Rectangular heat source on a semi-infinite solid: An analysis of a thin film heat flux gage
Abstract
A thin film flux gage was developed for a series of combustion experiments. The gage was designed to provide both rapid response and long use time. Initial calibrations using standard techniques indicated large differences between the literature and the estimated properties. In order to calibrate this gage without resorting the destructive property measurements, an analytical model of the gage response to a step heating current was developed. The model is in the form of three algebraic expressions which correspond to the early, middle, and late time regimes. The expressions are used to provide a framework for least squares estimates of the gage parameters. There is very good agreement between the model and the experimental data. The estimated parameter values demonstrate good to excellent repeatability and good agreement with both new literature data and results from destructive property measurements.
- Publication:
-
National Heat Transfer Conference
- Pub Date:
- May 1984
- Bibcode:
- 1984nht..confR....K
- Keywords:
-
- Calibrating;
- Flame Propagation;
- Green'S Functions;
- Heat Sources;
- Measuring Instruments;
- Surface Temperature;
- Thin Films;
- Adiabatic Conditions;
- Heat Flux;
- Laplace Transformation;
- Least Squares Method;
- Thermal Conductivity;
- Instrumentation and Photography