Energy transfer between an aerosol particle and gas at high temperature ratios in the Knudsen transition regime

• Published in: International journal of heat and mass transfer Vol. 43; no. 1; pp. 127 - 138
• Main Authors: Filippov, A.V., Rosner, D.E.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.01.2000; Elsevier
• Subjects: Aerosols; Chemistry; Colloidal state and disperse state; Computer simulation; Equations of motion; Exact sciences and technology; General and physical chemistry; General, apparatus, technics of preparation; Interpolation; Mathematical models; Monte Carlo methods; Particles (particulate matter); Transition flow; Characterization; Monte Carlo method; Superheating; Measurement by laser beam; Aerosols; Numerical simulation; Particle size measurement; Spherical particle; Kinetic theory; Incandescence; Heat transfer; Submicron particle
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/S0017-9310(99)00113-1

Motivated by the Laser-Induced Incandescence (LII) technique for in situ sizing of submicron aerosols, non-continuum heat transfer between an isolated, motionless, highly overheated spherical particle and its cooler surrounding gas is studied using the Direct Monte Carlo Simulation (DSMC) technique for the ‘calibration’ case of a monatomic, hard-sphere gas. We find that our numerical DSMC results are adequately described by a variable property extension of Fuchs’ two-layer theory, whereas other interpolation formulae fail in the Knudsen transition regime when the particle/gas temperature ratio is large. On this basis, tractable equations are provided which will permit accurate estimates of the transition regime heat transfer coefficient for a polyatomic ideal gas with arbitrary temperature-dependent heat capacity and Fourier conductivity.