(151b) Non-Intrusive Dynamics during Spray Flame Synthesis of Zro2
AIChE Spring Meeting and Global Congress on Process Safety
2006
2006 Spring Meeting & 2nd Global Congress on Process Safety
Fifth World Congress on Particle Technology
Characterization of Particles Made by Flame Synthesis
Tuesday, April 25, 2006 - 4:50pm to 5:10pm
Droplet and particle dynamics are studied in situ and non-intrusively in a particle-laden spray flame producing 15 g/h zirconia using 2D-Phase Doppler Anemometey (PDA), Fourier transform infrared (FTIR) emission/transmission spectroscopy and small angle x-ray scattering (SAXS). Droplet velocities are measured by PDA and droplets smaller than 4 ?Ým are used to estimate the flame gas velocity. Gas temperature is measured in the particle-laden spray flame by FTIR emission/transmission spectroscopy. SAXS is used to measure simultaneously the evolution of primary-particle diameter, mass-fractal dimension, geometric standard deviation, particle volume fraction, particle number concentration, agglomerate size and number of primary particles per agglomerate of zirconia in the spray flame. For SAXS, a third-generation synchrotron source is used where nano- to microscales measurement were possible. PDA, FTIR and SAXS measurements are coupled to study particle growth as function of time in a defined temperature and velocity profile.
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