Abstract
This paper deals with a novel valveless piston pump, which is using modified Venturi diodes as a replacement for common check valves. The pump characteristic was obtained from CFD simulations in ANSYS Fluent software. The simulations were carried out on a simplified 2D geometry model of the pump. The dependencies of the volumetric efficiency of the pump on parameters of piston motion (frequency and amplitude) and backpressure are the results of the simulations. The principle of the pump is based on different rates of dissipation in the discharge and the suction diode. The paper also presents a qualitative analysis of dissipation function for turbulent flow, which provides further insight into the principle of valveless pumping.
Highlights
Check valves are integral parts of displacement pumps which use a piston or a membrane for the transport of fluid
The first characteristics is the dependency of volumetric efficiency on the frequency of the piston motion
The volumetric efficiency was calculated for several values of the piston motion frequency
Summary
Check valves are integral parts of displacement pumps which use a piston or a membrane for the transport of fluid. The generation of fluid motion is secured by the so-called Liebau effect, when the less rigid tube is periodically pressed This principle of pumping can be used for both open and closed loops and for macro and micro scale pumping [9, 10, 16]. The suction and discharge piping was extended so that the outlet boundary conditions do not influence the flow inside the pump. Another simplification was made with the motion of the piston, which was simulated by a time-dependent inlet boundary condition placed at the beginning of the piston part of the pump. The formula for volumetric efficiency is stated
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