Early turbulence and pulsatile flows enhance diodicity of Tesla's macrofluidic valve
| Autor: | Joanna Abouezzi, Leif Ristroph, Quynh M. Nguyen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Science
Microfluidics Pulsatile flow FOS: Physical sciences General Physics and Astronomy Applied Physics (physics.app-ph) 02 engineering and technology Imaging techniques 01 natural sciences General Biochemistry Genetics and Molecular Biology Article 010305 fluids & plasmas Physics::Fluid Dynamics symbols.namesake Fluid dynamics 0103 physical sciences Fluidics Physics - Biological Physics Scaling Diode Physics Multidisciplinary Turbulence Fluid Dynamics (physics.flu-dyn) Reynolds number General Chemistry Mechanics Physics - Fluid Dynamics Physics - Applied Physics 021001 nanoscience & nanotechnology Mechanical engineering Flow (mathematics) Biological Physics (physics.bio-ph) symbols 0210 nano-technology Devices for energy harvesting |
| Zdroj: | Nature Communications Nature Communications, Vol 12, Iss 1, Pp 1-11 (2021) |
| Popis: | Microfluidics has enabled a revolution in the manipulation of small volumes of fluids. Controlling flows at larger scales and faster rates, or macrofluidics, has broad applications but involves the unique complexities of inertial flow physics. We show how such effects are exploited in a device proposed by Nikola Tesla that acts as a diode or valve whose asymmetric internal geometry leads to direction-dependent fluidic resistance. Systematic tests for steady forcing conditions reveal that diodicity turns on abruptly at Reynolds number \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\rm{Re}}\approx 200$$\end{document}Re≈200 and is accompanied by nonlinear pressure-flux scaling and flow instabilities, suggesting a laminar-to-turbulent transition that is triggered at unusually low \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\rm{Re}}$$\end{document}Re. To assess performance for unsteady forcing, we devise a circuit that functions as an AC-to-DC converter, rectifier, or pump in which diodes transform imposed oscillations into directed flow. Our results confirm Tesla’s conjecture that diodic performance is boosted for pulsatile flows. The connections between diodicity, early turbulence and pulsatility uncovered here can inform applications in fluidic mixing and pumping. Nguyen et al. take a fresh look at Tesla’s concept of an asymmetric fluidic conduit. They show that for alternating flow at high frequencies the device can almost be operated as a diode, enabled by a transition to turbulent-like flow at rather low Reynolds numbers. |
| Databáze: | OpenAIRE |
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