Abstract
| Original language | English |
|---|---|
| Place of Publication | Espoo |
| Publisher | VTT Technical Research Centre of Finland |
| Number of pages | 26 |
| ISBN (Print) | 951-38-4345-9 |
| Publication status | Published - 1993 |
| MoE publication type | Not Eligible |
Publication series
| Series | VTT Tiedotteita - Meddelanden - Research Notes |
|---|---|
| Number | 1452 |
| ISSN | 1235-0605 |
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Keywords
- fire safety
- temperature
- measurement
- thermal diffusivity
- thermophysical properties
- heat transfer
- calculations
- utilization
- experimentations
- numerical analysis
- test methods
- transiet analysis
- time
- mineral wool
- calcium silicates
- insulating boards
- geometry
Cite this
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A transient symmetrical method for the measurement of temperature dependent thermal diffusivity. / Kokkala, Matti; Baroudi, Djebar.
Espoo : VTT Technical Research Centre of Finland, 1993. 26 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 1452).Research output: Book/Report › Report
TY - BOOK
T1 - A transient symmetrical method for the measurement of temperature dependent thermal diffusivity
AU - Kokkala, Matti
AU - Baroudi, Djebar
PY - 1993
Y1 - 1993
N2 - Determination of temperature dependent thermal diffusivities using a transient symmetrical method was studied. The thermal diffusivity is determined from the temperature profile in a specimen constructed of thin slabs and heated symmetrically from both sides. The thermal diffusivity is determined as the ratio of the time derivate and the second spatial derivate at the position of the extremum of temperature. A numerical method was developed to calculate the thermal diffusivity as a function of time including the confidence interval of the diffusivity. The numerical methods were validated by using numerically calculated temperature profiles for a material with known thermal diffusivity. Preliminary tests were conducted to investigate the practical applicability of the method. The method proved to work for an inert material when no changes of geometry of the sample occurred. If reactions, convection, or substantial thermal expansions causing gaps inside the specimen occur, the results will not be well-defined.
AB - Determination of temperature dependent thermal diffusivities using a transient symmetrical method was studied. The thermal diffusivity is determined from the temperature profile in a specimen constructed of thin slabs and heated symmetrically from both sides. The thermal diffusivity is determined as the ratio of the time derivate and the second spatial derivate at the position of the extremum of temperature. A numerical method was developed to calculate the thermal diffusivity as a function of time including the confidence interval of the diffusivity. The numerical methods were validated by using numerically calculated temperature profiles for a material with known thermal diffusivity. Preliminary tests were conducted to investigate the practical applicability of the method. The method proved to work for an inert material when no changes of geometry of the sample occurred. If reactions, convection, or substantial thermal expansions causing gaps inside the specimen occur, the results will not be well-defined.
KW - fire safety
KW - temperature
KW - measurement
KW - thermal diffusivity
KW - thermophysical properties
KW - heat transfer
KW - calculations
KW - utilization
KW - experimentations
KW - numerical analysis
KW - test methods
KW - transiet analysis
KW - time
KW - mineral wool
KW - calcium silicates
KW - insulating boards
KW - geometry
M3 - Report
SN - 951-38-4345-9
T3 - VTT Tiedotteita - Meddelanden - Research Notes
BT - A transient symmetrical method for the measurement of temperature dependent thermal diffusivity
PB - VTT Technical Research Centre of Finland
CY - Espoo
ER -