Extending the Capabilities of the Multiproperty Apparatus for Thermophysical Property Determinations

  • Mukund S. Deshpande
  • Raymond E. Taylor


The unique multiproperty apparatus developed at Purdue University has proven to be a powerful scientific and engineering tool. Efforts were made to increase its usefulness even further. Successful efforts were made to relax geometrical constraints on the samples, as a result of which the multiproperty apparatus can handle larger diameter samples. In addition to weakening geometrical limitations on samples, thermal conductivity measurement in an inert argon atmosphere was also demonstrated. Agreement within 5% was obtained with data obtained in vacuum. Since the presence of an atmosphere restricts sample vaporization, higher measurement temperature should be attainable.

Efforts were also made to increase the accuracy of Thomson coefficient values. The iterative approach was adopted to develop computer programs. Our experience in their use showed that the uncertainty in the measurement was reduced, but that the scatter is still unacceptable.

A new method to measure Seebeck Coefficient on multiproperty apparatus was attempted by using AC direct heating rather than DC heating. A signal conditioning unit, which measures very low level DC signals in the presence of large AC signals, was constructed. The results obtained by its use show large errors are associated with this method and further efforts are needed to identify the sources of errors in order to improve it.


Seebeck Coefficient Thermal Conductivity Measurement Radial Temperature Gradient Thomson Coefficient Inert Argon Atmosphere 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



cross sectional area of a sample


cross sectional area of sample at position z


convection heat transfer coefficient


overall radiation heat transfer coefficient


current flowing through conductor (amps)


current density


Equation (6)


unit normal vector


perimeter of sample cross section


radial position


Seebeck coefficient (many times denoted as thermopower of thermocouple in literature)




temperature as a function of position r and z


temperature of position 1


temperature of position 2


maximum temperature


ambient temperature


temperature at surface




longitudinal position


longitudinal position on sample where temperature is maximum


longitudinal position 1


longitudinal position 2


delta operator


delta — refers differential quantity (e.g., ΔT — temperature difference, ΔV — voltage difference, etc.)


total hemispherical emissivity


convection emissivity factor


overall heat transfer emissivity factor


electrical resistivity


Stephen Boltzmann constant


the thermal conductivity


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Copyright information

© Purdue Research Foundation 1983

Authors and Affiliations

  • Mukund S. Deshpande
    • 1
  • Raymond E. Taylor
    • 1
  1. 1.Thermophysical Properties Research Laboratory School of Mechanical EngineeringPurdue UniversityWest LafayetteUSA

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