Theoretical and numerical characterization of the thermal conductivity of carbon ceramic material from realistic microscale imaging

Pavel V Prosuntsov,Nikita Y Taraskin,G.V Kuznetsov,A.O Zhdanova,P.A Strizhak

doi:10.1051/matecconf/20179201008

Abstract

The paper is concerned with the theoretical and numerical characterization of the thermal conductivity of porous carbon ceramic materials. The material structure models are created based on 3D computer tomography (CT) images. The temperature functions of the molecular and effective thermal conductivity for the porous carbon-ceramic material were obtained. It was investigated, whether a simplified model could be used to estimate the thermal conductivity. The thermal conductivity data obtained with the computer tomography method and with the proposed simplified model are compared.

Highlights

The paper is concerned with the theoretical and numerical characterization of the thermal conductivity of porous carbon ceramic materials
Despite this ceramic composite materials (CCCM) cannot be employed as the mass efficient thermal protection due to their high density and high thermal conductivity (up to 60 W/(m∙K)) [2]
The conductive heat transfer is described by means of the molecular thermal conductivity coefficient [5]

Summary

Introduction

The paper is concerned with the theoretical and numerical characterization of the thermal conductivity of porous carbon ceramic materials. Experiments to estimate the thermal conductivity coefficient of such high-temperature CCCM are highly challenging. The experiments can determine only the so-called effective thermal conductivity coefficient, which estimates the total heat transfer including both conductive heat transfer along the reinforcement and radiative heat transfer in the pores.

Results

Conclusion