CFD simulation of simultaneous monotonic cooling and surface heat transfer coefficient
- Institute of Construction and Architecture, Slovak Academy of Sciences, Dubravska cesta 9, 845 03 Bratislava (Slovakia)
The monotonic heating regime method for determination of thermal diffusivity is based on the analysis of an unsteady-state (stabilised) thermal process characterised by an independence of the space-time temperature distribution on initial conditions. At the first kind of the monotonic regime a sample of simple geometry is heated / cooled at constant ambient temperature. The determination of thermal diffusivity requires the determination rate of a temperature change and simultaneous determination of the first eigenvalue. According to a characteristic equation the first eigenvalue is a function of the Biot number defined by a surface heat transfer coefficient and thermal conductivity of an analysed material. Knowing the surface heat transfer coefficient and the first eigenvalue the thermal conductivity can be determined. The surface heat transport coefficient during the monotonic regime can be determined by the continuous measurement of long-wave radiation heat flow and the photoelectric measurement of the air refractive index gradient in a boundary layer. CFD simulation of the cooling process was carried out to analyse local convective and radiative heat transfer coefficients more in detail. Influence of ambient air flow was analysed. The obtained eigenvalues and corresponding surface heat transfer coefficient values enable to determine thermal conductivity of the analysed specimen together with its thermal diffusivity during a monotonic heating regime.
- OSTI ID:
- 22608488
- Journal Information:
- AIP Conference Proceedings, Vol. 1752, Issue 1; Conference: THERMOPHYSICS 2016: 21. international meeting on thermophysics, Terchova (Slovakia), 12-14 Oct 2016; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AIR FLOW
AMBIENT TEMPERATURE
BOUNDARY LAYERS
COOLING
EIGENVALUES
HEAT FLUX
HEAT TRANSFER
HEATING
LONG WAVE RADIATION
REFRACTIVE INDEX
SIMULATION
SPACE-TIME
SURFACES
TEMPERATURE DISTRIBUTION
THERMAL CONDUCTIVITY
THERMAL DIFFUSIVITY