A Review of Passive Constant Flow Regulators for Microfluidic Applications

Chappel, Eric

doi:10.3390/app10248858

Cited by 17 publications

(20 citation statements)

References 61 publications

(123 reference statements)

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“…Therefore, the MPV is compact, reliable, maintenance-free, which requires no energy. The flow regulators of MPV are dominated by the mechanical regulators having moving components (membrane, piston, cantilever, leaflet, and so on) [ 26 ]. For the MPV with a membrane as the mechanical regulator, the internal fluid pressure drives the elastic membrane to deform, thereby controlling the flow or the switch of opening and closing.…”

Section: Introductionmentioning

confidence: 99%

Flow Regulation Performance Analysis of Microfluidic Passive Valve for High Throughput Liquid Delivery

Chen

et al. 2022

Micromachines

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A microfluidic passive valve (MPV) is important for precise flow control, and it determines the reliability of the microfluidic system. In this paper, a novel MPV capable of delivering a constant flow rate independently of inlet pressure changes is proposed. The flow rate of the MPV is adjusted by the difference between the fluid force on the upper surface of the valve core and the spring force. The constant flow rate of the MPV is maintained by automatically changing the size of the gap channel formed by the groove on the valve core and the baffle on the valve body. The nearly constant flow rate of the MPV is 6.26 mL/min, with a variation of 6.5% under the inlet pressure varied from 1.25 kPa to 3.5 kPa. In addition, the flow characteristics of the MPV are analyzed by numerical simulation. With the increase in the inlet pressure, the maximum velocity gradually increases, while the increment of the maximum velocity decreases. In the movement process of the valve core, the region of pressure drop becomes larger. This work has a certain reference value for the design and research of the MPVs with high throughput liquid delivery.

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Section: Introductionmentioning

confidence: 99%

Flow Regulation Performance Analysis of Microfluidic Passive Valve for High Throughput Liquid Delivery

Chen

et al. 2022

Micromachines

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“…Use of bare elastomers to passively regulate flow in microfluidic channels has been previously reported in literature for many decades ( Chappel, 2020 ). This is generally accomplished by designing a channel with elastomeric walls which contract as pressure increases, regulating the flow rate (or restricting it entirely if pressure is sufficiently high) although more complicated designs have been reported ( Mosadegh et al., 2010 ).…”

Section: Introductionmentioning

confidence: 99%

Elastomeric tubes with self-regulated distension

et al. 2022

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“…Constant flow valves, also known as passive flow control valves, auto regulated valves, or pressurecompensated valves, output a constant flow rate regardless of pressure changes. As it does not require additional energy to drive and has a simple and compact structure, constant flow valve is widely used in industrial water treatment, centrifugal pump protection, irrigation, and other fields [5].…”

Section: Introductionmentioning

confidence: 99%

A Pneumatic Proportional Constant Flow Valve With Mechanical Feedback

Liu

Cai

et al. 2022

IEEE Access

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To make the flow rate of a gas valve insensitive to changes in inlet pressure and to achieve proportional constant flow characteristics, a proportional constant flow valve is proposed, which is mechanically fed back by the pressure of the flowing gas itself. Using air as the source, the motion equation of the spool is established according to pneumatic theory. By means of the steady state equation, it is proved that the valve is insensitive to the change of inlet pressure compared with an ordinary proportional valve, and the optimization direction of the valve is analyzed. Based on Amesim software, the entire model of the pneumatic proportional constant flow valve is established, and the flow characteristic parameters of feedback holes with different diameters are obtained by numerical calculation. Subsequently, through overall simulation, we obtain the specific values of the optimization parameters. Finally, relevant experimental tests are conducted. The results show that the optimized proportional constant flow valve with mechanical feedback has a good proportional constant flow effect compared with the ordinary proportional flow valve.

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A Review of Passive Constant Flow Regulators for Microfluidic Applications

Cited by 17 publications

References 61 publications

Flow Regulation Performance Analysis of Microfluidic Passive Valve for High Throughput Liquid Delivery

Flow Regulation Performance Analysis of Microfluidic Passive Valve for High Throughput Liquid Delivery

Elastomeric tubes with self-regulated distension

A Pneumatic Proportional Constant Flow Valve With Mechanical Feedback

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