Article

A compensation method for the disturbance in the temperature field caused by subsurface thermocouples

Metallurgical and Materials Transactions B (impact factor: 0.9). 04/2012; 37(3):475-483. DOI:10.1007/s11663-006-0031-x pp.475-483

ABSTRACT The presence of a subsurface thermocouple hole can lead to a local disturbance of the temperature field in a sample and to
a discrepancy between the thermal history measured by the thermocouple and the thermal history in an area without a thermocouple.
This phenomenon also leads to errors in the surface heat flux calculated using an inverse heat conduction model, which relies
on the acquired thermal history data. This article analyzes the factors that influence the temperature discrepancy caused
by a subsurface thermocouple hole. A technique called the “equivalent depth” technique is proposed to compensate for the disturbance
of the temperature field due to the presence of a thermocouple hole. This technique involves off-setting the location of the
thermocouple position based on the radius of the thermocouple hole. A verification of this technique for the calculation of
the surface heat flux using an inverse heat conduction model with measured thermal history data is presented.

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Keywords

acquired thermal history data
 
article analyzes
 
inverse heat conduction model
 
local disturbance
 
off-setting
 
subsurface thermocouple hole
 
surface heat flux
 
temperature discrepancy
 
temperature field
 
thermal history
 
thermal history data
 
thermocouple hole
 
thermocouple position
 
verification
 
“equivalent depth” technique
 

E. Caron