A new method for measuring the heat conduction coefficient of thin ceramic layers at high temperatures

1983 ◽  
Vol 26 (11) ◽  
pp. 1603-1610
Author(s):  
Wiktor Żyszkowski
Keyword(s):  
Heat Conduction ◽  
High Temperatures ◽  
New Method ◽  
Heat Conduction Coefficient

Preparation and Properties of Lightweight, High-Strength Insulation Materials Using Fly Ash Floating Beads

2016 ◽  
Vol 697 ◽  
pp. 599-603
Author(s):  
Ya Peng Dai ◽  
Xing Yong Gu ◽  
Wei Xia Dong ◽  
Ting Luo
Keyword(s):  
Compressive Strength ◽  
Heat Conduction ◽  
Fly Ash ◽  
High Strength ◽  
Volume Density ◽  
Particle Sizes ◽  
Heat Conduction Coefficient ◽  
Insulation Materials ◽  
Test Instrument ◽  
Save Energy

In our paper, to save energy conservation and environmental protection, and in view of waste fly ash floating bead with excellent properties such as light and refractory, lightweight insulation materials was prepared using fly ash floating beads as the main materials. Firstly, two different fly ash floating bead contents on the properties of the light and refractory material were investigated. Then, on the basis of the optimum fly ash floating bead content, effects of various different particle sizes and firing temperature on the bulk density, compressive strength and the heat conduction coefficients of the samples were studied. The microstructure of the light-weight refractory materials was characterized by XRD and SEM. The heat conduction coefficient (λ') of the samples were also measured by the self-made test instrument. The experimental results showed that the properties of the as-prepared sample using 80% fly ash floating beads was superior to that of 95 % fly ash floating beads. The optimal volume density of 0.60-1.04 g/cm3, compressive strength of 10.6-39.5 MPa and the heat conduction coefficient of 0.183-0.25 °C·g/ min·cm2 were achieved in the presence of 80% fly ash floating beads with 120-160 particle size at 1200°C-1300°C, which has the potential application in lightweight insulation materials.

A new method for studying the degradation of polymers at high temperatures

1998 ◽  
Vol 27 (2) ◽  
pp. 2865-2871 ◽  
Author(s):  
Bin Zhao ◽  
Isaac Kantorovich ◽  
Ezra Bar-Ziv
Keyword(s):  
High Temperatures ◽  
New Method

scholarly journals Non-linear unsteady inverse boundary problem for heat conduction equation

2017 ◽  
Vol 38 (2) ◽  
pp. 81-100 ◽  
Author(s):  
Magda Joachimiak ◽  
Michał Ciałkowski
Keyword(s):  
Heat Conduction ◽  
Heat Conduction Equation ◽  
Linear Problem ◽  
Conduction Equation ◽  
Direct And Inverse Problems ◽  
Heat Conduction Coefficient ◽  
Nitrification Process ◽  
Non Linear ◽  
Unsteady Heat Conduction ◽  
Inverse Boundary Problem

AbstractDirect and inverse problems for unsteady heat conduction equation for a cylinder were solved in this paper. Changes of heat conduction coefficient and specific heat depending on the temperature were taken into consideration. To solve the non-linear problem, the Kirchhoff’s substitution was applied. Solution was written as a linear combination of Chebyshev polynomials. Sensitivity of the solution to the inverse problem with respect to the error in temperature measurement and thermocouple installation error was analysed. Temperature distribution on the boundary of the cylinder, being the numerical example presented in the paper, is similar to that obtained during heating in the nitrification process.

A Predicting Method for Thermal Conductivity of Functional Carbide Crystals and Ceramic Materials

2007 ◽  
Vol 280-283 ◽  
pp. 1175-1178
Author(s):  
Qing Ren Wu ◽  
Xiao Ping Wang ◽  
Hua Qing Xie ◽  
Tonggeng Xi
Keyword(s):  
Thermal Conductivity ◽  
Heat Conduction ◽  
Relative Error ◽  
Ceramic Materials ◽  
Prediction Equation ◽  
Atomic Mass ◽  
New Method ◽  
Relative Atomic Mass ◽  
Thermal Conductivities

A new method for predicting the thermal conductivity of functional carbide crystals and ceramics materials is proposed. The effect of average relative atomic mass and density on thermal conductivities of carbide function crystals and ceramics is considered in the method. Correlations are developed for thermal conductivity with average relative atomic mass and density according to the microscope theories of heat conduction. The thermal conductivities calculated from the prediction equation for many functional carbide crystals and ceramics were compared with the measured dada and found to be agreement. It is show that, for the most of functional carbide crystals and ceramics materials, the relative error between the predicting values and the measuring data is ± 20%. It is discovered in further analysis that the larger the average relative atomic mass and density are, the more accurately the thermal conductivities predict.

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