0

Full Content is available to subscribers

Subscribe/Learn More  >

Experimental Conditions for Minimum Critical Reynolds Number in Pipe Flow

[+] Author Affiliations
Hidesada Kanda, Takayuki Yanagiya

University of Aizu

Paper No. IMECE2005-80637, pp. 87-96; 10 pages
doi:10.1115/IMECE2005-80637
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Fluids Engineering
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-4219-3 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

From the results of many experiments carried out in the past, it is clear that the transition between laminar and turbulent flows occurs in the entrance region, and that the critical Reynolds number (Rc) is governed by the shape of the bellmouth entrance. To date, it has not been considered how a bellmouth-shaped entrance affects the flow in pipes. If it governs the transition, the turbulence can be controlled. These findings are verified by reproducing Reynolds color-dye experiments, in particular, varying the ratio of the bellmouth diameter to pipe diameter (BD/D). CASE I through IV are devised for natural disturbance conditions. We found that (i) there were two types of Rc, namely, Rc1 for the laminar to turbulent flow transition and Rc2 for the turbulent to laminar flow transition, (ii) each bellmouth-shaped entrance had a minimum value, Rc2(min, ent), which increased as BD/D increased, and (iii) when using a straight pipe, the Rc value of 2050 was obtained as a minimum value in CASE II and IV, and the Rc2(min) value was approximately 1750 in CASE III.

Copyright © 2005 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