Effect of radiative heat transfer on the coagulation dynamics of combustion-generated particles

Journal Article · Sat Jan 01 00:00:00 EST 1994 · Aerosol Science and Technology; (United States)

DOI:https://doi.org/10.1080/02786829408959666· OSTI ID:5111995

Mackowski, D W ^[1]; Tassopoulos, M; Rosner, D E ^[2]

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1. Auburn Univ., AL (United States)
2. Yale Univ., New Haven, CT (United States)

We examine the influences of radiation heat transfer on the size and number density evolution of small coagulating particles. On a microscopic level, radiative emission and/or absorption by the particle will perturb the gas temperature field adjacent to each particle. As a result of thermophoretic particle transport, the nonequilibrium condition can alter the collision rates with neighboring particles. A simplified analysis of the thermophoretic coagulation mechanism suggests that net radiative cooling of the particles can lead to an accelerated growth of [mu]m-sized particles, whereas net radiative heating can act to essentially freeze coagulation rates. On the macroscopic level, the addition or removal of heat in the gas through radiative absorption emission by the particle cloud can also significantly alter, through thermophoretic transport, the local particle number density. Under certain cases these effects can augment the accelerated coagulation rates that occur under radiative cooling conditions. We also examine the particular situation of equilibrium between particle cloud radiative absorption and emission - which results in no net macroscopic effect on the gas. 30 refs., 9 figs.

• OSTI ID: 5111995
• Journal Information: Aerosol Science and Technology; (United States), Vol. 20:1; ISSN 0278-6826
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
AEROSOLS
COOLING
FLOCCULATION
RADIANT HEAT TRANSFER
COMBUSTION PRODUCTS
PARTICULATES
MATHEMATICAL MODELS
COLLOIDS
DISPERSIONS
ENERGY TRANSFER
HEAT TRANSFER
PARTICLES
PRECIPITATION
SEPARATION PROCESSES
SOLS
421000* - Engineering- Combustion Systems
420400 - Engineering- Heat Transfer & Fluid Flow
990200 - Mathematics & Computers