Heat Transfer Characterization of Block Type Variable Porosity Foam Ceramics
To investigate the heat transfer characteristics of block-type variable porosity foam ceramics,the steady-state plane heat source method was employed.This study analyzed the influence of heat source temperature on the contact thermal resistance of block-type foam ceramics,based on which the effects of pore density gradient,thickness gradient and average pore size on the effective thermal conductivity of block-type foam ce-ramic were explored.It was found that the contact thermal resistance of block-type foam ceramics decreases as the heat source temperature increases,with the maximum decrease reaching 10.2%.Moreover,when the pore density gradient aligns with the direction of heat flow,the effective thermal conductivity of block-type foam ceramics increases with the average pore diameter.Under a constant average pore diameter,the block-type foam ceramics in the heat flow direction,with a decreasing pore density gradient and an increasing thickness,has the highest effec-tive thermal conductivity.Compared to the impact of changes in pore density gradient,variations in the average pore diameter exert a relatively small effect on the effective thermal conductivity of block-type foam ceramics.
foam ceramicsthermal conductivityaverage pore sizepore density
万方数据
维普
