Light scattering based particle sizing techniques have the advantage of nonintrusively measuring sizes of emulsions and dispersions. Depending on the parameters involved, there are several techniques that can be used and a choice of the most convenient method can be made. When the particles are large, Fraunhofer Diffraction Pattern Analysis (FDPA) can be employed in measuring particle-sizing distributions. The design of a high quality diesel engine would involve an understanding of the disintegration mechanism, spray penetration, and spray motion. It is the objective of this paper to implement the FDPA laser diffraction method to determine spray penetration and droplet mean diameters, for single injection of diesel fuel with synchronized time that will allow time dependent studies.

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