Radiation-corrective Gas Temperature
Measurement In A Circular Channel
Author(s)
C. S. Kim, S. D. Hong & Y. W. Kim
Abstract
Gas temperature measurement by a probe-type thermometer has a large bias
because of the thermal radiation effect on the measured surface. In the gas flow,
the convective heat transfer coefficient on the thermocouple surface is not large
enough to neglect the thermal radiation effect from the sheath tube. Therefore,
the measured temperature is determined from the energy balance between the
convective heat transfer and the radiation heat transfer on the sheath tube. Korea
Atomic Energy Research Institute has tested the methodology to correct the
thermal radiation effect for the gas temperature measurement. The methodology
is the usage of a couple of thermocouples with unequal diameters called the
Reduced Radiation Error (RRE) method. The RRE value is defined as the ratio
of the temperature difference between the true gas temperature and the measured
temperature from large diameter thermocouple over the measured temperature
difference between the thermocouples with the small and large diameters. The
RRE value is calculated from the convective heat transfer coefficients and the
radiation heat transfer coefficient between two thermocouples. The experimental
results with two thermocouples of unequal diameters of 1/8 inch and 1/16 inch
showed that the RRE method would have good applicability to the gas
temperature measurement in the high temperature and mass flux condition under
negligible conditions with the conductive dissipation through the sheath tubes.
Keywords: internal gas flow, gas temperature measurement, radiation bias,
Reduced Radiation Error (RRE).
Keywords
internal gas flow, gas temperature measurement, radiation bias,Reduced Radiation Error (RRE).
Related Book
Other papers in this volume
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