Abstract
Abstract
Highlights
The transport and deposition of tiny particles in turbulent flows play important roles in many engineering, environmental and medical systems
The particle adhesion number is introduced to quantify the effect of van der Waals attraction, defined as Ad = 2γ /(ρpu2rmsdp) where γ = A/(24πδ2) is the potential energy associated with van der Waals force with δ = 0.165 nm (Marshall & Li 2014)
The modification ensures the work done by the van der Waals force remains unchanged when particles overlap, such that its overall effect is insensitive to the choice of k and the results remain unchanged as Δt is adjusted
Summary
The transport and deposition of tiny (cohesive) particles in turbulent flows play important roles in many engineering, environmental and medical systems. The Eulerian–Lagrangian method tracks individual particles and solves the fluid phase on an Eulerian mesh with grid spacing larger than the particle diameter It is capable of capturing detailed particle–particle interactions and particle–fluid coupling with moderate computational cost. This approach has been widely applied to study cohesive particles in turbulence (Ho & Sommerfeld 2002; Kosinski & Hoffmann 2010; Breuer & Almohammed 2015; Liu & Hrenya 2018; Sun, Xiao & Sun 2018; Yao & Capecelatro 2018). Most existing studies consider one-way coupling without considering the influences of drag or volume displacement by particles on the fluid Such an approach is not appropriate when modelling large particle aggregates as it over-predicts.
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