scholarly journals Measurement of Thermal Diffusion Coefficient of High Thermal Con-ductivity Pellets by Laser Scattering Method

2019 ◽  
Vol 3 (1) ◽  
pp. 14-17
Author(s):  
Haipeng Wang ◽  
Keyword(s):  
Thermal Conductivity ◽  
Diffusion Coefficient ◽  
Thermal Diffusion ◽  
High Efficiency ◽  
High Thermal Conductivity ◽  
Flash Method ◽  
Scattering Method ◽  
Laser Scattering ◽  
Thermal Diffusion Coefficient ◽  
Main Research

UO2-BeO high thermal conductivity pellets have the characteristics of high thermal conductivity, high efficiency, long cycle and low recovery cost compared with traditional nuclear fuel. In this paper, the thermal diffusion coefficient of UO2-BeO pellets is characterized by laser flash method, in which the selection and optimization of test parameters are the main research part.

scholarly journals ANALYSIS OF THE THERMOPHYSICAL PROPERTIES AND INFLUENCING FACTORS OF VARIOUS ROCK TYPES FROM THE GUIZHOU PROVINCE

2018 ◽  
Vol 53 ◽  
pp. 03059 ◽  
Author(s):  
Song Xiaoqing ◽  
Jiang Ming ◽  
Xiong Peiwen
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Diffusion Coefficient ◽  
Specific Heat ◽  
Thermal Diffusion ◽  
Specific Heat Capacity ◽  
Thermophysical Properties ◽  
Guizhou Province ◽  
Thermal Diffusion Coefficient ◽  
Rock Types

A series of analyses have been carried out on a number of rock types from the Guizhou Province to investigate their thermophysical properties. A total of 433 samples from 14 types of rock were collected, tested and analyzed. It was found that in this province, the average thermal conductivity of the samples ranged between 1.516±0.264 and 5.066±0.521 W/(m·K), the average specific heat capacity varied from 0.272±0.042 to 0.603±0.096 kJ/(kg·°C), and the average thermal diffusion coefficients were from 0.752±0.331 to 2.854±0.368 MJ/(m3·K). The older rocks always had higher thermal conductivity and thermal diffusion. Thermal conductivity and thermal diffusion of rocks are positively correlated with the mineral content of high thermal conductivity species, but the situation for the specific heat capacity is the opposite. With increasing mineral particle size, the thermal conductivity and thermal diffusion coefficient also increase, but the relationship with specific heat capacity is not obvious. The thermal conductivity and thermal diffusion coefficient of rocks increases under water saturated conditions compared to dry conditions, but the specific heat capacity decreases.

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