Turbulence measurements for both momentum and heat transfer are taken in a lowvelocity, turbulent boundary layer growing naturally over a concave wall. The experiments are conducted with negligible streamwise acceleration and a nominal freestream turbulence intensity of ∼8 percent. Comparisons are made with data taken in an earlier study in the same test facility but with a 0.6 percent free-stream turbulence intensity. Results show that elevated free-stream turbulence intensity enhances turbulence transport quantities like uv and vt in most of the boundary layer. In contrast to the low-turbulence cases, high levels of transport of momentum are measured outside the boundary layer. Stable, Go¨rtlerlike vortices, present in the flow under low-turbulence conditions, do not form when the free-stream turbulence intensity is elevated. Turbulent Prandtl numbers, Prt, within the log region of the boundary layer over the concave wall increase with streamwise distance to values as high as 1.2. Profiles of Prt suggest that the increase in momentum transport with increased free-stream turbulence intensity precedes the increase in heat transport. Distributions of near-wall mixing length for momentum remain unchanged on the concave wall when free-stream turbulence intensity is elevated. Both for this level of free-stream turbulence and for the lower level, mixing length distributions increase linearly with distance from the wall, following the standard slope. However, when free-stream turbulence intensity is elevated, this linear region extends farther into the boundary layer, indicating the emerging importance of larger eddies in the wake of the boundary layer with the high-turbulence free stream. Because these eddies are damped by the wall, the influence of the wall grows with eddy size.

1.
Barlow
S. R.
, and
Johnston
J. P.
,
1988
, “
Structure of a Turbulent Boundary Layer on a Concave Surface
,”
J. Fluid Mech.
, Vol.
191
, pp.
137
176
.
2.
Blair
M. F.
,
1983
, “
Influence of Free-Stream Turbulence on Turbulent Boundary Layer Heat Transfer and Mean Profile Development, Part II—Analysis of Results
,”
ASME Journal of Heat Transfer
, Vol.
105
, pp.
41
47
.
3.
Brown, A., and Burton, R. C., 1977, “The Effects of Free-Stream Turbulence Intensity and Velocity Distribution on Heat Transfer to Curved Surfaces,” ASME Paper No. 77-GT-48.
4.
Champagne
F. H.
,
Sleicher
C. A.
, and
Wehrmann
O. H.
,
1967
, “
Turbulence Measurements With Inclined Hot-Wires, Parts 1 and 2
,”
J. Fluid Mech.
, Vol.
28
, pp.
153
182
.
5.
Eckert
E. R. G.
,
1987
, “
Cross Transport of Energy in Fluid Streams
,”
Wa¨rmeund Stoffu¨bertragung
, Vol.
21
, pp.
73
81
.
6.
Go¨rtler, H., 1940, “Uber ein Dreidimensionale Instabilitat Laminarer Grenzschichten an Konkaven Wanden,” Math.-Phys., K1.2:1; also NACA TM-1375, 1954.
7.
Hancock
P. E.
, and
Bradshaw
P.
,
1983
, “
The Effect of Free-Stream Turbulence on Turbulent Boundary Layers
,”
Transactions of the ASME
, Vol.
105
, pp.
284
289
.
8.
Hancock
P. E.
, and
Bradshaw
P.
,
1989
, “
Turbulence Structure of a Boundary Layer Beneath a Turbulent Free-Stream
,”
J. Fluid Mech.
, Vol.
205
, pp.
45
76
.
9.
Hishida
H.
, and
Nagano
Y.
,
1978
, “
Simultaneous Measurements of Velocity and Temperature in Nonisothermal Flows
,”
ASME Journal of Heat Transfer
, Vol.
100
, No.
2
, pp.
340
345
.
10.
Hoffmann
P. H.
,
Muck
K. C. B.
, and
Bradshaw
P.
,
1985
, “
The Effect of Concave Curvature on Turbulent Boundary Layers
,”
J. Fluid Mech.
, Vol.
161
, pp.
371
403
.
11.
Hunt
J. C. R.
, and
Graham
J. M. R.
,
1978
, “
Free-Stream Turbulence Near Plane Boundaries
,”
J. Fluid Mech.
, Vol.
84
, pp.
209
235
.
12.
