Drag of a turbulent boundary layer with transverse 2D circular rods on the wall

Drag of a turbulent boundary layer with transverse 2D circular rods on the wall In this paper, we present the results of a turbulent boundary layer developing over a rod-roughened wall with a spacing of $$\lambda /k = 8$$ λ / k = 8 ( $$\lambda$$ λ is the spacing between two adjacent roughness elements, and $$k$$ k is the rod diameter). Static pressure measurements are taken around a single roughness element to accurately determine the friction velocity, $$U_\tau$$ U τ and the error in the origin, $$d_0$$ d 0 , which are the two prominent issues that surround rough-wall boundary layers. In addition, velocity measurements are taken at several streamwise locations using hot-wire anemometry to obtain $$C_\mathrm{f}$$ C f from the momentum integral equation. Results showed that both methods give consistent values for $$U_\tau$$ U τ , indicating that the contribution of the viscous drag over this rough wall is negligible. This supports the results of Perry et al. (J Fluid Mech 177:437–466, 1969) and Antonia and Luxton (J Fluid Mech 48(04):721–761, 1971) in a boundary layer and of Leonardi et al. (2003) in a channel flow but does not agree with those of Furuya et al. (J Fluids Eng 98(4):635–643, 1976). The results show that both $$U_{\tau }$$ U τ and $$d_0$$ d 0 can be unambiguously measured on this particular rough wall. This paves the way for a proper comparison between the boundary layer developing over this wall and the smooth-wall turbulent boundary layer. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Drag of a turbulent boundary layer with transverse 2D circular rods on the wall

Loading next page...
 
/lp/springer_journal/drag-of-a-turbulent-boundary-layer-with-transverse-2d-circular-rods-on-OspPD3d8x0
Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2015 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-015-1995-6
Publisher site
See Article on Publisher Site

Abstract

In this paper, we present the results of a turbulent boundary layer developing over a rod-roughened wall with a spacing of $$\lambda /k = 8$$ λ / k = 8 ( $$\lambda$$ λ is the spacing between two adjacent roughness elements, and $$k$$ k is the rod diameter). Static pressure measurements are taken around a single roughness element to accurately determine the friction velocity, $$U_\tau$$ U τ and the error in the origin, $$d_0$$ d 0 , which are the two prominent issues that surround rough-wall boundary layers. In addition, velocity measurements are taken at several streamwise locations using hot-wire anemometry to obtain $$C_\mathrm{f}$$ C f from the momentum integral equation. Results showed that both methods give consistent values for $$U_\tau$$ U τ , indicating that the contribution of the viscous drag over this rough wall is negligible. This supports the results of Perry et al. (J Fluid Mech 177:437–466, 1969) and Antonia and Luxton (J Fluid Mech 48(04):721–761, 1971) in a boundary layer and of Leonardi et al. (2003) in a channel flow but does not agree with those of Furuya et al. (J Fluids Eng 98(4):635–643, 1976). The results show that both $$U_{\tau }$$ U τ and $$d_0$$ d 0 can be unambiguously measured on this particular rough wall. This paves the way for a proper comparison between the boundary layer developing over this wall and the smooth-wall turbulent boundary layer.

Journal

Experiments in FluidsSpringer Journals

Published: Jun 3, 2015

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off