Method of determination of thermal conduction coefficient and he

Details Method of determination of thermal conduction coefficient and he Method of determination of thermal conduction coefficient and he

1984-04-24

1986-12-23

Frankfort, Charles

Thermal measuring and testing

Determination of inherent thermal property

Thermal conductivity

374 43, 374 29, G01N 2500, G01N 2516, G01K 1700

Patent

active

046309381

ABSTRACT:
A method and apparatus for determination the thermal conduction coefficient and the heat capacity of materials. The method comprises the measurements of heat flux across the sample and the momentary temperature difference between both surfaces of the sample perpendicular to the direction of heat flux during continuous change of the temperature of one of sample surfaces. The values of thermal conduction coefficient, heat capacity and thermal diffusivity are determined on the basis of an equation which defines their dependence on measured heat flux across the sample, temperature difference between the sample surfaces and the rate of the change of the temperature of one sample surface. The apparatus for measuring thermal conductivity and heat capacity contains a heater equipped with a temperature sensor of a thickness less than 1 mm, placed between two samples, one of them being the sample of material tested of a thickness less than 10 mm. The samples are in thermal contact with a flowing gas or liquid stream constituting heat sinks for the samples. The temperature of the flowing medium is changed linearly with time during each measurement run.

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Hager, Jr., Nathaniel, "Miniature Thin Heater Thermal Conductivity Apparatus", 5th Annual ISA Test Measurement Symposium, N.Y., Oct. 1968.
Dynatech Corporation, "Guarded Hot Plate Thermal Conductivity Measuring System", Model TCFGM Series, Mar. 1967.
Markman, M. A. et al., "Apparatus for the Rapid Measurement of Thermal Conductivity of Thermoelectric Materials", Ind. Lab. (USA) vol. 37, No. 10, Oct. 1971.
Grunert, W. E. et al., "Guarded Flat Plate Thermal Conductivity Apparatus for Testing Multi-Foil Insulations in the 20.degree. C.-1000.degree. C. Range", 9th Conf. on Thermal Cond., Ames, Iowa, Oct. 1969.

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