Kestoras
M. D.
, and
Simon
T. W.
,
1992
, “
Hydrodynamic and Thermal Measurements in a Turbulent Boundary Layer Recovering From Concave Curvature
,”
ASME Journal of Turbomachinery
, Vol.
114
, pp.
891
898
.
13.
Kestoras, M. D., 1993, “Heat Transfer and Fluid Mechanics Measurements in a Turbulent Boundary Layer: Introduction and Removal of Concave Curvature Under High Free-Stream Turbulence Conditions,” Ph.D. Thesis, Dept. of Mech. Engrg., University of Minnesota.
14.
Kestoras, M. D., and Simon, T. W., 1993, “Combined Effects of Concave Curvature and High Free-Stream Turbulence Intensity on Boundary Layer Heat and Momentum Transport,” ASME Paper No. 93-WA/HT-56.
15.
Kim, J., 1986, “The Development of a Turbulent Heat Flux Probe and Its Use in a 2-D Boundary Layer Over a Convex Surface,” MSME Thesis, Dept. of Mech. Engrg., University of Minnesota.
16.
Kim
J.
, and
Simon
T. W.
,
1988
, “
Measurements of the Turbulent Transport of Heat and Momentum in Convexly Curved Boundary Layers: Effects of Curvature, Recovery and Free-Stream Turbulence
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
110
, No.
1
, pp.
80
87
.
17.
Kim
J.
,
Simon
T. W.
, and
Russ
S. G.
,
1992
, “
Free-Stream Turbulence and Concave Curvature Effects on Heated, Transitional Boundary Layers
,”
ASME Journal of Heat Transfer
, Vol.
114
, pp.
339
347
.
18.
Nakano, S., Takahashi, A., Shizawa, T., and Honami, S., 1981, “Effects of Stable and Unstable Free-Streams on a Turbulent Flow Over a Concave Surface,” Proc. 3rd Symposium on Turbulent Shear Flows, Davis, CA.
19.
O’Brien, J. E., and vanFossen, G. J., 1985, “The Influence of Jet Grid Turbulence on Heat Transfer From the Stagnation Region of a Cylinder in Cross Flow,” ASME Paper No. 85-HT-58.
20.
Ramaprian
B. R.
, and
Shivaprasad
B. G.
,
1977
, “
Mean Flow Measurements in Turbulent Boundary Layers Along Mildly Curved Surfaces
,”
AIAA J.
, Vol.
15
, No.
2
, pp.
189
196
.
21.
Ramaprian
B. R.
, and
Shivaprasad
B. G.
,
1978
, “
The Structure of Turbulent Boundary Layers Along Mildly Curved Surfaces
,”
J. Fluid Mechanics
, Vol.
85
, part 2, pp.
273
303
.
22.
Shizawa, T., and Honami, S., 1985, “Experiments on a Turbulent Boundary Layers Over a Concave Surface—Response of Turbulence to Curvature,” presented at the 5th Symposium on Turbulent Shear Flows, Ithaca, Aug.
23.
So
R. M.
, and
Mellor
G. L.
,
1975
, “
Experiment on Turbulent Boundary Layers on a Concave Wall
,”
The Aeronautical Quarterly
, Vol.
26
, pp.
25
40
.
24.
Tani
I.
,
1962
, “
Production of Longitudinal Vortices in the Boundary Layer Along a Concave Wall
,”
J. of Geophysical Research
, Vol.
67
, p.
3075
3075
.
25.
Thomas
N. H.
, and
Hancock
P. E.
,
1977
, “
Grid Turbulence Near a Moving Wall
,”
J. Fluid Mech.
, Vol.
82
, pp.
481
496
.
26.
Wang, T., 1984, “An Experimental Investigation of Curvature and Freestream Turbulence Effects on Heat Transfer and Fluid Mechanics in Transition Boundary Layer Flows,” Ph.D. Thesis, University of Minnesota.
27.
Yavuzkurt
S.
,
1984
, “
A Guide to Uncertainty Analysis of Hot-Wire Data
,”
ASME Journal of Fluids Engineering
, Vol.
106
, pp.
181
186
.
28.
You, S. M., Simon, T. W., and Kim, J., 1986, “Boundary Layer Heat Transfer and Fluid Mechanics Measurements on a Mildly-Curved Convex Wall,” Proc. 8th Int. Heat Transfer Conf., Vol. 3, pp. 1089–1094.
This content is only available via PDF.
You do not currently have access to this content.