Abstract
A simple analytical model of a fluidic pump with two diodes is made and the relation between the pumping efficiency and some system parameters is mainly discussed. Its validity is examined expermentally with a pumping system constructed by Zobel-type diodes (chamber diameter: 6cm, height: 1cm) and a pumping cylinder (diameter: 15cm), under some delivery heads (1-2.2m, 9.9m).
The results obtained are as follows:
(1) When the mean liquid level in the pumping cylinder, h, is set at the middle point between the critical suction and delivery levels, the pumping efficiency η has a maximum value (about 0.2 in this equipment).
(2) η is little affected by the amplitude of liquid level variation in the pumping cylinder, when the amplitude is not too small.
(3) An optimum delivery pressure, p+0, exist for a delivery head or a mean delivery flow rate.
(4) As the suction pressure is equivalent to h, the vacuum source equipment could be saved by the decrement of h and the increment of p+0.
