Measurement of thermal conductivity and specific heat

Details Measurement of thermal conductivity and specific heat Measurement of thermal conductivity and specific heat

G - Physics

01

N

354/29

G01N 25/18 (2006.01) G01N 25/00 (2006.01)

Patent

CA 1336621

A method and apparatus for determining both the thermal conductivity, k, and specific heat, cp, of a fluid of interest are disclosed. An embodiment uses proximately positioned resistive heater and thermal sensor coupled by the fluid of interest. A pulse of electrical energy is applied to the heater of a level and duration such that both a transient change and a substantially steady-state temperature occur in the sensor. The k of the fluid of interest is determined based upon a known relation between the sensor output and k at steady-state sensor temperature; and cp of the fluid of interest is determined based on a known relation among k, the rate of change of the sensor output during a transient temperature change in the sensor and cp.

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