Abstract
Liquid sheet breakup of a prefilming and nonprefilming airblast atomizer is investigated experimentally at ambient temperatures and elevated pressures of air. The breakup is studied by high-speed flow visualization. The visualizations show the differences between both types of atomizers. For lower liquid loadings, the atomizer edge is always wetted in the prefilming case, whereas dry zones are observed for the nonprefilming injector. Different atomization regimes are observed for rising Weber numbers on the prefilmer: wavy sheet breakup below We = 100, surface stripping above 380, and a transition zone in between. The nonprefilming case always exhibits wavy sheet breakup, provided there is a sheet at the outlet, with the breakup length reducing to 0.5 mm above We 100. Liquid sheet thickness is characterized with side view images. Films that are thin compared to the edge thickness and are not composed of ligaments at the edge, wrap around the edge and therefore exhibit a storage mechanism. In the far field, drop sizes are characterized with a global Sauter mean diameter measured by phase Doppler anemometry. The measured drop sizes, influenced by primary and secondary atomization, show only small differences between the two types of atomizers. Correlations for the final drop size are obtained for both atomizer types for the conditions investigated.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
