Thermal measuring and testing – Determination of inherent thermal property – Thermal conductivity
Reexamination Certificate
2008-04-01
2008-04-01
Verbitsky, Gail (Department: 2855)
Thermal measuring and testing
Determination of inherent thermal property
Thermal conductivity
C374S110000, C374S102000, C374S148000
Reexamination Certificate
active
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.
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Egolf Peter Williams
Sari Osmann
Davis & Bujold & Daniels, P.L.L.C.
Haute Ecole d'Ingénierie et de Gestion du Canton de Vaud
Jagan Mirellys
Verbitsky Gail
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