Experimental investigation of particle–droplet–substrate interaction

Abstract The impact of droplets on non-fixed spherical particles placed a plane polymethyl methacrylate (PMMA) substrate is investigated. This interaction highly abstracted level high-pressure spray cleaning process. Water in diameter range between 0.68 and $$1.66\,{\mathrm{mm}}$$ 1.66 mm with 1.55 mm are used. droplet velocity $$1.05 \le v_{\mathrm{d}} 2.0\,{\mathrm{m/s}}$$ 1.05 ≤ v d 2.0 m / s results Weber number $$13\,\le \,{\mathrm{We}}\,\le \,94$$ 13 We 94 . particle-droplet-substrate interactions investigated for different numbers, droplet-to-particle ratios eccentricities. Different scenarios identified: A—Lift-off during initial recoil; B—Lift-off later C—No Lift-off, deposition the D—No wetting substrate. behavior determined depending particle-to-droplet diameter. Additionally, analysis eccentricity relation to lift-off shows that height duration increases centrality. investigation temporal change half-spread contact angle criterion point time at which takes place. Finally, simplified analytical model provided quantifying probability particle-droplet system after interaction. Experimental used create map occurring regimes terms configuration.