Data analysis methods for flash thermal diffusivity experiments
New methods, based on nonlinear least squares techniques, are presented for reducing flash diffusivity data obtained on layered composite samples. Analytical solutions to the transient heat conduction equation are derived by the Laplace transform technique for the cases of two and three layer samples with interfacial thermal resistance between the layers and thermal losses at the external boundaries. The use of the analytical solutions in least squares fitting programs is then discussed, with emphasis on the two layer problem. A description of FORTRAN computer programs which implement the calculations is given, with emphasis on the non-linear least squares fitting routine LSTSQRSL3. This program can determine the external boundary thermal loss factor and either the thermal diffusivity of one of the layers or the interfacial resistance between the layers. Two examples of the use of this program are given. In the first, the thermal diffusivity of an alumina layer in a graphite-alumina sample is determined, and in the second, the diffusivity of an enamel paint on a stainless steel substrate is determined. 34 refs., 12 figs., 2 tabs.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6312039
- Report Number(s):
- SAND-89-0260; ON: DE89010274
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
CONFIT: a computer code for thermal conductivity probe data reduction with the use of parameter estimation techniques
Solids mixing and separation
Related Subjects
42 ENGINEERING
THERMAL DIFFUSIVITY
DATA ANALYSIS
ALUMINIUM OXIDES
COMPUTERIZED SIMULATION
D CODES
F CODES
FORTRAN
L CODES
LAYERS
LEAST SQUARE FIT
MATHEMATICAL MODELS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
COMPUTER CODES
MAXIMUM-LIKELIHOOD FIT
NUMERICAL SOLUTION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PROGRAMMING LANGUAGES
SIMULATION
THERMODYNAMIC PROPERTIES
990230* - Mathematics & Mathematical Models- (1987-1989)
990220 - Computers
Computerized Models
& Computer Programs- (1987-1989)
420400 - Engineering- Heat Transfer & Fluid Flow