Numerical analysis of flash-boiling spray characteristics with liquid ammonia

Liquid ammonia is a promising clean fuel, but it has a greater tendency to flash-boil than conventional fuels. This study confirms the reliability of utilizing the Eulerian framework and homogeneous relaxation model for simulating flash-boiling liquid ammonia sprays by comparing the simulation resul...

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Bibliographic Details
Published inPhysics of fluids (1994) Vol. 36; no. 6
Main Authors Wang, Jieming, Wang, Hu, Zheng Zunqing, Yao Mingfa
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.06.2024
Subjects
Ammonia
Aspect ratio
Atomizing
Boiling
Clean fuels
Liquid ammonia
Numerical analysis
Orifices
Phase transitions
Spray characteristics
Two phase flow
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Summary:Liquid ammonia is a promising clean fuel, but it has a greater tendency to flash-boil than conventional fuels. This study confirms the reliability of utilizing the Eulerian framework and homogeneous relaxation model for simulating flash-boiling liquid ammonia sprays by comparing the simulation results with experimental data. The characteristics of single-hole superheated liquid ammonia sprays are analyzed for different orifice aspect ratios and superheat degrees. The results indicate that superheat degree and orifice aspect ratio affect the external spray morphology by affecting the two-phase flow inside the orifice. The strong phase transition due to flash-boiling drives the spray expansion process and increases the velocity. Moreover, the extensive bubble breakup in flash-boiling sprays promotes faster atomization. However, flash-boiling also results in a more pronounced temperature drop in the spray zone. This research can provide valuable insights for future simulations and engineering practices involving flash-boiling ammonia sprays.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0209632