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مکانیک::
ضریب ناهمگنی
where Hd is the heterogeneity factor (see Chapter 3 for more details)
In this approach, the Wen and Yu (1966) drag model is multiplied by a heterogeneity factor, Hd, that is calculated by solving Eqs.
Finally, the heterogeneity factor is calculated by Eq.
Fig 3.1 Heterogeneity factor (Hd) as a function of voidage at different slip velocities (This figure was originally published in Powder Technol 288, 2016 and has been reused with permission)
Ghadirian and Arastoopour (2016) calculated the heterogeneity factor Hd (the ratio of drag force for nonhomogeneous solid-phase flow using the EMMS approach to drag force calculated using the Wen and Yu drag expression for a homogeneous solid-phase flow system) as a function of voidage at different specific slip velocities for flow of gas and particles with 185 �m diameter and 2500 kg/m3 density.
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