Influence of drop spacing on burning of an emulsified-drop stream

Y. Y. Lin, C. K. Chen, T. H. Lin

Research output: Contribution to conferencePaperpeer-review

Abstract

Combustion characteristics of water-in-dodecane emulsion drops with various initial spacings were studied experimentally by using a free-falling drop burning apparatus. The initial drop spacings (Si) were 2.5, 5, 10, 40, 75 (70), 100. Si(s/di) was defined as the ratio of the drop center-to-center distance (s) to the initial drop diameter (di). The water content (β) and the oxygen concentration (ΩO2) were fixed at 5% and 21%, while two drop sizes 550 μm and 450 μm were compared. The results showed that the transition of the drop flame occurred for all cases in the experiment. For Si> 10 along the flow direction, the flame around the drops would change from a blue spherical flame to a yellow flame and a wake flame, and the drop flame extinguished later in the downstream region. Soot particles was generated and drops collision and merging occurred to form a flame tube for Si=2.5 in both cases of di= 550 μm and 450 μm. Besides, drop expansion was observed in both cases of di= 550 μm and di= 450 μm, while micro-explosion only occurred in the far downstream region for Si= 40, di= 450 μm. It was also shown that the emulsion drop evaporation rate was not a constant, and the trend of the drop evaporation rate was strongly influenced by changing the initial drop size.

Original languageEnglish
Publication statusPublished - 2012
Event12th International Conference on Liquid Atomization and Spray Systems, ICLASS 2012 - Heidelberg, Germany
Duration: 2012 Sep 22012 Sep 6

Conference

Conference12th International Conference on Liquid Atomization and Spray Systems, ICLASS 2012
Country/TerritoryGermany
CityHeidelberg
Period12-09-0212-09-06

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

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