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b Shanghai Engineering Research Center of Space Engine, Shanghai Institute of Space Propulsion, Shanghai, 201112, China
• Formation and evolution of granular sheet generated by granular jet impingement.
• Circumferential distribution of granular sheet concentration is trimodal pattern.
• Core region with low velocity extends along horizontal and vertical directions.
Particle motion regime and enrichment behavior of dense granular impinging-jets formed by the nozzle with rectangular orifice are experimentally and numerically investigated. Two impingement patterns are identified, including long and short parallel patterns. Particles enrich in the central axis of the granular sheet when two jets impinge with the long axes parallel pattern. While at the short axes parallel pattern, particles generate two symmetrical enriched streams. The angle of particle-enriched streams is observed to increase with increasing angle of two impinging-jets and decreasing aspect ratio of the nozzle orifice. The particle image velocity (PIV) analysis results demonstrate that the circumferential distribution of the particle velocity on the granular sheet follows the Gaussian distribution. With the formation of particle-enriched streams, the concentration distribution of the particle evolves into a trimodal pattern. Results of the discrete element method (DEM) indicate that the core region with low velocity within the impact zone of impinging-jets generated by using two nozzles with rectangular orifices extends into a shuttle shape. The core region develops and extends along the horizontal (or vertical) directions at long (or short) axes impingement pattern, thereby, affecting the enrichment behavior of particles.
