Nonmonotonic Effects of Aerodynamic Force on Droplet Size of Prefilming Air-Blast Atomization

作者：Zhao, Hui; Wu, Zhao-Wei; Li, Wei-Feng; Xu, Jian-Liang; Liu, Hai-Feng^*

来源：Industrial & Engineering Chemistry Research, 2018, 57(5): 1726-1732.

DOI：10.1021/acs.iecr.7b05026

• ANNULAR LIQUID SHEET
• SEDS PROCESS
• AIRBLAST ATOMIZER
• GAS-STREAM
• BREAK-UP
• INNER
• JET
• INSTABILITIES
• MICRONIZATION
• TAYLOR

The goal of this investigation is to improve the understanding of the mechanism on prefilming atomization. The coaxial two-fluid prefilming air-blast atomization has two airflows: inner air jet and outer air jet. It is generally believed that droplet size decreases monotonically with increasing gas velocity in air-blast atomization. However, this work shows that in prefilming atomization the droplet size increases with the increase of gas velocity and then decreases with the increase of gas velocity when the velocity of the other airflow is high. The relationship between two air jets in prefilming air-blast atomization is mutual restriction rather than assistance. To investigate the nonmonotonic phenomenon, the modified Kelvin-Helmhotz and Rayleigh-Taylor instability atomization model for the prefilming air-blast nozzle is induced. This study presents the model developed to predict the performance of coaxial atomizers, and the experimental results are consistent with the model estimates.

• 出版日期2018-2-7
• 单位华东理工大学