AN EXPERIMENTAL TECHNIQUE FOR THE SIMULTANEOUS ESTIMATION OF THERMAL PROPERTIES OF METALS AS FUNCTIONS OF TEMPERATURE

2021 ◽  
Author(s):  
Mariana de Melo Antunes ◽  
Nícolas Pinheiro Ramos ◽  
Sandro Metrevelle Marcondes de Lima e Silva
Keyword(s):  
Thermal Properties ◽  
Experimental Technique ◽  
Simultaneous Estimation

scholarly journals Simultaneous estimation of thermal properties by non-linear least squares method.

1985 ◽  
Vol 11 (1) ◽  
pp. 84-92 ◽  
Author(s):  
Jun Fukai ◽  
Minoru Watanabe ◽  
Takatoshi Miura ◽  
Shigemori Ohtani
Keyword(s):  
Thermal Properties ◽  
Least Squares ◽  
Least Squares Method ◽  
Simultaneous Estimation ◽  
Linear Least Squares ◽  
Non Linear

scholarly journals Effect of Heat Source and Imperfect Contact on Simultaneous Estimation of Thermal Properties of High-Conductivity Materials

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Giampaolo D’Alessandro ◽  
Filippo de Monte ◽  
Donald E. Amos
Keyword(s):  
Heat Capacity ◽  
Thermal Properties ◽  
Heated Surface ◽  
Thermal Contact ◽  
High Conductivity ◽  
Simultaneous Estimation ◽  
Transform Method ◽  
Imperfect Contact ◽  
Experimental Apparatus ◽  
Layer Sample

In the current paper a novel methodology accounting for both the heater heat capacity and the imperfect thermal contact between a thin heater and a specimen is proposed. In particular, the volumetric heat capacity of the heater is considered by modelling it as a lumped capacitance body, while the imperfect thermal contact is considered by means of a contact resistance. Thus, the experimental apparatus consisting of three layers (specimen-heater-specimen) is reduced to a single finite layer (sample) subject to a “nonclassical” boundary condition at the heated surface, known as sixth kind. Once the temperature solution is derived analytically using the Laplace transform method, the scaled sensitivity coefficients are computed analytically at the interface between the heater and the sample (heater side and sample side) and at the sample backside. By applying the proposed methodology to a lab-controlled experiment available in the specialized literature, a reduction of the thermal properties values of about 1.4% is observed for a high-conductivity material (Armco iron).

SIMULTANEOUS ESTIMATION OF ELECTRICAL AND THERMAL PROPERTIES OF MATERIAL FROM THE TONE-BURST EDDY CURRENT THERMOGRAPHY (TBET) TIME-TEMPERATURE DATA

2010 ◽  
Author(s):  
N. Biju ◽  
N. Ganesan ◽  
C. V. Krishnamurthy ◽  
Krishnan Balasubramaniam ◽  
Donald O. Thompson ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Eddy Current ◽  
Tone Burst ◽  
Temperature Data ◽  
Simultaneous Estimation

Simultaneous estimation of thermal properties via measurements using one active heating surface and Bayesian inference

2022 ◽  
Vol 172 ◽  
pp. 107304
Author(s):  
José Aguiar Santos ◽  
José Ricardo Ferreira Oliveira ◽  
Jefferson Gomes do Nascimento ◽  
Ana Paula Fernandes ◽  
Gilmar Guimaraes
Keyword(s):  
Thermal Properties ◽  
Bayesian Inference ◽  
Heating Surface ◽  
Simultaneous Estimation

Simultaneous Estimation of Thermal Properties Using Genetic Algorithm

2017 ◽  
Author(s):  
Jefferson Gomes do Nascimento ◽  
ALISSON FIGUEIREDO ◽  
Luis Henrique da Silva Ignacio ◽  
Gilmar Guimaraes ◽  
FERNANDO MALHEIROS
Keyword(s):  
Genetic Algorithm ◽  
Thermal Properties ◽  
Simultaneous Estimation

Inverse Estimation of Thermal Properties in a Semitransparent Graded Index Medium With Radiation-Conduction Heat Transfer

2018 ◽  
Vol 140 (9) ◽  
Author(s):  
Sina Khayyam ◽  
S. M. Hosseini Sarvari
Keyword(s):  
Refractive Index ◽  
Thermal Properties ◽  
Measurement Errors ◽  
Single Scattering ◽  
Discrete Ordinates ◽  
Simultaneous Estimation ◽  
Unknown Parameters ◽  
Graded Index ◽  
Scattering Phase Function ◽  
Volume Method

An inverse radiation-conduction analysis is performed for simultaneous estimation of the thermal properties in an absorbing, emitting, and linear-anisotropically scattering medium with spatially variable refractive index. The discrete ordinates method in conjugation with finite volume method is adopted to solve the direct problem. The conjugate gradient method (CGM) is employed to simultaneously estimate the conduction-radiation parameter, optical thickness, single scattering albedo, scattering phase function, and the wall emissivities from the knowledge of the exit radiation intensities over the boundaries. The effects of these parameters and the measurement errors on the precision of the inverse analysis are investigated. Results show that the proposed inverse approach can successfully retrieve the unknown parameters for different refractive index profiles.

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