Abstract
The effect of liquid viscosity on pump characteristics was tested for the diffuser-shaped valve-less micro-pump, which consisted of one diffuser/nozzle element and a variable volume chamber with diaphragm driven by a piezoelectric actuator. Experiment was done for the water and glycerin water solution (20 wt%, 40 wt%, 60 wt%). As the result of the present study, it was found that pump performance decreased with increase in the working fluid viscosity and that the decrease in the pump performance depends on Reynolds number of oscillating flow.
