A systematic study of a droplet breakup process in decaying homogeneous isotropic turbulence using a mesoscopic simulation approach

Lai，Jun1,2; Chen，Tao2; Zhang，Shengqi3; Xiao，Zuoli1; Chen，Shiyi1,2,4; Wang，Lian Ping2,4

2022

10.1080/14685248.2022.2146700

JOURNAL OF TURBULENCE   Impact Factor & Quartile

1468-5248

1468-5248

The breakup of a spherical droplet in a decaying homogeneous isotropic turbulence is studied by solving the Cahn–Hilliard–Navier–Stokes equations. This flow provides a great opportunity to study the interactions of turbulent kinetic energy and interfacial free energy and their effects on the breakup dynamics. Three distinct stages of droplet evolution, namely, the deformation stage, the breakup stage, and the restoration stage, are identified and then analysed systematically from several perspectives: a geometric perspective, a dynamic perspective, a global energetic perspective, and a multiscale energy transfer perspective. It is found that the ending time of the breakup stage can be estimated by the Hinze criterion. The kinetic energy of the two-phase flow during the breakup stage is found to have a power-law decay with an exponent (Formula presented.), compared to (Formula presented.) for the single-phase flow, mainly due to the enhanced viscous dissipation generated by the daughter droplets. Energy spectra of the two-phase flow show power-law decay, with a slope between (Formula presented.) and (Formula presented.), at high wave numbers, both in the Fourier spectral space and in the spherical harmonics space.

decaying homogeneous isotropic turbulence Droplet breakup DUGKS phase-field turbulence-interface interaction

SCI

English

Others

National Natural Science Foundation of China (NSFC) Basic Science Center Program[91741101] ; NSFC["91741101","91852205","11961131006"] ; Guangdong Provincial Key Laboratory of Turbulence Research and Applications[2019B21203001] ; Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications[2020B1212030001] ; Shenzhen Science and Technology Program[KQTD20180411143441009]

Mechanics ; Physics

Mechanics ; Physics, Fluids & Plasmas

WOS:000889529200001

TAYLOR & FRANCIS LTD

PHYSICS

2-s2.0-85142430981

Scopus

1.State Key Laboratory for Turbulence and Complex Systems,College of Engineering,Peking University,Beijing,China
2.Guangdong Provincial Key Laboratory of Turbulence Research and Applications,Center for Complex Flows and Soft Matter Research and Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,China
3.Eastern Institute for Advanced Study,Yongriver Institute of Technology,Ningbo,China
4.Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications,Southern University of Science and Technology,Shenzhen,China

Lai，Jun,Chen，Tao,Zhang，Shengqi,et al. A systematic study of a droplet breakup process in decaying homogeneous isotropic turbulence using a mesoscopic simulation approach[J]. JOURNAL OF TURBULENCE,2022.

Lai，Jun,Chen，Tao,Zhang，Shengqi,Xiao，Zuoli,Chen，Shiyi,&Wang，Lian Ping.(2022).A systematic study of a droplet breakup process in decaying homogeneous isotropic turbulence using a mesoscopic simulation approach.JOURNAL OF TURBULENCE.

Lai，Jun,et al."A systematic study of a droplet breakup process in decaying homogeneous isotropic turbulence using a mesoscopic simulation approach".JOURNAL OF TURBULENCE (2022).