Teslav valve

A Teslav valve is a device that functions as a passive, fluidic valve . The valve was patented by Nikola Tesla in 1916 .

The basic idea is that the flow resistance in one flow direction is less than in the opposite. In this way it can be achieved that the flow is given a preferred direction or that the fluid only flows in one direction, that is to say a rectifying effect is achieved. This is achieved by structures that allow a more laminar flow in one direction , but in the opposite direction cause turbulence through eddies and thus increase the flow resistance. The Tesla valve does not completely interrupt the flow in the opposite direction, but only greatly increases the flow resistance. The efficiency of a Tesla valve can be expressed by its diodicity:

{\ displaystyle \ mathrm {Di_ {Valve}} \ cong \ left. {\ frac {\ Delta P_ {r}} {\ Delta P_ {v}}} \ right \ vert _ {\ dot {V}}}

And stand for the pressure drop in the backward and forward direction and for the volume flow .

{\ displaystyle \ Delta P_ {r}}

{\ textstyle \ Delta P_ {v}}

{\ textstyle {\ dot {V}}}

The great advantage of such a valve is that there are no moving parts. It is used in microfluidics , for example for cell culture or in heat pipes . Using the Coandă effect , a Tesla valve can also be used to efficiently mix different substances.

Individual evidence

↑ ^a ^b Nikola Tesla (1920): Valvular Conduit. Patent specification, United States Patent Office Full text in Google Patents
^ ^A ^b Albert Folch: Introduction to BioMEMS . CRC Press , Boca Raton / London / New York 2013, ISBN 978-1-4665-0938-2 , pp. 197-198, 367, 463 .
↑ ^a ^b Hongbin Ma: Factors Affecting Oscillating Motion and Heat Transfer in an OHP . In: Oscillating Heat Pipes . Springer , New York 2015, ISBN 978-1-4939-2503-2 , pp. 205-209 , doi : 10.1007 / 978-1-4939-2504-9_5 .

[patent-1] Nikola Tesla (1920): Valvular Conduit. Patent specification, United States Patent Office Full text in Google Patents

[:0-2] A ^b Albert Folch: Introduction to BioMEMS . CRC Press , Boca Raton / London / New York 2013, ISBN 978-1-4665-0938-2 , pp. 197-198, 367, 463 .

[:1-3] Hongbin Ma: Factors Affecting Oscillating Motion and Heat Transfer in an OHP . In: Oscillating Heat Pipes . Springer , New York 2015, ISBN 978-1-4939-2503-2 , pp. 205-209 , doi : 10.1007 / 978-1-4939-2504-9_5 .