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Effect of phase change on jet atomization: a direct numerical simulation study

Published online by Cambridge University Press:  26 January 2022

Xinxin Gao ,
Jianye Chen Open the ORCID record for Jianye Chen [Opens in a new window] ,
Yinan Qiu ,
Yue Ding  and
Junlong Xie
Xinxin Gao
Affiliation:
School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
Jianye Chen*
Affiliation:
School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
Yinan Qiu
Affiliation:
State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing 100028, PR China
Yue Ding
Affiliation:
School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
Junlong Xie
Affiliation:
School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
*
†Email address for correspondence: jianye_chen@hust.edu.cn
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Abstract

Atomization is often accompanied by phase change, which could significantly affect performance parameters such as the cooling efficiency and combustion efficiency of atomization. Nevertheless, the effect of phase change on jet atomization is rarely numerically studied due to the complexity of the coupling of the aerodynamics and the thermodynamics as well as the modelling difficulty caused by the cross-scale flow. In this study, comprehensive direct numerical simulations were carried out to evaluate the effects of phase change on the primary breakup and secondary atomization. Two methods dealing with phase-interface movement and mass transfer across the interface are built to meet the requirements of different modelling scales and Weber numbers. Simulation results indicate that phase change affects the flow behaviours and volume distribution of broken droplets in the primary breakup. In the secondary atomization, phase change leads to significantly different deforming morphologies of droplets with low Weber number and a more thorough breakup of droplets with high Weber number.

JFM classification

Drops and Bubbles: Aerosols/atomization Mathematical Foundations: Computational methods Multiphase and Particle-laden Flows: Gas/liquid flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 935 , 25 March 2022 , A16
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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Gao et al. supplementary movie 1

Droplet deformation with low Weber number

Download Gao et al. supplementary movie 1(Video)
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Gao et al. supplementary movie 2

Secondary atomization of droplet with high Weber number

Download Gao et al. supplementary movie 2(Video)
Video 1 MB

Gao et al. supplementary movie 3

DNS modeling of primary breakup

Download Gao et al. supplementary movie 3(Video)
Video 2.1 MB