Wärmestrahlung in dispersen Feststoffsystemen

Abstract

Heat radiation in packed solids. The term packed solids embraces fixed beds and all other, sometimes less rigidly fixed, arrangements of solids particles of any shape in a gaseous environment. Cell and quasihomogeneous models have been developed for determining heat radiation in such systems and their predictions compared with one another and especially with available experimental data. Since fixed beds of spherical particles have been considered most frequently so far, they receive the greatest attention in this article. Topics such as radiation components in insulation systems, in chemical fixed bed reactors, in porous particles, and the effect of radiation on the wall heat transfer coefficient are mentioned only briefly.

Full-field modeling of heat transfer in asteroid regolith 2: Effects of porosity

“…The radiative exchange factor, F, serves to bridge the gap between this approximation and the bed of particles that constitutes a regolith. Many have sought to define the radiation exchange factor or sought other novel methods to approximate or directly model heat transfer in packed beds of spheres, especially in literature related to pebble bed nuclear reactors (van Antwerpen et al, 2010;de Beer et al, 2018;Calderón-Vásquez et al, 2021) and other industrial applications (Vortmeyer, 1979;Tausendschön and Radl, 2021). However, many of these studies have only considered packings across a narrow range of porosity values (e.g., ~0.4-0.5), which are in general too narrow for planetary science applications.…”

Full‐Field Modeling of Heat Transfer in Asteroid Regolith: 2. Effects of Porosity

“…The radiative exchange factor, F , serves to bridge the gap between this approximation and the bed of particles that constitutes a regolith. Many have sought to define the radiation exchange factor or sought other novel methods to approximate or directly model heat transfer in packed beds of spheres, especially in literature related to pebble bed nuclear reactors (Calderón‐Vásquez et al., 2021; De Beer et al., 2018; van Antwerpen et al., 2010) and other industrial applications (Tausendschön & Radl, 2021; Vortmeyer, 1979). However, many of these studies have only considered packings across a narrow range of porosity values (e.g., ∼0.4 to 0.5), which are in general too narrow for planetary science applications.…”