Thermal conductivity of refractory fills at temperatures in the range 500?2000 K

Dul'nev, G. N.; Litovskii, E. Ya.; Fedina, I. G.; Bondarenko, S. L.

doi:10.1007/bf00870467

Cited by 1 publication

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“…Experiments described in Ref. 23 show that particles in packed beds heated above 1500 K continued to maintain their fluidity and suggest that no sintering occurred. It should be noted, however, that the time effects on thermophysical properties could change, in some cases, under prolonged use at temperatures even below 1500 K. 23,29 In this paper, experimental data on and a of packed beds containing refractory oxides (Al 2 O 3 , MgO, Y 2 O 3 , ZrO 2 , etc.…”

Section: Introductionmentioning

confidence: 98%

“…This general result has been confirmed by numerous experimental data for beds composed from various inorganic materials, irrespective of the thermal conductivity of the solid phase. 1,5, 23 Thermophysical properties of packed refractory beds for higher temperatures (above 1500 K) have not yet been studied. This paper presents experimental data on thermal conductivity and thermal diffusivity of packed refractory beds, collected over a wide temperature range.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Conductivity of Packed Beds of Refractory Particles: Experimental Results

Fedina

Litovsky

Shapiro

et al. 1997

Journal of the American Ceramic Society

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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.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%