0

Full Content is available to subscribers

Subscribe/Learn More  >

Evaluation of Mass Transfer Coefficient Under Swirl Flow Generated by the Combination of Pipe Elements: Part 2

[+] Author Affiliations
Kei Yamamoto, Shota Suzuki, Takao Nakamura

Osaka University, Suita, Osaka, Japan

Paper No. PVP2013-97657, pp. V005T11A021; 8 pages
doi:10.1115/PVP2013-97657
From:
  • ASME 2013 Pressure Vessels and Piping Conference
  • Volume 5: High-Pressure Technology; ASME NDE Division; Rudy Scavuzzo Student Paper Symposium
  • Paris, France, July 14–18, 2013
  • Conference Sponsors: Pressure Vessels and Piping Division, Nondestructive Evaluation Engineering Division
  • ISBN: 978-0-7918-5569-0
  • Copyright © 2013 by ASME

abstract

Flow accelerated corrosion (FAC) is a major pipe wall thinning phenomena in power plants. The management of pipe wall thinning has been carried out to pipe elements such as elbow, orifice, etc. of the piping system in power plants. The combination of analytical codes and measurement of pipe wall thinning is usually applied to thinning estimation methods. In piping system, several pipe elements which are connected in series may generate swirl flow. Therefore the arrangement of pipe elements is considered to affect thinning phenomena seriously. So the behavior of swirl flow is one of the major research targets to improve the accuracy of simulation codes. In Mihama Unit 3 pipe degradation accident in 2004, it was pointed out that the swirl flow caused by the piping layout might influence thinning rate behind orifice.

In the article Part1, we focus on the conditions and parameters (combination, distance, etc. of pipe elements) that affect the generation of swirl flow and analyze the effect of such parameters in mass transfer coefficient behind pipe elements. The generation of swirl flow is confirmed analytically in this study.

In the article part2, we develop new defined effective friction velocity considering the ratio between the change of average flow velocity and the change of turbulent velocity in the straight pipe. The effect of swirl flow on geometry factor is also evaluated by the new defined effective friction velocity. We also focus on the flow field of main-stream in the swirl flow. The result of analysis shows the generation of twin vortex under some combinations of pipe elements and suggests that twin vortex may affect the distribution of geometry factor. We compare the analytical results and estimate the cause of Mihama Unit 3 pipe degradation accident. The results of this study will be reflected to the evaluation of fluid-dynamic factor of FAC and improve the accuracy of simulation codes in near future.

Copyright © 2013 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

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 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