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Liquid Spray Morphological Information from Laser-Diffraction Measurements


The Laser-Diffraction Technique (LDT) based on the analysis of the light diffraction pattern forwardly scattered by droplets going through a laser optical probe, reports a drop-diameter distribution of a set of spherical drops that would scatter the same diffraction pattern as the one recorded. However, a light diffraction pattern depends on the shape of the scattering drops. Thus, LDT measures an equivalent diameter distribution that depends on the shape of the drops but the relationship between the equivalent diameter and the actual particle shape is unknown. The experimental investigation presented in this paper addresses this point. The approach consists in measuring liquid spray characteristics with a LDT instrument and an Image Analyzing Technique (IAT). This technique measures the projected area diameter distribution as well as the scale-distribution of the liquid sprays, the latter being explicitly a function of the shape of the drops. All experimental precautions are taken to validate the protocol. The results clearly evidence an influence of drop shape of LDT distribution. The analysis and comparison of the measurements demonstrate that the mean-diameter series of the LDT equivalent-diameter distribution contains information on the drop shapes. Although this result has not been fully explained, it is believed that this performance demonstrates that LDT provides a multi-scale description of the spray droplets. This point is supported by the fact that scaledistribution of the LDT diameter-distribution is very similar to the actual spray scale-distribution inducing the idea that LDT measurement conserves the spray surface-based scale-distribution. These results evidence LDT potentialities that have not been explored so far.
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Dates and versions

hal-03991830 , version 1 (16-02-2023)


  • HAL Id : hal-03991830 , version 1


Christophe Dumouchel, S. Grout, B. Leroux, X. Paubel. Liquid Spray Morphological Information from Laser-Diffraction Measurements. ICLASS 2009, Jul 2009, Vail, United States. ⟨hal-03991830⟩
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