Estimating the Thermal Properties of a Calorimeter Using Hierarchical Bayesian Inference With MCMC

2007 ◽  
Author(s):  
A. F. Emery ◽  
D. Bardot
Keyword(s):  
Heat Transfer ◽  
Thermal Properties ◽  
Bayesian Inference ◽  
Specific Heat ◽  
Accurate Determination ◽  
Complex Function ◽  
Thermal Characteristics ◽  
Ambient Conditions ◽  
Hierarchical Bayesian Inference

The accurate determination of the specific heat by placing of a sample in a bath of liquid and measuring the temperature change of the bath and the sample is dependent upon estimation of the heat lost to or gained from the calorimeter. This heat transfer is a complex function of the thermal characteristics of the calorimeter, the initial and ambient conditions, and the convective heat transfer between the bath and the calorimeter walls. This paper describes the estimation of the heat transfer and the determination of the uncertainties in the computed sample specific heat by using Bayesian inference.

Thermal Conductivity and Specific Heat Evaluation of Tissue Using Laser

2020 ◽  
Vol 1002 ◽  
pp. 303-310
Author(s):  
Sudad Issam Younis ◽  
Haqi I. Qatta ◽  
Mohammed Jalal Abdul Razzaq ◽  
Khalid S. Shibib
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Thermal Properties ◽  
Specific Heat ◽  
Iterative Procedure ◽  
Input Data ◽  
Maximum Error ◽  
Heat Transfer Analysis ◽  
Long Wavelength ◽  
Inverse Heat Transfer

In this work, an inverse heat transfer analysis was used to determine thermal conductivity and specific heat of tissue using special iteration. A laser with a long wavelength was utilized to impose heat to the tissue. The heat that induced in the sample causes an increase in the temperature of a tissue which is measured by a thermocouple. The readings were used together with that analytically obtained from the solution of the heat equation in an iterative procedure to obtain the thermal properties of tissue. By using this method, accurate thermal conductivity and specific heat of tissue could be obtained. It was found that the maximum error in output result and the error in input data were in the same order and that there was a linear relationship between output and input errors.

scholarly journals The Effect of In Situ Synthesis of MgO Nanoparticles on the Thermal Properties of Ternary Nitrate

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5737
Author(s):  
Zhiyu Tong ◽  
Linfeng Li ◽  
Yuanyuan Li ◽  
Qingmeng Wang ◽  
Xiaomin Cheng
Keyword(s):  
Heat Transfer ◽  
Heat Capacity ◽  
Thermal Properties ◽  
Specific Heat ◽  
Molten Salt ◽  
Specific Heat Capacity ◽  
Ternary Eutectic ◽  
Mgo Nanoparticles ◽  
Nitrate System

The multiple eutectic nitrates with a low melting point are widely used in the field of solar thermal utilization due to their good thermophysical properties. The addition of nanoparticles can improve the heat transfer and heat storage performance of nitrate. This article explored the effect of MgO nanoparticles on the thermal properties of ternary eutectic nitrates. As a result of the decomposition reaction of the Mg(OH)2 precursor at high temperature, MgO nanoparticles were synthesized in situ in the LiNO3–NaNO3–KNO3 ternary eutectic nitrate system. XRD and Raman results showed that MgO nanoparticles were successfully synthesized in situ in the ternary nitrate system. SEM and EDS results showed no obvious agglomeration. The specific heat capacity of the modified salt is significantly increased. When the content of MgO nanoparticles is 2 wt %, the specific heat of the modified salt in the solid phase and the specific heat in the liquid phase increased by 51.54% and 44.50%, respectively. The heat transfer performance of the modified salt is also significantly improved. When the content of MgO nanoparticles is 5 wt %, the thermal diffusion coefficient of the modified salt is increased by 39.3%. This study also discussed the enhancement mechanism of the specific heat capacity of the molten salt by the nanoparticles mainly due to the higher specific surface energy of MgO and the semi-solid layer that formed between the MgO nanoparticles and the molten salt.

Flame-Contact Studies

1964 ◽  
Vol 86 (3) ◽  
pp. 449-456 ◽  
Author(s):  
A. M. Stoll ◽  
M. A. Chianta ◽  
L. R. Munroe
Keyword(s):  
Heat Transfer ◽  
Thermal Properties ◽  
Heat Flow ◽  
Mathematical Analysis ◽  
Experimental Validation ◽  
Thin Layers ◽  
Thermal Properties Of Materials ◽  
Properties Of Materials

This paper is composed of three parts: 1 Apparatus and method for determination of heat transfer through fabric during flame contact; 2 experimental validation of mathematical analysis and heat flow; 3 application to determination of thermal properties of materials in thin layers.

A Model to Evaluate Heat Transfer to a Particle From Thermal Plasma

2001 ◽  
Author(s):  
Sameer D. Samudra ◽  
Milind A. Jog
Keyword(s):  
Heat Transfer ◽  
Spherical Particle ◽  
Thermal Plasma ◽  
Manufacturing Systems ◽  
Accurate Determination ◽  
Ionized Gas ◽  
Ceramic Particles

Abstract In many plasma-aided manufacturing systems, metallic or ceramic particles are introduced in a thermal plasma. The heat transfer from the plasma to the particle, in part, governs the quality of the products. To design thermal plasma-aided manufacturing systems and to predict their performance, accurate determination of particle heat transfer is necessary. In this paper, a spherical particle introduced in an ionized gas made up of electrons, ions, and neutrals is considered. A model to accurately determine heat transfer to the particle is developed.

Induction heating in estimation of thermal properties of conductive materials

2017 ◽  
Vol 36 (2) ◽  
pp. 458-468 ◽  
Author(s):  
Jerzy Zgraja ◽  
Adam Cieslak
Keyword(s):  
Thermal Properties ◽  
Thermal Diffusivity ◽  
Specific Heat ◽  
Induction Heating ◽  
Treatment Plant ◽  
Pulse Method ◽  
Content Type ◽  
Significant Step ◽  
Thermal Calculations

Purpose The purpose of the research was to develop a method for the determination of temperature characteristics of thermal diffusivity and specific heat on a single and the same stand, powered from an inverter for induction heating. Determination of the thermal diffusivity has been based on the idea of the pulse method. Searched solutions allowed to reduce inaccuracy of the pulse method when such an unusual source of pulse of energy is used. Design/methodology/approach Coupled electromagnetic and thermal calculations were carried out to verify proposed methods for estimating thermal properties of an induction heated charge. Presented methods were applied into a real laboratory stand and they were examined experimentally. Findings Achieved results of calculations allow to estimate thermal properties of the induction heated charge with 2 and 5 per cent of uncertainty, respectively, for heat capacity and thermal diffusivity. It gives possibility to use results as an input for further proceedings connected with estimation of electrical parameters in a more complex system. Practical implications Presented methods of estimating thermal properties of the induction heated charge were verified experimentally on a dedicated laboratory stand. It gives a practical possibility to implement previously established assumptions and examine them. This is a significant step toward the construction of an easy-to-use device for a comprehensive determination of material parameters of metals directly in the heat treatment plant. Originality/value This study presents a trial of implementation of induction heating as a source of energy in the impulse method for estimation of thermal properties of the material. Additionally, it presents a process of improving results achieved with the flash methods which were presented in previous papers. The method of estimation of specific heat which uses induction heating as the heat source was presented too.

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