THIN-FILM HEAT TRANSFER GAGES
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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An extensive literature survey on thin-film heat transfer gages was accomplished and pertinent references are listed. Methods and techniques for fabricating, calibrating, and using thin-film gages are discussed. Thin-film gages were fabricated using liquid platinum paint applied to a quartz backing material, and were calibrated using the electrical single pulse method. Rates of heat transfer were determined for a station on the wall of a shock tube for the laminar boundary layer flow condition immediately after shock wave passage for shock Mach numbers between 1.15 and 2.50. The variation of the wall surface temperature with time associated with shock wave passage was also determined. The results were correlated with theoretically predicted values and with the experimental results given by Hartunian and Weatherston. The thin-film gages constructed for this study had determined values of 12 square root of pi rho kc of 0.067 plus or minus 0.005 Bsq ft F square of sec, and measured values for sensitivity of resistance to temperature ranging from 0.000905 to 0.001375 ohmohm F.
- Test Facilities, Equipment and Methods