0
RESEARCH PAPERS

The Calibration of Preston Tubes in Transpired Turbulent Boundary Layers

[+] Author and Article Information
K. Depooter, E. Brundrett, A. B. Strong

Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada

J. Fluids Eng 100(1), 10-15 (Mar 01, 1978) (6 pages) doi:10.1115/1.3448581 History: Received August 05, 1977; Online October 12, 2010

Abstract

The Preston tube calibration of Patel is reproduced for zero pressure gradient and zero mass transfer turbulent flows, by momentum balance and by direct measurement using a floating element with mass transfer capability. The calibration is then extended to blowing and suction conditions, from near blow-off through to relaminarization. The effects of mass transfer are found to be moderate until conditions are encountered approaching relaminarization or blow-off. Transpiration effects are adequately correlated by a transpiration parameter proposed by Baker et al. As either the blow-off or suction relaminarization condition is approached, it is recommended that three or more sizes of Preston tubes be used which satisfy Patel’s middle range criterion. As suction relaminarization is approached the smallest tubes will show progressively greater departure from the wall similarity correlation. If a unique value of shear stress is obtained yet from the larger tubes it is valid. A similar test for consistency is recommended for conditions near blow-off. The study is extended to a boundary layer fence, which shows no significant mass transfer effect upon the zero transpiration calibration.

Copyright © 1978 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

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