If a steady thermal boundary layer is sufficiently thick, wall heat fluxes and associated convective heat transfer coefficients can be directly calculated from measured temperature distributions taken within it using a traversing thermocouple probe. The boundary layer can be laminar, turbulent, or transitional and on a surface of arbitrary surface temperature distribution and geometry. Herein, this technique is presented and validated in a steady, turbulent, two-dimensional boundary layer on a flat, uniform-heat-flux wall. Care is taken to properly account for radiation from the wall and conduction within the thermocouple wire. In the same setting, heat flux measurements are made for verification purposes using an energy balance on a segment of the test wall carefully designed to minimize and include radiation and conduction effects. Heat flux values measured by the boundary layer measurement technique and by the energy balance measurement agree to within 4.4% and the difference between the two lie completely within their respective measurement uncertainties of 5.74% and 0.6%.

References

References
1.
Blackwell
,
B. F.
, and
Moffat
,
R. J.
,
1975
, “
Design and Construction of a Low Velocity Boundary Temperature Probe
,”
ASME J. Heat Transfer
,
97
(
2
), pp.
313
315
.
2.
Qiu
,
S.
,
Simon
,
T. W.
, and
Volino
,
R. J.
,
1995
, “
Evaluation of Local Wall Temperature, Heat Flux and Convective Heat Transfer Coefficient From the Near-Wall Temperature Profile, ‘Heat Transfer in Turbulent Flows’
,”
Heat Transfer Division
, ASME, New York, Vol.
318
, pp.
45
52
.
3.
Kulkarni
,
K. S.
,
Han
,
S.
, and
Goldstein
,
R. J.
,
2011
, “
Numerical Simulation of Thermal Boundary Layer Profile Measurement
,”
Heat Mass Transfer
,
47
(
8
), pp.
869
877
.
4.
Han
,
S.
, and
Goldstein
,
R. J.
,
2007
, “
Heat Transfer Study in a Linear Turbine Cascade Using a Thermal Boundary Layer Measurement Technique
,”
ASME J. Heat Transfer
,
129
(
10
), pp.
1384
1394
.
5.
Kulkarni
,
K. S.
,
Madanan
,
U.
,
Mittal
,
R.
, and
Goldstein
,
R. J.
,
2017
, “
Experimental Validation of Heat/Mass Transfer Analogy for Two-Dimensional Laminar and Turbulent Boundary Layers
,”
Int. J. Heat Mass Transfer
,
113
, pp.
84
95
.
6.
Mittal
,
R.
,
Madanan
,
U.
, and
Goldstein
,
R. J.
,
2017
, “
The Heat/Mass Transfer Analogy for a Backward Facing Step
,”
Int. J. Heat Mass Transfer
,
113
, pp.
411
422
.
7.
Clauser
,
F. H.
,
1954
, “
Turbulent Boundary Layers in Adverse Pressure Gradients
,”
J. Aerosp. Sci.
,
21
(
2
), pp.
91
108
.
8.
Schlichting
,
H.
, and
Gersten
,
K.
,
2000
,
Boundary-Layer Theory
,
8th ed.
,
Springer-Verlag
,
Berlin
.
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