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Measurement of thermal conductivity and specific heat

  • US 4,944,035 A
  • Filed: 06/24/1988
  • Issued: 07/24/1990
  • Est. Priority Date: 06/24/1988
  • Status: Expired due to Term
First Claim
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1. Apparatus for determining thermal conductivity, k, and specific heat, cp, of a fluid of interest comprising;

  • heater means;

    thermal sensor means in proximate position to said heater means and in thermal communication therewith through the fluid of interest, said sensor means being one having a temperature dependent output;

    adjustable energizing means connected to said heater means for energizing said heater means on a pulsed time-variable basis in a manner to induce both transient and substantially steady-state elevated temperature condition intervals in said thermal sensor means;

    first output means for providing first output signal indicative of the temperature of said thermal sensor means;

    means for determining the rate of change of temperature of said temperature sensor during a transient temperature interval based on time variation of said first output signal;

    means for detemining k of the fluid of interest based upon the first output signal at steady-state elevated sensor temperature; and

    means for determining Cp, of the fluid of interest based on k and the rate of change of the first output during a transient temperature condition.

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