Solid particle interaction dynamics at critical stokes number in isotropic turbulence
Visualitza/Obre
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/186856
Tipus de documentText en actes de congrés
Data publicació2019
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
Binary solid spherical particle-particle interactions are studied in forced isotropic turbulence at 𝑅𝑅𝑒𝑒𝜆𝜆 = 29 and 197 using direct numerical simulation and an immersed boundary method. Isotropic turbulence in a periodic box is forced using a linear forcing method to maintain statistically stationary turbulence, with inter-particle interaction modelled using DLVO interaction forces which include attraction and repulsion due to van der Waals and electric double layer potential forces, respectively. Particle collisions are modelled using the inelastic hard sphere model with a coefficient of restitution of 0.4. The DLVO parameters are chosen to be representative of calcite particles, a simulant of nuclear waste material found in storage ponds in the UK. The Reynolds numbers chosen for the boxes are equivalent to typical values of 𝑅𝑅𝑒𝑒𝜆𝜆 that are found in the bulk flow and viscous sub-layer regions of a turbulent channel flow at 𝑅𝑅𝑒𝑒𝜏𝜏=180. The techniques described are used to study the dynamics of critical Stokes number particles in turbulence by analysing probability density functions (PDFs) of collision statistics such as particle displacement and the particles’ relative velocities to determine the likelihood of agglomeration. The results indicate that agglomeration can occur in both the 𝑅𝑅𝑒𝑒𝜆𝜆 turbulent boxes considered. However, the occurrence is much more likely at lower 𝑅𝑅𝑒𝑒𝜆𝜆 values due to the higher dispersion of kinetic energy after impact.
ISBN978-84-121101-1-1
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Particles_2019-62-Solid particle interaction.pdf | 624,4Kb | Visualitza/Obre |