scholarly journals Determination of thermal conductivity coefficient by Green-Kubo formula using the minimum image method

2019 ◽  
Vol 25 (2) ◽  
pp. 99-103 ◽  
Author(s):  
Krzysztof Hyżorek ◽  
Karol Ciesielczyk ◽  
Konstantin V. Tretiakov
Keyword(s):  
Thermal Conductivity ◽  
Thermal Conductivity Coefficient ◽  
Image Method ◽  
Kubo Formula

scholarly journals Analysis of Specificity of ecological insulation material thermal Parameters

2018 ◽  
Vol 251 ◽  
pp. 01011 ◽  
Author(s):  
Baiba Gaujena ◽  
Jelena Tihana ◽  
Anatolijs Borodinecs ◽  
Vladislavs Agapovs
Keyword(s):  
Thermal Conductivity ◽  
Water Absorption ◽  
Thermal Conductivity Coefficient ◽  
Insulation Material ◽  
Drying Process ◽  
Hemp Fiber ◽  
Characteristics Method ◽  
Quality Water ◽  
Absorption Thickness

This paper is devoted to analysis of insulation materials quality and characteristics, method for the determination of thermal conductivity coefficient and the influence of various factors on the thermal conductivity coefficient. The paper summarizes the estimated process consumption of thermal energy. The research is defined experimental hemp fiber-sheaves insulation plates manufactured in Latvia further specified actual parameter and quality water absorption; thickness changes; drying process; thermal conductivity coefficient; thermal conductivity coefficient depending from moisture. Research is made using experimental hemp fiber-sheaves insulation pattern manufactured in Latvia – plates in size 300 x 300 mm. In research totally are used three hemp fiber-sheaves pattern series with different substance and extrusion modes. Each series consist from four plate with different thickness. As result of research is determined hemp fiber-sheaves insulation pattern Water absorption, dynamics of Drying process, Thickness changes, Thermal conductivity coefficient and Thermal conductivity coefficient depending from moisture.

scholarly journals Thermal Conducting Properties of Metal-fluoroplastic Material Determined by Tribological Method

2021 ◽  
pp. 378-384
Author(s):  
Vasily N. Kornopoltsev ◽  
Bair B. Damdinov
Keyword(s):  
Thermal Conductivity ◽  
Sheet Metal ◽  
Thermal Conductivity Coefficient ◽  
Steel Substrate ◽  
Approximate Determination ◽  
Fourier Law ◽  
Thermophysical Characteristics ◽  
Friction Zone ◽  
Thermal Conducting

The work is devoted to considering the possibility of using the Fourier law and the data of tribological tests for the approximate determination of the thermophysical characteristics of the sheet metal-fluoroplastic material on a steel substrate. The thermal conductivity coefficient of two different fluoroplastic materials was determined by tribological method using the temperature difference in the friction zone. It was shown that friction conditions change from viscoelastic to plastic

A Simple Method for Determination of Thermal Conductivity Coefficients of Thin Films

2001 ◽  
Author(s):  
Chi Hsiang Pan ◽  
Chien Li Tung
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Thermal Conductivity Coefficient ◽  
Crystalline Silicon ◽  
Silicon Film ◽  
Simple Method ◽  
Active Devices ◽  
Analytical Expressions

Abstract In this paper, we present a simple method to determine thermal conductivity coefficients (TCC) of thin films with a compact characterization microstructure and by using common measuring apparatus. The microstructure can be fabricated by a simple surface micromachining technique and in situ along with active devices on the same chip. Analytical expressions are derived to calculate the thermal conductivity coefficients of thin films from the experimental data. Experimental results with a heavily n-doped LPCVD poly crystalline silicon film are used herein to demonstrate the effectiveness of the proposed method. The obtained thermal conductivity coefficient seems to decrease a little as temperature increase and the average is around 39 Wm−1 °C−1 at 400°C below.

The Estimation of the Thermal Properties of Refractory Materials According to the Temperatures Acceleration Curve at the Blast Furnace Blowing-In

2015 ◽  
Vol 1095 ◽  
pp. 476-482 ◽  
Author(s):  
A.N. Dmitriev ◽  
Maxim O. Zolotykh ◽  
Yury A. Chesnokov ◽  
Oleg Yu. Ivanov ◽  
Galina Yu. Vitkina
Keyword(s):  
Thermal Conductivity ◽  
Mathematical Model ◽  
Blast Furnace ◽  
Thermal Properties ◽  
Thermal Conductivity Coefficient ◽  
Refractory Materials ◽  
Different Types ◽  
Definition Of ◽  
The Mathematical Model

In a laying of a hearth it is usually used to ten different types of the flameproof materials. The characteristics of materials declared by the manufacturer can differ from the actual. For creation of the mathematical model [1, 2] temperatures distributions in a laying of the concrete furnace it is necessary to know thermal conductivity of materials of the specific parties used at construction of the furnace. Definition of the thermal conductivity coefficient allows adapt mathematical model for specific conditions of use. The technique of determination of thermal properties of refractory materials on the temperatures acceleration curve at blowing-in of the blast furnace is described.

Determination of the thermal conductivity coefficient of inhomogeneous media

2014 ◽  
Author(s):  
S. A. Bochkareva ◽  
N. Yu. Grishaeva ◽  
P. A. Lyukshin ◽  
B. A. Lyukshin
Keyword(s):  
Thermal Conductivity ◽  
Thermal Conductivity Coefficient ◽  
Inhomogeneous Media

Calibration Method of Cool Box Used for Measuring of Thermal Conductivity Coefficient

2016 ◽  
Vol 861 ◽  
pp. 335-342
Author(s):  
Petr Kurečka ◽  
Jiří Teslík
Keyword(s):  
Thermal Conductivity ◽  
Temperature Difference ◽  
Building Materials ◽  
Measurement Accuracy ◽  
Thermal Conductivity Coefficient ◽  
Calibration Method ◽  
Box Method ◽  
Natural Building

One of the methods used for determining of the thermal conductivity coefficient value of building materials is the Calibrated and Guarded Hot Box method. This method is based on the principle of measuring the heat flux density that passes through the test specimen at a temperature difference between warm and cool parts of the measuring box. For measuring of thermal conductivity coefficient is at the Faculty of Civil Engineering of VŠB-TUO used the Cool Box. Measuring in Cool Box uses the same principle of measuring as Calibrated and Guarded Hot Box. For creating temperature difference during the measurements at the Cool Box is not used heat, but cold. Measurement of the thermal conductivity coefficient by a Cool Box is very complex in terms of measurement accuracy. That the resulting values as accurate as possible, it is necessary to calibrate itself refrigerated cabinets and all sensors that are used for measurements. This paper describes the principles of calibration of Cool Box and other components, which are used for measuring the thermal conductivity coefficient of selected natural building materials. Determination of the thermal insulation properties of selected materials is part of a long-term research focused on conventional and unconventional natural building materials.

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