カプセルの流体輸送に関する研究

抗力係数の乱流特性について (第2報)

抄録

In this paper, the flow between the wall of tube and that of capsule freely suspended in a vertical tube with water canbe considered as the turbulent flow based on the Reynolds number range R>5×10⁵, where R=U_ml/ν, U_m is the superficialmean velocity of flow suspending capsule, l the length of capsule and ν the kinematic viscosity of the fluid.
The hydrodynamic analysis on the turbulent boundary layers around a solid capsule and an inner wall of tube is developedand the effects of capsule/pipe diameter ratio, capsule length/diameter ratio on the drag coefficient of capsule are introduced.
As described, in the previous paper, similar approach was executed. Then, a drag coefficient of capsule can be expressedtheoretically and experimentally by a function of characteristics number.