Physics – Fluid Dynamics
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dfd.ka008s&link_type=abstract
American Physical Society, Division of Fluid Dynamics 56th Annual Meeting, November 23-25, 2003, East Rutherford, New Jersey, ME
Physics
Fluid Dynamics
Scientific paper
Increased transfer efficiency in spray coating processes can minimize the cost of raw materials; reduce environmental pollution and minimize health hazards. The transfer efficiency (i.e. mass fraction of product that actually deposits on the target) of small spray droplets is influenced by the local turbulence present at the target, which is passively controlled in this study by using nozzles of indeterminate origin (IO). The structure and flow field of round water jets (single phase and particle-laden) are studied with Particle Image Velocimetry (PIV). Typical jet Reynolds numbers (based on the nozzle diameter) are 10,000. The jet structures for IO nozzles are compared to those in conventional round nozzles. The IO nozzles introduce strong streamwise vortex pairs, which influence the near-jet structure and spreading by deforming the vortex rings. The vortex pairs generated by the peaks of the IO nozzle cause the jet flow intrude into ambient flow, while the vortex pairs generated by the valleys of the IO nozzle entrain ambient fluid into the jet. The evolution of these effects with streamwise distance and their implications will be discussed.
Plesniak Michael W.
Shu Fangjun
Sojka Paul E.
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