Improved subgrid scale model for dense turbulent solid-liquid two-phase flows

摘要: The dense solid-phase governing equations for two-phase flows are obtained by using the kinetic theory of gas molecules. Assuming that velocity distributions obey Maxwell equations, collision term particles under flow conditions is also derived. In comparison with a dilute flow, solid-particle's developed turbulent solid-liquid adopting some relevant terms from equations. Based on Cauchy-Helmholtz theorem and Smagorinsky model, second-order dynamic sub-grid-scale (SGS) in which stress function both strain-rate tensor rotation-rate tensor, proposed to model applying dimension analyses. Applying SIMPLEC algorithm staggering grid system discretized employing slip boundary walls, pressure fields, volumetric concentration calculated. simulation results fairly good agreement experimental data two operating cases conduit rectangular cross-section these comparisons imply models practical.