The equilibrium or algebraic Eulerian model

The calculation of the particle velocity with the equilibrium model is based on a simple 

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The equilibrium or algebraic Eulerian model with a single conditional velocity that is based on the mean particle size small particle Stokes number and limited polydispersity (momentum-balance equation only for the continuous phase if the system is dilute or for the mixture of continuous and disperse phases if the system is dense). 

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