Velocity Slip Coefficient and the Diffusion Slip Velocity for a Multicomponent Gas Mixture

1971 ◽  
Vol 14 (12) ◽  
pp. 2599 ◽  
Author(s):  
S. K. Loyalka
Keyword(s):  
Slip Velocity ◽  
Velocity Slip ◽  
Gas Mixture ◽  
Slip Coefficient ◽  
Multicomponent Gas ◽  
Diffusion Slip ◽  
Multicomponent Gas Mixture

scholarly journals О бародиффузии при медленных течениях газовой смеси

2019 ◽  
Vol 89 (5) ◽  
pp. 646
Author(s):  
В.М. Жданов
Keyword(s):  
Equations Of Motion ◽  
Considerable Effect ◽  
Gas Mixture ◽  
Slip Coefficient ◽  
Knudsen Numbers ◽  
Slow Flows ◽  
Diffusion Slip ◽  
The Mean ◽  
The Individual ◽  
Small Knudsen Numbers

AbstractBarodiffusion in slow flows of a gas mixture is studied with an approximation using hydrodynamic equations of motion for the individual mixture components. It is shown that consideration of the viscous momentum transfer and the contribution of Knudsen layers for the mixture flowing in a channel has a considerable effect on the value of the barodiffusion factor. The relations are obtained for the mean diffusion fluxes of components and for the total flux of the mixture in a circular cylindrical capillary; these relations are valid for moderately small Knudsen numbers used for calculation of the diffusion baroeffect and separation effect when the gas mixture flows in a set of capillaries connecting two volumes. The modification of the relations for the barodiffusion factor (and for the diffusion slip coefficient cross-linked with it) allows interpreting the sign alteration of these effects observed experimentally for some gas mixtures at intermediate Knudsen numbers.

Method to optimize high-pressure, multicomponent gas mixing

1976 ◽  
Vol 41 (6) ◽  
pp. 960-963 ◽  
Author(s):  
R. Scacci
Keyword(s):  
High Pressure ◽  
Gas Mixture ◽  
Gas Mixing ◽  
Arbitrary Size ◽  
Multicomponent Gas ◽  
Pressure Storage ◽  
Multicomponent Gas Mixture

By use of the equations derived herein, a method is outlined to determine the optimum filing sequence and to obtain the maximum possible pressure when two or more pure high-pressure gases are to be transferred to a receiver cylinder in order to prepare a multicomponent gas mixture. The method is valid for any number of gas components, originating from high-pressure storage cyclinders of arbitrary size and pressure and for a receiver cylinder to contain initially one or more of the component gases. Percentage concentrations within 1% of desired are easily obtained with this method.

Multicomponent gas mixture analysis using a single tin oxide sensor and dynamic pattern recognition

2001 ◽  
Vol 1 (3) ◽  
pp. 207-213 ◽  
Author(s):  
E. Llobet ◽  
R. Ionescu ◽  
S. Al-Khalifa ◽  
J. Brezmes ◽  
X. Vilanova ◽  
...  
Keyword(s):  
Pattern Recognition ◽  
Tin Oxide ◽  
Gas Mixture ◽  
Mixture Analysis ◽  
Dynamic Pattern ◽  
Multicomponent Gas ◽  
Multicomponent Gas Mixture

scholarly journals Properties of the aggregated quasi-hydrodynamic system of equations for a homogeneous gas mixture with a common regularizing velocity

2021 ◽  
pp. 1-26
Author(s):  
Alexander Anatolievich Zlotnik ◽  
Anna Sergeevna Fedchenko
Keyword(s):  
Original System ◽  
New Technique ◽  
Gas Mixture ◽  
System Of Equations ◽  
Symmetric Form ◽  
Hydrodynamic System ◽  
Constant Solution ◽  
Multicomponent Gas ◽  
A New Technique ◽  
Multicomponent Gas Mixture

We study a quasi-hydrodynamic system of equations for a homogeneous (with common velocity and temperature) multicomponent gas mixture in the absence of chemical reactions, with a regularizing velocity common for the components. We derive the entropy balance equation with a non-negative entropy production taking into account the diffusion fluxes of the mixture components. In the absence of diffusion fluxes, a system of equations linearized at a constant solution is constructed by a new technique, In the absence of diffusion fluxes, a system of equations linearized on a constant solution is constructed by a new technique. It is reduced to a symmetric form, the L^2-dissipativity of its solutions is proved, and a degeneration (with respect to the densities of the mixture components) of the parabolicity property for the original system is established. Actually, the system has the composite type. The obtained properties strictly reflect its physical correctness and dissipative nature of the quasi-hydrodynamic regularization.

scholarly journals Application of a hybrid large-particle method for calculating multicomponent gas mixture flows

2019 ◽  
pp. 489-497
Author(s):  
Д.В. Садин
Keyword(s):  
Large Particle ◽  
Order Approximation ◽  
Particle Method ◽  
Numerical Results ◽  
Gas Mixture ◽  
Wide Range ◽  
Multicomponent Gas ◽  
Self Similar ◽  
Similar Solutions ◽  
Multicomponent Gas Mixture

Статья посвящена обобщению гибридного метода крупных частиц для численного моделирования течений многокомпонентных газовых смесей при наличии границ раздела газов с различными термодинамическими свойствами. Метод относится к алгоритмам сквозного расчета разрывов. Разностная схема является консервативной, однородной и имеет второй порядок аппроксимации по пространству и времени на гладких решениях. Результаты проверки на тестовых задачах в широком диапазоне чисел Маха и отношений газодинамических параметров подтвердили работоспособность метода. Выполнен анализ численных ошибок в окрестности контактных разрывов на сетках различного разрешения, свидетельствующий о сходимости результатов расчета к автомодельным решениям. This paper is devoted to a generalization of a hybrid large-particle method for the numerical simulation of multicomponent gas mixture flows in the presence of gas interfaces with various thermodynamic properties. The method belongs to the class of shock-capturing and interface-capturing algorithms. The employed difference scheme is conservative and uniform and possesses the second order approximation in space and time on smooth solutions. The obtained numerical results show the efficiency of the method in a wide range of Mach numbers and ratios of gas dynamic parameters. The error analysis performed near the contact discontinuities on grids of various resolutions confirms the convergence of numerical results to the self-similar solutions.

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