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Journal of Materials Science and Nanotechnology | Volume 2
October 29-30, 2018 | London, UK
Nanomaterials and Nanotechnology
International Conference on
Population balance modeling for polydisperse fluid-nanoparticle flows
Jianzhong Lin
Zhejiang University, China
P
olydisperse fluid–particle flows arise in many technological
and environmental application including but not limited
to aggregation, ocean spray, flocculation in water treatment,
bubble dynamics in fluids, aerosol dynamical processes in
both chemical engineering and air pollution. Contrary to
monodisperse fluid-particle flows, the principal feature of
these flows is size (or chemical composition, etc.) distribution
of particles, which leads to the different coupling characteristics
between particles and fluid. The numerical simulation of
the polydisperse fluid-particle flows is challenging due to the
polydisperse nature. To characterize the effect of polydispersity
on dynamics of fluid-particle flow, the mesoscale modeling
approach based on the Smoluchowski mean-field theory is
preferred. The key of the modeling approach is to establish a
transported population balance equation (PBE) having many
phase-space variables to describe the particle size distribution,
particle velocity distribution etc. The direct numerical solution
of the transported PBE is intractable for most applications
due to the large number of independent variables. The useful
alternative is to convert the PBE to transport equations in terms
of the moments of the number density function. However,
the moment transport equations are not closed. In this work,
a Taylor-series expansion method of moments (TEMOM) is
applied to achieve the closure of moment transport equations.
The emphasis will be placed on several key issues relevant
to this method when coupled it to Navier-Stokes equation.
The possible direction for the development of this method
and its advantages and shortcomings are also discussed
e:
mecjzlin@zju.edu.cn