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Atomization and Sprays

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ISSN Print: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v13.i1.20
17 pages

OPTICAL PATTERNATION OF A WATER SPRAY USING STATISTICAL EXTINCTION TOMOGRAPHY

Jongmook Lim
En'Urga Inc., 1291-A Cumberland Avenue, West Lafayette, IN 47906, USA
Yudaya R. Sivathanu
En'Urga Inc.; Maurice J. Zucrow Laboratories (Formerly Thermal Sciences and Propulsion Center), School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, U.S.A.
Vinoo Narayanan
En'Urga Inc., West Lafayette, Indiana, USA
Seungmin Chang
En'Urga Inc., West Lafayette, Indiana, USA

ABSTRACT

Tomographic reconstruction of local liquid surface areas per unit volume in a turbulent spray using path-integrated laser transmittance measurements is reported. Path-integrated transmittances from a turbulent spray were obtained using a newly developed six-axes optical patternator. A multiaxis maximum-likelihood estimation algorithm was developed to deconvolute for the local extinction coefficients from the path-integrated transmittances. The local extinction coefficients are identical to the local liquid surface area per un it volume within the spray. The algorithm was first evaluated using synthetic path-integrated data. The algorithm successfully recovered the local extinction coefficients from the synthetic path-integrated transmittances. The algorithm was then used to obtain local liquid surface areas per unit volume from the path-integrated transmittance measurements in the spray. The path-integrated extinction measurements were also compared with mass flux data obtained using a mechanical pattemator. The results suggest that the local velocity and size distribution of the spray field is highly correlated with the local surface area density in sprays.