On the modelling of pressure drop for dense phase pneumatic conveying of powders
The pressure drop for a straight horizontal section of pipe for the solids-gas mixture can be calculated using Equation 1, as given by Barth (1]. This expression was considered by Weber  as applicable only to coarse particles in dilute-phase flow. However, this equation has been used subsequently by various researchers [3 to 7] to predict the pressure loss for dense-phase flow of fine powders, suth as fly ash.
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