A passive Stokes flow rectifier for Newtonian fluids

Abstract Non-linear effects of the Navier–Stokes equations disappear under the Stokes regime of Newtonian fluid flows disallowing a flow rectification behavior. Here we show that passive flow rectification of Newtonian fluids is obtainable under the Stokes regime of both compressible and incompressi...

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Autores principales:	Aryan Mehboudi, Junghoon Yeom
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c3c49362fc1e44a492dd5bd52a9b5262
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spelling	oai:doaj.org-article:c3c49362fc1e44a492dd5bd52a9b52622021-12-02T15:55:08ZA passive Stokes flow rectifier for Newtonian fluids10.1038/s41598-021-89699-y2045-2322https://doaj.org/article/c3c49362fc1e44a492dd5bd52a9b52622021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89699-yhttps://doaj.org/toc/2045-2322Abstract Non-linear effects of the Navier–Stokes equations disappear under the Stokes regime of Newtonian fluid flows disallowing a flow rectification behavior. Here we show that passive flow rectification of Newtonian fluids is obtainable under the Stokes regime of both compressible and incompressible flows by introducing nonlinearity into the otherwise linear Stokes equations. Asymmetric flow resistances arise in shallow nozzle/diffuser microchannels with deformable ceiling, in which the fluid flow is governed by a non-linear coupled fluid–solid mechanics equation. The proposed model captures the unequal deflection profile of the deformable ceiling depending on the flow direction under the identical applied pressure, permitting a larger flow rate in the nozzle configuration. Ultra-low aspect ratio microchannels sealed by a flexible membrane have been fabricated to demonstrate passive flow rectification for low-Reynolds-number flows (0.001 < Re < 10) of common Newtonian fluids such as water, methanol, and isopropyl alcohol. The proposed rectification mechanism is also extended to compressible flows, leading to the first demonstration of rectifying equilibrium gas flows under the Stokes flow regime. While the maximum rectification ratio experimentally obtained in this work is limited to 1.41, a higher value up to 1.76 can be achieved by optimizing the width profile of the asymmetric microchannels.Aryan MehboudiJunghoon YeomNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Aryan Mehboudi Junghoon Yeom A passive Stokes flow rectifier for Newtonian fluids
description	Abstract Non-linear effects of the Navier–Stokes equations disappear under the Stokes regime of Newtonian fluid flows disallowing a flow rectification behavior. Here we show that passive flow rectification of Newtonian fluids is obtainable under the Stokes regime of both compressible and incompressible flows by introducing nonlinearity into the otherwise linear Stokes equations. Asymmetric flow resistances arise in shallow nozzle/diffuser microchannels with deformable ceiling, in which the fluid flow is governed by a non-linear coupled fluid–solid mechanics equation. The proposed model captures the unequal deflection profile of the deformable ceiling depending on the flow direction under the identical applied pressure, permitting a larger flow rate in the nozzle configuration. Ultra-low aspect ratio microchannels sealed by a flexible membrane have been fabricated to demonstrate passive flow rectification for low-Reynolds-number flows (0.001 < Re < 10) of common Newtonian fluids such as water, methanol, and isopropyl alcohol. The proposed rectification mechanism is also extended to compressible flows, leading to the first demonstration of rectifying equilibrium gas flows under the Stokes flow regime. While the maximum rectification ratio experimentally obtained in this work is limited to 1.41, a higher value up to 1.76 can be achieved by optimizing the width profile of the asymmetric microchannels.
format	article
author	Aryan Mehboudi Junghoon Yeom
author_facet	Aryan Mehboudi Junghoon Yeom
author_sort	Aryan Mehboudi
title	A passive Stokes flow rectifier for Newtonian fluids
title_short	A passive Stokes flow rectifier for Newtonian fluids
title_full	A passive Stokes flow rectifier for Newtonian fluids
title_fullStr	A passive Stokes flow rectifier for Newtonian fluids
title_full_unstemmed	A passive Stokes flow rectifier for Newtonian fluids
title_sort	passive stokes flow rectifier for newtonian fluids
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c3c49362fc1e44a492dd5bd52a9b5262
work_keys_str_mv	AT aryanmehboudi apassivestokesflowrectifierfornewtonianfluids AT junghoonyeom apassivestokesflowrectifierfornewtonianfluids AT aryanmehboudi passivestokesflowrectifierfornewtonianfluids AT junghoonyeom passivestokesflowrectifierfornewtonianfluids
_version_	1718385417723576320

A passive Stokes flow rectifier for Newtonian fluids

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