Literature Review of Smooth-Bore Solids Conveying Models

2 Literature Review of Smooth-Bore Solids Conveying Models 

The velocity of the plug in the downchannel (z) and tangential (0) directions can be vectorially visualized in Fig. 5.3. Notice that the volumetric flow rate, 0, as well as all of the plug velocities are dependent upon the unknown solids forwarding angle q . 

From Fig. 5.3, it is a straight forward process to determine that the following relationship exists for the solids forwarding angle (p  

With another substitution, the above formula for can be simplified to  

The formulation for Q, given in Eq. 5.7 is wideiy accepted for aii force baiance iitera-ture modeis. The differentiation from modei to modei occurs in the assumptions made to resoive the unknown soiids forwarding angie cp. The vaiue of (p is typicaiiy between 2 and 7 degrees for commerciai extrusions. 

---