Heat Pulse Method for Determination of Thermal Diffusivity of Liquid Crystals

1987 ◽  
Vol 26 (Part 2, No. 6) ◽  
pp. L1000-L1003 ◽  
Author(s):  
Tadashi Akahane ◽  
Masumi Kondoh ◽  
Kenji Hashimoto ◽  
Masahiro Nakagawa
Keyword(s):  
Liquid Crystals ◽  
Thermal Diffusivity ◽  
Pulse Method ◽  
Heat Pulse

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.

Experimental determination of thermophysical properties by line heat pulse method

2018 ◽  
Vol 12 (4) ◽  
pp. 2524-2534 ◽  
Author(s):  
Katarzyna Kozłowicz ◽  
Dariusz Góral ◽  
Franciszek Kluza ◽  
Małgorzata Góral ◽  
Dariusz Andrejko
Keyword(s):  
Experimental Determination ◽  
Thermophysical Properties ◽  
Pulse Method ◽  
Heat Pulse

Dental Plating Efficiency of Metal Base Dental Alloys by Thermal Diffusivity Study

2015 ◽  
Vol 638 ◽  
pp. 141-144
Author(s):  
Marian Miculescu ◽  
Marin Bane ◽  
Florin Miculescu ◽  
Oana Preda ◽  
Ioan Plotog
Keyword(s):  
Thermal Diffusivity ◽  
Pulse Method ◽  
Test Methods ◽  
Metal Base ◽  
Metal Ceramic ◽  
Thermal Compatibility ◽  
Properties Of Materials ◽  
Dental Applications ◽  
Alloys And Compounds

The need for reliable data on thermophysical properties of materials has increased continuously in the last period. The existing data, except for some pure elements or alloys and compounds, often unreliable, and in many cases the need for accurate and acceptable data, can only be achieved by measuring a given property. This paper focuses on elements of the used test methods associated with the description of the newly introduced parameter (effectiveness of dental coating). The selected method was the “pulse method” for determining thermal diffusivity (the method allows simultaneous determination of thermal diffusivity, specific heat capacity and thermal conductivity) directly applicable in the study of the thermal compatibility of metal-ceramic systems in dental applications.

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