造粒に関する基礎的諸問題 (第2報)

ドラム型造粒機の動力算定式について

抄録

The torque required for the operation of a drum pelletizer has been investigated on the dry granular materials, and with the aid of the angular momentum theory assuming the two dimmensional steady state, the following equation has been induced theoretically.
T=Gx
If uniform bulk density prevails.
T=πρBgR³lJ (1-J)[x_G1-x_G2/R]
With several samples, under the various conditions, has hcen torque measured. These data showed the following relations.
T=Ksinφ_iπρBgR³lJ (1-J)(1.00+A√Rω²/g-B·Rω²/g)
where, A, B, K are constant, and in the present experiments, A=1.35, B=1.15, K=0.938 were obtained. Therefore, power can be calculated as L=Tω.
Lastly, the authors pointed out the theoretical errors in prevailing formulas having reported on the power requirement to drive a rotary dryer and so on.