Fg plays a similar role to that of the unknown force, in Campbell s models. Fg is resolved into forces Fj and F, and acts at an angle W to F (the flight edge). These forces are in a plane parallel to the screw root surface. The new static force balance yields [Pg.711]

However, the third term of Eq. A5.14 can be simplified using a torque balance about the axis A of Fig. A5.5 [Pg.711]

Coupling Eq. A5.15 with forces A, F4, and as defined using the screw core friction factor, yields the following [Pg.711]

The remaining forces can be defined using pressures, coefficients, and surface areas [Pg.711]

The coefficients of friction,and f are dependent on temperature, pressure, and velocity (Hyun-Spalding model [2]). [Pg.706]

Campbell et al. and Yamamuro et al. assume a form for (or F ) and then determine the solids conveying angle (p. Hyun and Spalding calculated q> using a force balance and two torque balances. Campbell and Dontula and Yamamuro et al. did not use a torque balance in their analysis. The following is a list of assumptions from all the models discussed. Additional assumptions will be added as needed. Assumptions that do not have keys were used by all authors [Pg.706]

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