A cell model that estimates radiative heat transfer in a nonscattering, particle-laden flow
- Lab. d'Aerothermique du C.N.R.S., Meudon (France)
Radiation heat transfer is very important in two-phase, gas-solid, high-temperature flows. However, in most cases this form of heat transfer is neglected because the problem is very complex. For example, when spherical black particles are being transported by a transparent gas inside a cylindrical tube, even if the exact location of each particle were known, one would be forced to solve a heat transfer equation for every pair of particles. In the analysis presented here, the author considers a particle, labeled A, in the middle of a cloud and develop a theory to estimate the distance from A that is necessary for other particles to absorb the radiation leaving A. The author assumes that the particles are all of the same size and that they are uniformly distributed in the reactor cross-sectional area; poroisity gradients are neglected. From this theory, one can separate a reactor into two zones: a first zone near the walls where thermal radiation leaving the walls can be captured by the particles in it; and a second zone nearer the reactor center where particle-to-particle radiation heat transfer is predominant. The theory is compared to results obtained using the continuum assumption.
- OSTI ID:
- 5344908
- Journal Information:
- Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States), Vol. 109:1; ISSN 0022-1481
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
RADIANT HEAT TRANSFER
MATHEMATICAL MODELS
TWO-PHASE FLOW
COAL
COMBUSTION
FLAMES
FUEL PARTICLES
PACKED BED
SOOT
WALLS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
ENERGY SOURCES
ENERGY TRANSFER
FLUID FLOW
FOSSIL FUELS
FUELS
HEAT TRANSFER
MATERIALS
OXIDATION
THERMOCHEMICAL PROCESSES
420400* - Engineering- Heat Transfer & Fluid Flow