Publicou 12 edições por ano
ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684
Indexed in
MODELING INTERPHASE TURBULENT KINETIC ENERGY TRANSFER IN LAGRANGIAN-EULERIAN SPRAY COMPUTATIONS
RESUMO
Modeling turbulent multiphase flows, such as sprays, is a major challenge owing to droplet (or solid-particle) interactions with a wide range of turbulence length and time scales. In a broad class of Lagrangian-Eulerian models, the instantaneous Lagrangian dispersed-phase velocity evolves on a time scale that is proportional to the particle response time τp = (ρddp2)/ (ρf18νf). Numerical simulations of a model from this class reveal a nonmonotonic and unphysical increase of the turbulent kinetic energy (TKE) in the dispersed phase kd that is not seen in direct numerical simulations (DNS) of decaying, homogeneous turbulence laden with solid particles. Analysis of this class of models shows that for a linear drag law corresponding to the Stokes regime, the entire class of models will predict an anomalous increase in kd for decaying turbulent flow laden with solid particles or droplets. Even though the particle response time is the appropriate time scale to characterize momentum transfer between sub-Kolmogorov-size dispersed-phase particles and the smallest turbulent eddies (for droplet/particle Reynolds number of < 1), it is incapable of capturing the range of time- and length-scale interactions that are reflected in the evolution of kd. A new model that employs a time scale based on a multiscale analysis is proposed. This model succeeds in capturing the dispersed-phase TKE and fluid-phase TKE evolution observed in DNS. The model also correctly predicts the trends of TKE evolution in both phases for different Stokes numbers.
-
Jin Guodong, He Guo-Wei, Wang Lian-Ping, Large-eddy simulation of turbulent collision of heavy particles in isotropic turbulence, Physics of Fluids, 22, 5, 2010. Crossref
-
PAI MADHUSUDAN G., SUBRAMANIAM SHANKAR, A comprehensive probability density function formalism for multiphase flows, Journal of Fluid Mechanics, 628, 2009. Crossref
-
Pai Madhusudan G., Subramaniam Shankar, Two-way coupled stochastic model for dispersion of inertial particles in turbulence, Journal of Fluid Mechanics, 700, 2012. Crossref
-
Pai M.G., Subramaniam S., Modeling droplet dispersion and interphase turbulent kinetic energy transfer using a new dual-timescale Langevin model, International Journal of Multiphase Flow, 33, 3, 2007. Crossref
-
Subramaniam Shankar, Lagrangian–Eulerian methods for multiphase flows, Progress in Energy and Combustion Science, 39, 2-3, 2013. Crossref
-
Kolakaluri Ravi, Subramaniam Shankar, Panchagnula Mahesh V., Trends in Multiphase Modeling and Simulation of Sprays, International Journal of Spray and Combustion Dynamics, 6, 4, 2014. Crossref
-
Ling Y., Balachandar S., Parmar M., Inter-phase heat transfer and energy coupling in turbulent dispersed multiphase flows, Physics of Fluids, 28, 3, 2016. Crossref
-
Subramaniam Shankar, Balachandar S., Towards Combined Deterministic and Statistical Approaches to Modeling Dispersed Multiphase Flows, in Droplets and Sprays, 2018. Crossref
-
Ramezani M., Sun B., Subramaniam S., Olsen M.G., Detailed experimental and numerical investigation of fluid–particle interactions of a fixed train of spherical particles inside a square duct, International Journal of Multiphase Flow, 103, 2018. Crossref