Engineering Mechanics

Proceedings Vol. 21 (2015)

ENGINEERING MECHANICS 2015

Copyright © 2015 Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague

 

M. Mlkvik, M. Zaremba, P. Stähle, H.P. Schuchmann, V. Gaukel, J. Jedelsky
pages 204 - 205, full text

Main goal of this study is to relate the measured droplet sizes, characterized by the Sauter mean diameter (ID32), to the conditions of the primary breakup defined mainly by the Weber number (We). To compare different atomizing techniques, we investigated four twin-fluid atomizers with different mechanisms of internal mixing: Y-jet atomizer, outside in gas (OIG) and outside in liquid (OIL) effervescent atomizers and in-house invented CFT atomizer. Our results shows, that for the OIL, OIG and CFT atomizer a common relation between the working parameters (pressure drop- !p, gas to liquid ratio- GLR) and measured droplets sizes, normalized regarding to the critical Weber Number (Wecrit) in the primary breakup area, is found Increasing trend of the normalized droplet diameter with increasing GLR and !p indicates the decreasing efficiency of atomization process, which is in accordance with current knowledge of energy conversion in twin fluid atomizers. The Y- jet atomizer shows a different trend which is related to the considerably lower We at primary breakup site.

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All papers were reviewed by members of the scientific committee.