TY - JOUR
T1 - Thermal conductivity of packed beds of refractory particles
T2 - Experimental results
AU - Fedina, Irina
AU - Litovsky, Efim
AU - Shapiro, Michael
AU - Shavit, Arthur
PY - 1997/8
Y1 - 1997/8
N2 - Experimental data on thermal conductivity of packed beds composed from various refractory particles (corundum, silica, magnesia, baddeleyite, yttrium oxide, spinel) obtained in the temperature range 400-2000 K in various gases are presented. It is found that thermal conductivity of a bed composed from crushed refractory particles may change after the first and subsequent heatings. This occurs as a result of smoothing of particle surfaces and decreasing of contact heat barrier resistances between the granules. The influence of smoothing is most significant for beds composed from particles with sizes below 2 mm. In polydisperse beds, containing micrometer-size particles, sintering processes were found to occur at temperatures above 1600 K. This led to a sharp increase of the bed thermal conductivity. In regimes where sintering did not take place, decreasing of particle size resulted in a decrease of the effective thermal conductivity. This is attributed to the increased number of contacts between the particles and the scattering of thermal radiation.
AB - Experimental data on thermal conductivity of packed beds composed from various refractory particles (corundum, silica, magnesia, baddeleyite, yttrium oxide, spinel) obtained in the temperature range 400-2000 K in various gases are presented. It is found that thermal conductivity of a bed composed from crushed refractory particles may change after the first and subsequent heatings. This occurs as a result of smoothing of particle surfaces and decreasing of contact heat barrier resistances between the granules. The influence of smoothing is most significant for beds composed from particles with sizes below 2 mm. In polydisperse beds, containing micrometer-size particles, sintering processes were found to occur at temperatures above 1600 K. This led to a sharp increase of the bed thermal conductivity. In regimes where sintering did not take place, decreasing of particle size resulted in a decrease of the effective thermal conductivity. This is attributed to the increased number of contacts between the particles and the scattering of thermal radiation.
UR - http://www.scopus.com/inward/record.url?scp=0031197277&partnerID=8YFLogxK
U2 - 10.1111/j.1151-2916.1997.tb03094.x
DO - 10.1111/j.1151-2916.1997.tb03094.x
M3 - 文章
AN - SCOPUS:0031197277
SN - 0002-7820
VL - 80
SP - 2100
EP - 2108
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 8
ER -