Method and device for measuring the thermal conductivity of...

Thermal measuring and testing – Determination of inherent thermal property – Thermal conductivity

Reexamination Certificate

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C374S110000, C374S102000, C374S148000

Reexamination Certificate

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07350971

ABSTRACT:
The invention relates to a method and a device for the continuous measurement (30) of the thermal conductivity of a multifunctional fluid. The inventive method consists of: placing a sample of the multifunctional fluid in a space (31) which is defined by an inlet face and an outlet face; transmitting at least one very brief pulse of a heat flux to the sample via the inlet face, using a laser (40); measuring the heat wave at least three points which are spaced out inside the sample; using at least three temperature sensors (S1, S2, S3) in order to determine the change in the temperature of the multifunctional fluid as a function of time at the three spaced-out points inside the sample; deducing the thermodynamic characteristics of the sample from the aforementioned temperature change and calculating the thermal conductivity from equation (I), wherein T represents thermal conductivity which is dependent on temperature, t represents thermal diffusivity which is dependent on k and which is equal to k(T)/ρ*Cp, ρ and Cp representing mass density and specific heat.

REFERENCES:
patent: 5232543 (1993-08-01), Frelich et al.
patent: 5258929 (1993-11-01), Tsuchida
patent: 5311447 (1994-05-01), Bonne
patent: 199 49 327 (2001-04-01), None
Parker W J et al: “Flash Method of Determining Thermal Diffusivity, Heat Capacity, and Thermal Conductivity” Journal of Applied Physics, American Institute of Physics, New York, US, vol. 32, No. 9, Sep. 1, 1961, pp. 1679-1684, XP000616804 ISSN: 0021-8979 Article de base sur le principe de la mesure par “flash laser” the whole document.
Gobbe C et al: “Mise en Oeuvre de la Methode Flashe Pour la Mesure de Diffusivite Thermique Sur Des Materiaux Liquides ou Fondus en Fontcion de la Temperature. Application AUX Polymeres” Revue de Physique Apploquee, Les Editions de Physique. Paris, FR, vol. 24, No. 12, Dec. 1, 1989, pp. 1119-1128, X000080289 p. 1119, col. 1—p. 1120, col. 2 p. 1121, col. 2, paragraph 2.1—p. 1122, col. 2.
Hiromichi Ohta et al: Thermal Diffusivity Measurements of Moten Salts Using a Three-Layered Cell by the Laser Flash Method: Review of Scientific Instruments, American Institute of Physics. New York, US, vol. 61, No. 10, Oct. 1, 1990, pp. 2645-2649, XP000172298 ISSN: 0034-6748 p. 2654, paragraph 1 figure 2.

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