caa a22 4500 477093043 CHVBK 20180405111520.0 cr unu---uuuuu 170330e19960101xx s 000 0 eng 10.1007/BF00190271 doi (NATIONALLICENCE)springer-10.1007/BF00190271 Droplet motion in an electrohydrodynamic fine spray [Elektronische Daten] [J. Grace, P. Dunn] The results of a combined experimental and numerical study on droplet behavior within an electrohydrodynamic fine spray are presented. The fine spray exists in the transition region between the multiple cone-jet and rim emission spray modes. Experiments were conducted specifically to characterize the motion of droplets within the spray. Light-sheet visualizations and measurements of droplet speed and velocity using laser-based, single-particle counters were obtained. Additionally, a numerical simulation of the droplet motion within the spray was made and compared to the experimental results. The electrohydrodynamic fine spray of ethanol droplets (∼ 1 to 40 μm diameter) was generated using a typical capillary-plate configuration, with a capillary tip electric field intensity of ∼ 106 V/m and a spray charge density of ∼70 C/m3. Acquired images of the spray revealed a zone of rapid expansion near the capillary followed by a more gradual expansion farther from the capillary. In situ laser-diagnostic measurements confirmed these observations. Measured droplet speeds decreased rapidly with increasing axial distance from the capillary, but then increased beyond the spray's axial mid-plane as a result of a change in the sign of the axial internal electric field. Droplet axial velocity components behaved similarly. The radial velocity components exhibited a maximum value off of the spray's centerline in the near-capillary region. Farther away from the capillary, they increased monotonically with increasing radial position. These trends identified the significant role that the radial internal electric field plays in spray expansion. The numerical simulation of the normal spray verified the inferred change in sign of the axial internal field and underscored the dominant contribution of the external electric field in the near-capillary region and of the internal electric field farther away. Springer-Verlag, 1996 Grace J. Particle Dynamics Laboratory, Hessert Center for Aerospace Research, Department of Aerospace & Mechanical Engineering, University of Notre Dame, 46556, Notre Dame, IN, USA aut Dunn P. Particle Dynamics Laboratory, Hessert Center for Aerospace Research, Department of Aerospace & Mechanical Engineering, University of Notre Dame, 46556, Notre Dame, IN, USA aut Experiments in Fluids Springer-Verlag 20/3(1996-01-01), 153-164 0723-4864 20:3<153 1996 20 348 https://doi.org/10.1007/BF00190271 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00190271 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grace J. Particle Dynamics Laboratory, Hessert Center for Aerospace Research, Department of Aerospace & Mechanical Engineering, University of Notre Dame, 46556, Notre Dame, IN, USA aut NATIONALLICENCE 700 1- Dunn P. Particle Dynamics Laboratory, Hessert Center for Aerospace Research, Department of Aerospace & Mechanical Engineering, University of Notre Dame, 46556, Notre Dame, IN, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer-Verlag 20/3(1996-01-01), 153-164 0723-4864 20:3<153 1996 20 348 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer