The hot-wire method in the unsteady-state variant
Abstract
The solution to the heat conduction equation for a cylindrical layer is used to develop an unsteady-state variant of the hot-wire method for the case of monotonic variations of the temperature of a calorimeter system. In contrast to the steady-state variant, this method allows the determination, from a single experiment, of the temperature-dependence of the thermal conductivity of fluids in a wide range of temperatures. A compact formula is obtained for the temperature-dependence of thermal conductivity, along with expressions for the optimal heating rate of the calorimeter system and corrections for the specific heat of the layer under investigation.
- Publication:
-
Inzhenerno Fizicheskii Zhurnal
- Pub Date:
- November 1976
- Bibcode:
- 1976InFiZ..31..821M
- Keywords:
-
- Calorimeters;
- Heat Measurement;
- Hot-Wire Flowmeters;
- Temperature Compensation;
- Thermal Conductivity;
- Instrument Errors;
- Unsteady State;
- Instrumentation and Photography