author.

Manuscript received February 17, 2015; final manuscript received July 5, 2015; published online September 3, 2015. Assoc. Editor: Mark Anderson.

ASME J of Nuclear Rad Sci 1(4), 041009 (Sep 03, 2015) (9 pages) Paper No: NERS-15-1019; doi: 10.1115/1.4031032 History: Received February 17, 2015; Accepted July 07, 2015; Online September 16, 2015

One-dimensional (1D) sensitivity computations were carried out for air–water countercurrent flows in a 1/15-scale model of the hot leg and a 1/10-scale model of the pressurizer surge line in a pressurized water reactor (PWR) to generalize the prediction method for countercurrent flow limitation (CCFL) characteristics in slightly inclined pipes with elbows. In the 1D model, the wall friction coefficient fwG of single-phase gas flows was used. The interfacial drag coefficient of fi=0.03, an appropriate adjustment factor of NwL=6 for the wall friction coefficient fwL of single-phase liquid flows (NwG=1 for fwG of single-phase gas flows), and an appropriate adjustment factor of Nde=6 for the pressure loss coefficient ζe of elbows in single-phase flows were determined to give good agreement between the computed and measured CCFL characteristics. The adjusted factors were used to compute and then discuss effects of the inclination angle and diameter on CCFL characteristics.

FIGURES IN THIS ARTICLE
<>
Copyright © 2015 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Experimental setups for the 1/10-scale model of the pressurizer surge line [11]

Grahic Jump Location
Fig. 2

CCFL characteristics in the 1/10-scale model with elbows [11]

Grahic Jump Location
Fig. 3

Flow patterns in the 1/10-scale model with elbows [11]

Grahic Jump Location
Fig. 4

Model for CCFL in an inclined pipe

Grahic Jump Location
Fig. 5

CCFL characteristics in hot leg models (L/D=8.6–9.0)

Grahic Jump Location
Fig. 6

CCFL characteristics in straight pipes without elbows (L/D=63)

Grahic Jump Location
Fig. 7

CCFL characteristics in the 1/10-scale model of the pressurizer surge line with elbows (L/D=63)

Grahic Jump Location
Fig. 8

Effects of inclination angle on CCFL characteristics (Case 3)

Grahic Jump Location
Fig. 9

Effects of diameter on CCFL characteristics computed for Case 3

Grahic Jump Location
Fig. 10

Example of measured water velocity fields in a rectangular channel with 150 mm height and 10 mm width

Grahic Jump Location
Fig. 11

CCFL characteristics and water levels in the 1/15-scale model of the hot leg

Grahic Jump Location
Fig. 12

CCFL characteristics in the 1/10-scale model of the pressurizer surge line

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