Method and apparatus for measuring fluid thermal conductivity

Details Method and apparatus for measuring fluid thermal conductivity Method and apparatus for measuring fluid thermal conductivity

G - Physics

01

N

G01N 25/18 (2006.01)

Patent

CA 2098867

A heating sensor is disposed within the pipe wherein a clearance defined between inner wall of the measuring pipe and outer surface of the heating sensor is dimensioned so that the measurement may be free from any influence of a connective heat transfer. Temperatures of the fluid and the heating sensor are measured and a differential temperature therebetween in the steady state is determined. A correlation established between the differential temperature and a thermal conductivity of the fluid is utilized to obtain the thermal conductivity of this fluid. Alternatively, the differential temperature between the fluid being measured and the heating sensor may be controlled at a constant value and a correlation between a heating value of the heating sensor and the thermal conductivity of the fluid may be utilized to determine the thermal conductivity of this fluid based on an actual heating value of the heating sensor. A temperature of the fluid staying within the measuring pipe can be controlled by thermostatic means. The said clearance may be provided by, the heating sensor and the movable spacer adapted to maintain a predetermined gap with respect to outer surface of said heating sensor.

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