Measuring Unsteady Velocity Profiles and Integral Parameters Using Digital Image Processing of Hydrogen Bubble Timelines

[+] Author and Article Information
S. D. Bruneau, W. R. Pauley

Department of Aerospace Engineering, The Pennsylvania State University, University Park, PA 16802

J. Fluids Eng 117(3), 331-340 (Sep 01, 1995) (10 pages) doi:10.1115/1.2817266 History: Received June 17, 1993; Revised April 25, 1995; Online December 04, 2007


To aid in the investigation of artificially generated turbulent spots a technique was developed to make instantaneous measurements of full velocity profiles in an unsteady water boundary layer. These profiles were used to document the unsteady behavior of scalar descriptors such as the displacement thickness. The classical hydrogen bubble flow visualization technique was augmented to yield quantitative information by incorporating digital image processing of videotaped boundary layer flow. Digital images were converted into velocity fields using a corrected time-of-flight technique. The capability and limitations of this method in both steady and unsteady flows have been verified using an analytical uncertainty analysis and through comparison with laser-Doppler anemometry measurements. Recommendations are made for effective use of this technique.

Copyright © 1995 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.





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