The Nusselt number and the aerodynamic coefficients for oblate particles from Stokes limit to high Reynolds number

This study investigates the modeling of the heat and fluid flow around oblate particles with a wide range of aspect ratios (ω) from 0.2 to 1, incidence angle (α) from 0^o to 90^o, and Reynolds number (Re_p) from 0.1 to 2000. Even though numerous studies have investigated aerodynamic coefficients (drag coefficient-C_D, lift coefficient-C_L, torque coefficient-C_T) of non-spherical particles, there are few studies focused on developing a complete set of correlations for both Nusselt number (Nu) and aerodynamic coefficients for oblate particles at high Reynolds number. Three dimensional flow past oblate particles from Stokes limit to high Reynolds number is modeled using OpenFOAM, which uses a body-fitted solver to perform particle-resolved simulations. The simulation results are validated by Nu and aerodynamic coefficients of spherical and non-spherical particles in literature. It is observed that Nu increases with Re_p for all ω and the impact of α on Nu becomes pronounced at high Re_p; C_D decreases as Re_p increases significantly for all α at low Re_p, while C_D decreases slowly with increasing Re_p at a given α for Re_p>300. C_L and C_T increase as ω decreases within the considered range of Re_p. Compared with widely used literature correlations, the proposed correlations exhibit good precision (mean relative error < 7%) for the oblate particles considered in this study.