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Magnetic Resonance Imaging measurements of a water spray upstream and downstream of a spray nozzle exit orifice.
- Source :
-
Journal of Magnetic Resonance . May2016, Vol. 266, p8-15. 8p. - Publication Year :
- 2016
-
Abstract
- Sprays are dynamic collections of droplets dispersed in a gas, with many industrial and agricultural applications. Quantitative characterization is essential for understanding processes of spray formation and dynamics. There exists a wide range of measurement techniques to characterize sprays, from direct imaging to phase Doppler interferometry to X-rays, which provide detailed information on spray characteristics in the “far-nozzle” region (≫10 diameters of the nozzle). However, traditional methods are limited in their ability to characterize the “near-nozzle” region where the fluid may be inside the nozzle, optically dense, or incompletely atomized. Magnetic Resonance Imaging (MRI) presents potential as a non-invasive technique that is capable of measuring optically inaccessible fluid in a quantitative fashion. In this work, MRI measurements of the spray generated by ceramic flat-fan nozzles were performed. A wide range of flow speeds in the system (0.2 to >25 m/s) necessitated short encoding times. A 3D Conical SPRITE and motion-sensitized 3D Conical SPRITE were employed. The signal from water inside the nozzle was well-characterized, both via proton density and velocity measurements. The signal outside the nozzle, in the near-nozzle region, was detectable, corresponding to the expected flat-fan spray pattern up to 3 mm away. The results demonstrate the potential of MRI for measuring spray characteristics in areas inaccessible by other methods. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10907807
- Volume :
- 266
- Database :
- Academic Search Index
- Journal :
- Journal of Magnetic Resonance
- Publication Type :
- Academic Journal
- Accession number :
- 114845196
- Full Text :
- https://doi.org/10.1016/j.jmr.2016.03.005