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Keywords = microfluidic passive valve (MPV)

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11 pages, 6392 KB  
Article
Flow Regulation Performance Analysis of Microfluidic Passive Valve for High Throughput Liquid Delivery
by Qi Su, Weiran Chen, Weiping Chen, Zhijiang Jin and Zhenhao Lin
Micromachines 2022, 13(5), 687; https://doi.org/10.3390/mi13050687 - 28 Apr 2022
Cited by 2 | Viewed by 3296
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Heat Transfer and Fluid Flow in Micromachines, Volume II)
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14 pages, 45644 KB  
Article
Fluid-Structure Interaction Analysis on Membrane Behavior of a Microfluidic Passive Valve
by Zhen-hao Lin, Xiao-juan Li, Zhi-jiang Jin and Jin-yuan Qian
Membranes 2020, 10(10), 300; https://doi.org/10.3390/membranes10100300 - 21 Oct 2020
Cited by 15 | Viewed by 4826
Abstract
In this paper, the effect of membrane features on flow characteristics in the microfluidic passive valve (MPV) and the membrane behavior against fluid flow are studied using the fluid-structure interaction (FSI) analysis. Firstly, the microvalve model with different numbers of microholes and pitches [...] Read more.
In this paper, the effect of membrane features on flow characteristics in the microfluidic passive valve (MPV) and the membrane behavior against fluid flow are studied using the fluid-structure interaction (FSI) analysis. Firstly, the microvalve model with different numbers of microholes and pitches of microholes are designed to investigate the flow rate of the MPV. The result shows that the number of microholes on the membrane has a significant impact on the flow rate of the MPV, while the pitch of microholes has little effect on it. The constant flow rate maintained by the microvalve (the number of microholes n = 4) is 5.75 mL/min, and the threshold pressure to achieve the flow rate is 4 kPa. Secondly, the behavior of the membrane against the fluid flow is analyzed. The result shows that as the inlet pressure increases, the flow resistance of the MPV increases rapidly, and the deformation of the membrane gradually becomes stable. Finally, the effect of the membrane material on the flow rate and the deformation of the membrane are studied. The result shows that changes in the material properties of the membrane cause a decrease in the amount of deformation in all stages the all positions of the membrane. This work may provide valuable guidance for the optimization of microfluidic passive valve in microfluidic system. Full article
(This article belongs to the Special Issue Microfluidics and MEMS Technology for Membranes)
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