Abstract
1. The movement of tea-leaves fed in the thrower was analyzed and the formulas of their movement courses, discharge speeds and angles were obtained. The movement courses at several throw positions and with primary speeds were calculated by using these formulas, which were shown in Figs. 2 and 3.
2. Observations of the tea-leaves flowing in casing at several throw positions and speeds revealed that the relative position between inlet and outlet had a strong effect on the movement course of tea-leaves and suction. It seemed that there were a suitable positions which, after observations and mathematical analyses, were obtained as in Fig. 4.
4. If the number revolutions required (N) of impeller is approximated by formula (24), the value of ξ (theoretical revolution number/revolution number required) in this formula is 0.4-0.5.
