New device and method for measuring thermal conductivity of thin-films.
Thermal sensitive paints (TSPs) are used for global nonintrusive detection of boundary layer transition in flow over the surface of wind tunnel research models. Since the transition is a transient process, the TSP should have a fast response characteristic. A low paint thermal conductivity is required for fast response. A thin-film thermal conductivity meter (TFTCM) was designed and built to measure thermal conductivity of the TSPs, which are typically between 50 and 150 microm thick. In this paper, the design and operating features of the TFTCM are described. Measurement of the thermal conductivity with this TFTCM of three standard thin-film low conductivity specimens, Kapton, Teflon, and Borofloat glass, showed good agreement with the manufacturer quoted values, thus validating the instrument and the procedure. Consistently repeatable values for thermal conductivity (k=0.41 +/- 0.02 W/m K) were also obtained for the TSP specimen (TSB-B, 75 microm) tested.
Subramanian
Chelakara S
CS
Mechanical & Aerospace Engineering, Florida Institute of Technology, Melbourne 32901, USA.
Amer
Tahani
T
UpChurch
Billy T
BT
Alderfer
David W
DW
Burkett
Cecil
C
Sealey
Bradley
B
D004867:Equipment Design; D019544:Equipment Failure Analysis; D008422:Materials Testing / Q000295:instrumentation*; D008567:Membranes, Artificial; D010150:Paint / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013814:Thermal Conductivity; D013817:Thermography / Q000295:instrumentation* / Q000379:methods
D008567:Membranes, Artificial