Abstract
Paper discusses a device belonging into an interesting and yet little-known family of no-moving-part active fluidic rectifiers. The generated steady component of flow and pressure are driven by input alternating flow from an external source. The absence of moving components results in the unique capability of unlimited life and reliability, especially useful for safety devices. In the experiment, the rectifier generated a pressure keeping dangerous liquid in the active zone. When the driving oscillation stops (like, e.g., due to coolant loss), the liquid leaves the zone under gravity, stopping the performed reaction. This safety facility is simple, inexpensive, and extremely reliable.
Highlights
To secure safe operation it is often required to arrange at least two protective barriers surrounding the space in which the dangerous fluid is handled
A fluidic rectifier must be placed at the receiving end of the power transport by the alternating flow
Nozzles and similar devices typically show a slight dependence of Eu on the Reynolds number of the flow, which for alternating flows [15,20], is usually defined as
Summary
There are engineering applications handling highly dangerous fluids—explosive, radioactive, extremely chemically aggressive, or containing pathogens. Standard flow handling devices (pumps, valves, etc.) do need maintenance from time to time—like replacement of leaky seals, broken springs or diaphragms, tightening of loose screws, etc These activities with increased danger can be avoided by applying fluidics, the technique of handling and controlling fluid flows inside closed invariant-geometry cavities. This, requires the presence of some movable components inside the fluid handling space, such as parts of an electric motors and the pumps they drive Another possibility for power transfer is to use a magnetic force acting through a non-ferromagnetic wall. The mechanical version offers a generally higher efficiency than fluidics since the latter cannot show so long development history
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