Detection of ammonia gas by Knudsen thermal force in micro gas actuator

Mahyari, Ahmad-Reza Tofangchi; Gerdroodbary, M. Barzegar; Mosavat, Mohammad; Ganji, D.D.

doi:10.1016/j.csite.2018.04.017

Cited by 18 publications

(16 citation statements)

References 33 publications

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“…To analyze the flow field characteristics in the device, the authors constructed a two-dimensional (2D) domain model, as shown in Figure 1 b [ 25 ]. Later, Gerdroodbary et al [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ] conducted a lot of research and found that the gas flow was induced by (nonlinear) thermal stress flow, thermal creep flow, and thermal edge flow. Among these three gas flows, the (nonlinear) thermal stress flow plays the main role.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, within an ambient pressure of 25 Pa to 1500 Pa, MIKRA can achieve the detection of gases (N 2 –H 2 O, Kr–Xe, He–Ne–Ar, N 2 –H 2 , CH 4 –SO 2 , CO 2 , N 2 –NH 3 , and Air–H 2 ) [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. Knudsen force is linearly dependent on the concentration of any gas species in a gas mixture [ 36 ].…”

Section: Introductionmentioning

confidence: 99%

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Impact of Improved Design on Knudsen Force for Micro Gas Sensor

Wang

Zhang

et al. 2020

Micromachines

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of Improved Design on Knudsen Force for Micro Gas Sensor

Wang

Zhang

et al. 2020

Micromachines

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“…Various methods and techniques are applied for the gas sensors [7][8][9][10]. However, current sensors could not perform in the micro scale.…”

Section: Introductionmentioning

confidence: 99%

“…According to this equation, high Knudsen number is obtained by decreasing either the pressure of the domain or size of our model. Previous studies [8][9][10][11][12][13][14][15][16] clearly showed that the Knudsen force is highly proportional to the main characteristics of the gas inside the domain. Actually, thermal stresses are produced by the non-uniformity of the temperature within rarefied gases and create bulk fluid flows that could employ forces on solid body [17,18].…”

Section: Introductionmentioning

confidence: 99%

Application of Knudsen Force for Development of Modern Micro Gas Sensors

Gerdroodbary¹

2020

Gas Sensors

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Development of new simple gas sensor is highly significant due to its various industrial applications. In this chapter, comprehensive studies on the new micro gas sensor of Micro In-plane Knudsen Radiometric Actuator (MIKRA) are done to evaluate the performance of its technique on the detection of gas. This new micro gas sensor works by the radiometric phenomena, which occurs due to temperature difference in rarefied gas. In order to simulate this micro gas sensor, direct simulation Mont Carlo (DSMC) is recognized as a reliable method. This study highly focused on the main mechanisms of the flow feature and force generation in low-pressure domain. In order to study this micro gas sensor, comprehensive numerical results are thoroughly investigated and the effects of primary factors and parameters are revealed. In addition, the main details of computational approach for the simulation of this micro gas sensor are fully presented. Finally, the performance of this sensor in various operating conditions is explained and main findings are discussed.

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“…These superior properties encouraged the investigators [6] to habit this method for evaluation of pressure.…”

Section: Introductionmentioning

confidence: 99%

Development of MEMS gas actuator for analyzing a gas mixture

Moradi

Gerdroodbary

et al. 2019

Scientia Iranica

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In this study, a computational technique is used to investigate the ability of a new MEMS gas actuator (MIKRA) for detection and sensation of the gas mixture. In this actuator, the temperature difference of two arms inside a rectangular domain at rarefied condition induces a Knudsen force which is relative to physical properties of the gas. Both 2d and 3D approaches are applied for the simulation of the flow inside the model. In order to define the flow feature of a low-pressure gas inside the micro gas actuator, a high order equation of Boltzmann should be solved to attain reliable results. Since the domain of this micro gas is non-equilibrium, Direct Simulation Monte Carlo (DSMC) method is applied for the simulation of the model. According to obtained results, a three-dimensional model presents more reliable results and the effect of a gap for three-dimensional model clearly demonstrates the impact of this parameter on the effective Knudsen force.

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Detection of ammonia gas by Knudsen thermal force in micro gas actuator

Cited by 18 publications

References 33 publications

Impact of Improved Design on Knudsen Force for Micro Gas Sensor

Impact of Improved Design on Knudsen Force for Micro Gas Sensor

Application of Knudsen Force for Development of Modern Micro Gas Sensors

Development of MEMS gas actuator for analyzing a gas mixture

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