Experimental Characterization of Sprays in a Recessed Gas-Centered Swirl Coaxial Atomizer

Joseph, A and Sakthikumar, R and Sivakumar, D (2020) Experimental Characterization of Sprays in a Recessed Gas-Centered Swirl Coaxial Atomizer. In: Journal of Fluids Engineering, Transactions of the ASME, 142 (4).

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Abstract

The characteristics of sprays from a recessed gas-centered swirl coaxial atomizer (RGCSCA) with gas to liquid momentum flux ratio, J of the spray in the range of 2-66 are studied experimentally through the analysis of spray morphologies and droplets characteristics. The process of fully developed spray (spray free from ligaments/droplets clusters and nonspherical droplets) in the atomizer is quantified. In the RGCSCA, the distance from the atomizer exit to the fully developed spray zone decreases with increase in J. Detailed measurements of size (in the range of 6-378 μm) and velocity (in the range of 35-176 m/s) characteristics of spray droplets are carried out using phase Doppler interferometry (PDI) in the fully developed spray. The spray from the RGCSCA is comprised of two distinct spray morphologies: A central dense spray of finer droplets and an outer coarse spray. The mean drop size of the central spray exhibits a decreasing trend with the increase in J whereas that of the outer coarse spray is independent of J. The radial profiles of the mean velocities of sprays at different J are presented. For the sprays with low inertia liquid sheets, the shape of mean axial velocity profiles is Gaussian. © 2020 American Society of Mechanical Engineers (ASME). All rights reserved.

Item Type:	Journal Article
Publication:	Journal of Fluids Engineering, Transactions of the ASME
Publisher:	American Society of Mechanical Engineers (ASME)
Additional Information:	The copyright for this article belongs to American Society of Mechanical Engineers (ASME)
Keywords:	Flow interactions; Fluid dynamics, Axial velocity; Coaxial atomizers; Experimental characterization; Gas to liquids; Mean velocities; Measurements of; Phase doppler interferometries; Radial profiles, Drops
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	12 Aug 2021 11:11
Last Modified:	12 Aug 2021 11:11
URI:	http://eprints.iisc.ac.in/id/eprint/69221

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