Further development of temperature determination for a heated micron-sized particle from forced convection

Bin Zhao, Ezra Bar-Ziv

    Research output: Contribution to journalArticlepeer-review

    3 Scopus citations

    Abstract

    A novel method for determining temperature of a micron-sized particle from forced convective force has been developed. The force was measured for a single suspended particle in an electrodynamic chamber. Particle heating was achieved by focused CO2 laser radiation. With negligible free convection, a correlation was formulated between the forced convective force and temperature-dependent viscosity of the gas, on the basis of the Stokes expression. According to this correlation, the ratio of hot to cold forced convective forces on a particle depends on the gas viscosity, and the particle temperature can be attained from this ratio. Particle temperature was determined for a non-reacting glassy carbon particle of 100μm and a pyrolyzing polystyrene particle of 157μm. It was shown that the developed method is straightforward and quite accurate with an uncertainty of less than 2.5%, and applicable to both reacting and non-reacting particles.

    Original languageEnglish
    Pages (from-to)165-180
    Number of pages16
    JournalJournal of Aerosol Science
    Volume33
    Issue number1
    DOIs
    StatePublished - 1 Jan 2002

    Keywords

    • Electric levitation
    • Electrodynamic chamber
    • Forced convection
    • Pyrolysis
    • Stokes regime
    • Temperature determination

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