An experimental study has been performed to investigate the effect of freestream vortical structures and vorticity on stagnation region heat transfer. A heat transfer model with a cylindrical leading edge was tested in a wind tunnel at Reynolds numbers ranging from 67,750 to 142,250 based on leading edge diameter of the model. Grids of parallel rods were placed at several locations upstream of the heat transfer model in orientations where the rods were perpendicular and parallel to the stagnation line to generate freestream turbulence with distinct vortical structures. All three components of turbulence intensity, integral length scale and the spanwise and transverse vorticity were measured to characterize the freestream turbulence. The measured heat transfer data and freestream turbulence characteristics were compared with existing empirical models for the stagnation line heat transfer. A new correlation for the stagnation line heat transfer has been developed that includes the spanwise fluctuating vorticity components.

1.
Smith
,
M. C.
, and
Kuethe
,
A. M.
,
1966
, “
Effects of Turbulence on Laminar Skin Friction and Heat Transfer
,”
Phys. Fluids
,
9
(
12
), pp.
2337
2344
.
2.
Kestin
,
J.
, and
Wood
,
R. T.
,
1971
, “
The Influence of Turbulence on Mass Transfer from Cylinders
,”
ASME J. Heat Transfer
,
93C
, pp.
321
327
.
3.
Lowery
,
G. W.
, and
Vachon
,
R. I.
,
1975
, “
Effect of Turbulence on Heat Transfer from Heated Cylinders
,”
Int. J. Heat Mass Transf.
,
18
(
11
), pp.
1229
1242
.
4.
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 Crossflow,” ASME Paper 85-HT-58.
5.
Mehendale
,
A. B.
,
Han
,
J. C.
, and
Ou
,
S.
,
1991
, “
Influence of High Mainstream Turbulence on Leading Edge Heat Transfer
,”
ASME J. Heat Transfer
,
113
, pp.
843
850
.
6.
Yeh, F. C., Hippensteele, S. A., VanFossen, G. J., Poinsatte, P. E., and Ameri, A. 1993, “High Reynolds Number and Turbulence Effects on Aerodynamics and Heat Transfer in a Turbine Cascade,” Paper No. AIAA-93-2252.
7.
VanFossen
,
G. J.
,
Simoneau
,
R. J.
, and
Ching
,
C. Y.
,
1995
, “
Influence of Turbulence Parameters, Reynolds Number and Body Shape on Stagnation Region Heat Transfer
,”
ASME J. Heat Transfer
,
117
, pp.
597
603
.
8.
Oo
,
A. N.
, and
Ching
,
C. Y.
,
2001
, “
Effect of Turbulence with Different Vortical Structures on Stagnation Region Heat Transfer
,”
ASME J. Heat Transfer
,
123
, pp.
665
674
.
9.
Tennekes, H., and Lumley, J. L., 1972, A First Course in Turbulence, The MIT Press, The Massachusetts Institute of Technology.
10.
Foss, J. F., and Haw, R. C., 1990, “Transverse Vorticity Measurements Using a Compact Array of Four Sensors,” The Heuristics of Thermal Anemometry, D. E. Stock, S. A. Sherif, and A. J. Smits, eds., ASME-FED 97, pp. 71–76.
11.
Antonia
,
R. A.
,
Browne
,
L. W. B.
, and
Shah
,
D. A.
,
1988
, “
Characteristics of Vorticity Fluctuation in a Turbulent Wake
,”
J. Fluid Mech.
,
189
, pp.
349
365
.
12.
Yavuzkurt
,
S.
,
1984
, “
A Guide to Uncertainty Analysis of Hot-Wire Data
,”
ASME J. Fluids Eng.
,
106
, pp.
181
186
.
13.
Zhou
,
T.
, and
Antonia
,
R. A.
,
2000
, “
Reynolds Number Dependence of the Small-Scale Structure of Grid Turbulence
,”
J. Fluid Mech.
,
406
, pp.
81
107
.
14.
Moffat
,
R. J.
,
1988
, “
Describing the Uncertainties in Experimental Results
,”
Exp. Therm. Fluid Sci.
,
1
, pp.
3
17
.
You do not currently have access to this content.