Application of Knudsen thermal force for detection of inert gases

Hassanvand, Amin; Gerdroodbary, M. Barzegar; Moradi, Rasoul; Amini, Younes

doi:10.1016/j.rinp.2018.02.002

Cited by 52 publications

(33 citation statements)

References 28 publications

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“…In this paper, the fluid flow inside the pipe is simulated through the use of the well-known Eulerian/Eulerian model of multiphase flow [40]. Newtonian and isothermal conditions as well as incompressibility are supposed for fluid flow.…”

Section: Mathematical Modeling 21 Hydrodynamicsmentioning

confidence: 99%

“…Moreover, this method allows for estimating the influence of diverse factors. Numerous researchers tried to develop an effective computational scheme, containing accurate discretization methods and solution algorithms, to propose a precise model for simulating the flow in the packings, and a number of codes and softwares were proposed [39][40][41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

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Computational Fluid Dynamics Characterization of High‐Capacity Structured Packing

et al. 2020

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The novel wire gauze structured packing, PACK‐860, was characterized by means of numerical methods. The main features of PACK‐860 such as height equivalent to a theoretical plate (HETP) and dry/wet pressure drop were evaluated. The flow structure in this packing was described by numerical simulation. To estimate the amount of HETP and dry/wet pressure drop, three‐dimensional computational fluid dynamics (3D CFD) modeling with the Eulerian‐Eulerian multiphase approach was applied. The average relative errors between the results obtained from CFD simulation and experimental findings for mass transfer efficiency and wet and dry pressure drop were assessed. Numerical observations were found to agree well with the empirical results, proving the reliability of CFD simulations for modeling separation processes.

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Section: Mathematical Modeling 21 Hydrodynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Characterization of High‐Capacity Structured Packing

et al. 2020

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“…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%

“…In our these papers, the main characteristics of this sensor are investigated and the precision of measured Knudsen force for different gas mixtures, for instance, hydrogen, methane/helium, methane/SO 2 , carbon dioxide, ammonia, and inert gas. These researches are conducted to reveal the performance and capability of this micro gas sensor in diverse operating conditions [14][15][16][17][18]. These works have Application of Knudsen Force for Development of Modern Micro Gas Sensors DOI: http://dx.doi.org /10.5772/intechopen.86807 tried to disclose the influence of temperature difference of cold and hot arm, the gap size, and pressure of domain on the value of the exerted force on the cold side.…”

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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“…Recently, different researchers have scrutinized heat transfer improvement in nanouids. [31][32][33][34][35][36][37][38][39][40][41] In this study, the inuence of an exterior axial magnetic eld used for the obliging convection nanouid ow among two horizontal concentric tubes was numerically investigated considering the impacts of thermal radiation and viscous heat dissipation. A rotary internal tube with a low constant angular velocity value induced the forced ow, and the external tube was xed.…”

Section: Introductionmentioning

confidence: 99%

A numerical simulation for magnetohydrodynamic nanofluid flow and heat transfer in rotating horizontal annulus with thermal radiation

et al. 2019

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The impact of an axial magnetic field on the heat transfer and nanofluid flow among two horizontal coaxial tubes in the presence of thermal radiation was considered in this study. The impact of viscous dissipation was also considered. The well-known KKL (Koo-Kleinsteuer-Li) model was applied to approximate the viscosity of the nanofluid and the effective thermal conductivity. Furthermore, proper transformations for the velocity and temperature were applied in this study to obtain a set of ODEs (ordinary differential equations) for basic equations governing the flow, heat and mass transfer. In addition, the 4th order Runge-Kutta (RK) numerical scheme was applied to solve the differential equations along with the associated boundary conditions. The impacts of different parameters, including Hartmann number, Reynolds number, radiation parameter and aspect ratio, on the heat transfer and flow features were studied. According to the results, the value of the Nusselt number increases with an increase in the radiation parameter, Hartmann number and aspect ratio and a decrease in the Reynolds number and Eckert number. Fig. 8 Effect of aspect ratio on the Nusselt number and skin friction coefficient when Pr ¼ 6.8, h ¼ 0.5, Ec ¼ 0.01, Rd ¼ 0.1, Re ¼ 1, f ¼ 0.04.

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Application of Knudsen thermal force for detection of inert gases

Cited by 52 publications

References 28 publications

Computational Fluid Dynamics Characterization of High‐Capacity Structured Packing

Computational Fluid Dynamics Characterization of High‐Capacity Structured Packing

Application of Knudsen Force for Development of Modern Micro Gas Sensors

A numerical simulation for magnetohydrodynamic nanofluid flow and heat transfer in rotating horizontal annulus with thermal radiation

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