固体粒子の水力輸送に関する研究 (第2報)

単粒子の終速度ならびに粒群の終速度と抗力係数

抄録

The equation of motion for solid material in hydraulic transportation was expressed as
T=F+G
and, it was described in the 1st Report that thrust (T) was given as
T=n_s C_D0γω/2g (ν_m-ν_s) 2a_s
C_D0=drag coefficient of particle alone
The authors examined experimentally and theoretically variation of drag coefficient by increase in the mixture rate.
As a result, in order to calculate the drag coefficient, the authors formed a clear definition of terminal velocity (ν_f) of particle group.
ν_f=ν_f0 (1-3/2q)
ν_f0=√4(ρ-1)gds/3C_D
C_D=drag coefficient of particle group
According as mixture rate of particle group increases, the drag coefficient (C_D) multiplies in the case of rock and water mixture, but does not multiply in the case of coal and water one.