food manufacture / interstitial gas drag / gas drag / fluid-gas / mechanical energy / gas flow / gas radial flow function / gas ffp / pharmaceuticals industry / outlet orifice diameter fg gas volume flow rate / transportation / gas-drag effects / gas effects / gas velocity / Gas flow parallel / hopper draw gas / sharp gas pressure gradient / account gas effects / coupled gas / gas pressure / gas velocity field / energy theorem / gas pressure gradient / gas outflow velocity / interstitial gas / superficial gas velocity / friction gas density particle density bulk particle density / gas-solid / closed form solution / gas flow effects / gas density / minimum energy surface / gas velocity data / gas dynamics / gas velocity vectors / gas velocity ur particle slip velocity / radial gas flow / fluidparticle interaction systems / minimum energy argument / thin annular gas backflow / gas phase / gas modelling / gas volume flow rates / gas flow model / energy / /
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