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Droplet sizes and velocities in vaporizing sprays☆

1983; Elsevier BV; Volume: 54; Issue: 1-3 Linguagem: Inglês

10.1016/0010-2180(83)90018-4

1556-2921

AJ Yule, Peter R. Ereaut, A. Üngüt,

Aerosol Filtration and Electrostatic Precipitation

A pulse height laser Doppler anemometer particle sizing technique has been refined to permit simultaneous particle size and velocity measurements in sprays. The improvements include (i) the use of a specially tailored “top hat” light distribution, to provide unambiguous particle diameter-signal amplitude relations, (ii) the use of back scattered light collection, and (iii) the utilization of Mie theory to compute the relations between signal amplitude and particle diameter, in the backscatter mode. Twin-fluid atomized kerosene sprays have been investigated using the new technique. In these sprays distributions have been mapped of mean droplet diameters, droplet size distributions, and the local correlations between droplet diameters and velocities. The data show the variation of spray structure with atomizer input parameters, the preferential vaporization of smaller droplets, and the differing trajectories of the large and small droplets.