The negative-differential-resistance (NDR) mechanism of a hydroelastic microfluidic oscillator

Xia, Huan; Wu, Jiawei; Wang, Z P

doi:10.1088/1361-6439/aa703b

Cited by 18 publications

(15 citation statements)

References 30 publications

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“…Notably, we have shown that the framework is programmable, capable of encoding essentially any pressure-drop versus flowrate characteristic in a few simple components. This represents a potential future advance in flow control technology, complementary to existing devices [31][32][33].…”

Section: Discussionmentioning

confidence: 99%

Fluid-structure interactions enable passive flow control in real and biomimetic plants

et al. 2021

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Controlling fluid flow is a fundamental problem with applications from biomedicine to environmental engineering. Contemporary solutions combine electromechanical sensors, valves, and pumps; however, these are expensive and difficult to maintain. We report an autonomous flow control principle inspired by vascular transport in plants. Combining experiments on real and biomimetic tissues, we show that networks of cells linked by nonlinear valves permit the physical programming of a nearly arbitrary pressure drop versus flow rate relation. The nonlinearity is a consequence of fluid-structure interactions that allow a flexible element to selectively block the valve aperture. We report four applications: parallel connections that function as (i) a nonlinear flow controller, (ii) a constant flow controller, (iii) a reverse Ohm flow controller, and a serial connection that acts as (iv) a fluidic on-off switch.

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Section: Discussionmentioning

confidence: 99%

Fluid-structure interactions enable passive flow control in real and biomimetic plants

et al. 2021

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“…The average flow rate and oscillation frequency depend on its geometric structure, elasticity of the diaphragm, the fluid viscosity, and the operating pressure. For a more detailed description of the microfluidic oscillator, please refer to our previous articles. − …”

Section: Design and Fabrication Of The Combinatorial Microfluidic Pla...mentioning

confidence: 99%

“…In this work, we propose a combinatorial microfluidic platform consisting of a microfluidic oscillator and a microchip reactor for preparation and screening of nanoscale single-compound and composite explosives. The microfluidic oscillator is based on our previous works, − which can convert a stable laminar flow to an oscillatory flow. The microchip reactor with a circular chamber was designed to extend the applicable flow rate range of the microfluidic oscillator.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic Platform for Preparation and Screening of Narrow Size-Distributed Nanoscale Explosives and Supermixed Composite Explosives

Zhao

Zhu

et al. 2018

Ind. Eng. Chem. Res.

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A microfluidic platform suitable for the research, preparation, and screening of nanoscale singlecompound and composite explosives was established. The microfluidic platform consisting of a microfluidic oscillator and a microchip reactor has the characteristics of excellent mixing performance, fast preparation, and less sample consumption. Furthermore, the recrystallization growth kinetics of explosives under microscale conditions was studied. Here we use typical explosives HNS (2,2′,4,4′,6,6′-hexanitrostibene) and HMX (cyclotetramethylenete tranitramine) as samples to study the applicability of the microfluidic platform in preparation and screening of nanoscale and composite explosives. Using the microfluidic platform, the optimal preparation conditions were screened efficiently. Additionally, narrow size-distributed nanoscale HNS and supermixed HNS & HMX composite were prepared with production rate of about 45 mg/min. This study demonstrates the feasibility of an efficient, low-cost, and safe way to prepare and screen nanoscale single-compound and composite explosives.

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“…The methods of multiphase flow, such as micro bubbles [ 29 , 30 ]/droplets [ 31 ] and electrochemistry [ 32 ] for microfluidic control are complex in channel fabrication and lack stability or repeatability. Recently, a hydroelastic microfluidic oscillator [ 33 , 34 ], which uses an elastic diaphragm (silicone rubber) as the intermediate layer of the channel, was realized within a medium range of Re (~10–100). Similarly, a microfluidic oscillator was achieved from a channel with two valves made from an elastomeric membrane [ 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of T-Shaped Microfluidic Oscillator with Viscoelastic Fluid

Yuan

Zhang

et al. 2021

Micromachines

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Oscillatory flow has many applications in micro-scaled devices. The methods of realizing microfluidic oscillators reported so far are typically based on the impinging-jet and Coanda effect, which usually require the flow Reynolds number to be at least at the order of unity. Another approach is to introduce elastomeric membrane into the microfluidic units; however, the manufacturing process is relatively complex, and the membrane will become soft after long-time operation, which leads to deviation from the design condition. From the perspective of the core requirement of a microfluidic circuit, i.e., nonlinearity, the oscillatory microfluidic flow can be realized via the nonlinear characteristics of viscoelastic fluid flow. In this paper, the flow characteristics of viscoelastic fluid (Boger-type) in a T-shaped channel and its modified structures are studied by two-dimensional direct numerical simulation (DNS). The main results obtained from the DNS study are as follows: (1) Both Weissenberg (Wi) number and viscosity ratio need to be within a certain range to achieve a periodic oscillating performance; (2) With the presence of the dynamic evolution of the pair of vortices in the upstream near the intersection, the oscillation intensity increases as the elasticity-dominated area in the junction enlarges; (3) Considering the simplicity of the T-type channel as a potential oscillator, the improved structure should have a groove carved toward the entrance near the upper wall. The maximum oscillation intensity measured by the standard deviation of flow rate at outlet is increased by 129% compared with that of the original standard T-shaped channel under the same condition. To sum up, with Wi number and viscosity ratio within a certain range, the regular periodic oscillation characteristics of Oldroyd-B type viscoelastic fluid flow in standard T-shaped and its modified channels can be obtained. This structure can serve as a passive microfluidic oscillator with great potential value at an extremely low Reynolds number, which has the advantages of simplicity, no moving parts and fan-out of two.

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The negative-differential-resistance (NDR) mechanism of a hydroelastic microfluidic oscillator

Cited by 18 publications

References 30 publications

Fluid-structure interactions enable passive flow control in real and biomimetic plants

Fluid-structure interactions enable passive flow control in real and biomimetic plants

Microfluidic Platform for Preparation and Screening of Narrow Size-Distributed Nanoscale Explosives and Supermixed Composite Explosives

Numerical Investigation of T-Shaped Microfluidic Oscillator with Viscoelastic Fluid

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