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Open AccessArticle

Impact of Improved Design on Knudsen Force for Micro Gas Sensor

School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China
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Micromachines 2020, 11(7), 634; https://doi.org/10.3390/mi11070634
Received: 26 May 2020 / Revised: 26 June 2020 / Accepted: 26 June 2020 / Published: 28 June 2020
(This article belongs to the Special Issue Micromachined Gas Sensors)
Knudsen force generated by thermally driven gas flow in a microscale structure has been used for gas detection and has shown immeasurable potential in the field of microelectromechanical system (MEMS) gas sensors due to its novel sensing characteristics. In this article, the performances of three kinds of Knudsen force gas sensors with improved isosceles triangular shuttle arm structures were studied. In the first design, the top side and right side lengths were equal; in the second, the top side and bottom side lengths were equal; and for the third, the bottom side and right side lengths were equal. A detailed investigation including gas flow, thermal characteristics, Knudsen force, and coupling effects between the shuttle-heater pairs was conducted using the direct simulation Monte Carlo (DSMC) method and the main mechanisms for gas flow presented were almost the same in this work. However, the second design returned the highest Knudsen force performance. The value increased by 42.9% (P = 387 Pa) compared to the Knudsen force of the original square shuttle arm. The results also demonstrate that the coupling effects become weak toward the right with an increase in the number of shuttle-heater pairs. View Full-Text
Keywords: Knudsen thermal force; low-pressure gas sensor; direct simulation Monte Carlo (DSMC); MEMS Knudsen thermal force; low-pressure gas sensor; direct simulation Monte Carlo (DSMC); MEMS
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MDPI and ACS Style

Wang, X.; Zhang, Z.; Zhang, W.; Su, T.; Zhang, S. Impact of Improved Design on Knudsen Force for Micro Gas Sensor. Micromachines 2020, 11, 634.

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