Experimental methods for recording the process of diffusion instability in gas systems

DOI: 10.34759/trd-2023-128-09

Аuthors

Poyarkov I. V., Lipatova L. I.^*

Moscow State University of Civil Engineering, MSUCE, 26, Yaroslavskoe shosse, Moscow, 129337, Russia

*e-mail: physics.801.lli@mail.ru

Abstract

The article provides an overview of experimental methods for gas mixture registering the transition from a stable diffusion mode to a state of diffusion instability while mixing process.

Experiments on mixing process registration of gas systems by the shadowgrams method are described. This method allows observing the mixing process dynamics, determining visually the boundary of the mode change during the mass transfer process, as well as obtaining qualitative information on the spatial non-uniformities distribution and the nature of their behavior throughout the unstable mixing process. The catarometric method allows recording the mixing process dynamics, starting from the irregular fluctuations in the total concentration and ending with a steady convective process. The article provides the description of quantitative methods for determining the system thermodynamic parameters, at which diffusion instability occurs. The method for thermodynamic parameters determining with respect to the partial flows of the mixture components allows accurate computing of the stable diffusion boundary, and the method of criteria numbers application allows obtaining the value of the critical number of convective stability for a multicomponent gas mixture under isothermal conditions in the gravity field. The pros and contras of employing the methods in the article while the system parameters determining, at which transition from the diffusion region to the region of unstable diffusion occurs, are analyzed.

It is noted that experimental methods — the tenegram method and the catarometric method — allow us to observe the nature of the mixing process, while quantitative methods — the method of determining thermodynamic parameters with respect to the partial flows of the mixture components and the method of using criterion numbers — allow us to find the conditions under which it changes.

Keywords:

mass transfer; mixing mode; diffusion instability; convection; shadowgram method, catarometric method

References

1. Marrero T.R., Mason E.A. Gaseous Diffusion Coefficients, Journal of Physical and Chemical Reference Data, 1972, no. 1, pp. 117. DOI: 10.1063/1.3253094
2. Miller L., Mason E.A. Oscillating instabilities in multicomponent diffusion, The Physics of Fluids, 1966, no. 9, pp. 711-721. DOI: 10.1063/1.1761737.
3. Mukhambetova A., Kosov V.N. Universum: tekhnicheskie nauki, 2022, no. 5. (98), URL: https://7universum.com/ru/tech/archive/item/13737. DOI:10.32743/UniTech.2022.98.5.13737
4. Kosov V.N., Bychkov A.G., Zhavrin Yu.I. Teplofizika i aeromekhanika, 1994, no. 1, pp. 87-90.
5. Kosov V.N., Fedorenko O.V. Vestnik Moskovskogo gosudarstvennogo oblastnogo pedagogicheskogo universiteta, 2018, no. 1, pp. 119-127.
6. Kosov V.N., Zhavrin Yu.I., Mukamedenkyzy V., Fedorenko O.V., Moldabekova M.S. Sovremennaya nauka: issledovaniya, idei, rezul’taty, tekhnologii, 2012, no. 2 (10), pp. 155-158.
7. Kosov V.N., Seleznev V.D., Zhavrin Yu.I. Inzhenerno-fizicheskii zhurnal, 2000, vol. 73, no. 2, pp. 313-320.
8. Stommel H., Arons A., Blanchard D. An oceanographical curiosity: the perpetual salt fountain, Environmental Science, 1955, no. 3, pp. 152-153. DOI:10.1016/0146-6313(56)90095-8.
9. Gershuni G.Z., Zhukhovitskii E.M. Konvektivnaya neustoichivost’ neszhimaemoi zhidkosti (Convective Stability of Incompressible Fluid), Moscow, Nauka, 1972, 392 p.
10. Aleksandrov O.E., Seleznev V.D. Zhurnal tekhnicheskoi fiziki, 2017, vol. 90, no. 3, pp. 550-556.
11. Zhavrin Yu.I., Mukamedenkyzy V., Poyarkov I.V. Zhurnal tekhnicheskoi fiziki, 2007, vol. 52, no. 7, pp. 947-949.
12. Komarov V.V., Ponomarev A.A., Ponomarev N.B. Trudy MAI, 2010, no. 40. URL: https://trudymai.ru/eng/published.php?ID=22868
13. Bykov L.V., Nikitin P.V., Pashkov O.A. Trudy MAI, 2014, no. 78. URL: https://trudymai.ru/eng/published.php?ID=53445
14. Bodryshev V.V., Abashev V.M., Tarasenko O.S., Mirolyubova T.I. Trudy MAI, 2016, no. 88. URL: https://trudymai.ru/eng/published.php?ID=70428
15. Moldabekova M.S., Asembaeva M.K., Fedorenko O.V. Inzhenerno-fizicheskii zhurnal, 2019, vol. 92, no. 4, pp. 901-905.
16. Trengove R.D., Robjohnsand H.L., Dunlop P.J. Diffusion coefficients and thermal diffusion factors for H2—N2, D2—N2 and H2—O2, D2—O2 systems, Physical Chemistry, 1983, no. 87, pp. 1187-1190.
17. Kosov V.N., Krasikov S.A., Fedorenko O.V. Evropeiskii fizicheskii zhurnal. Spetsial’nye temy, 2017, no. 226, pp. 1177-1187. DOI:10.1140/epjst/e2016-60201-1
18. Kosov V.N., Kul’zhanov D.U., Zhavrin Yu.I. Zhurnal fizicheskoi khimii, 2017, vol. 91, no. 6, pp. 984-989. DOI:10.7868/S0044453717060152
19. Fedyushkin A.I., Puntus A.A. Trudy MAI, 2017, no. 102. URL: https://trudymai.ru/eng/published.php?ID=98829
20. Kossov V., Asembaeva M., Mukamedenkyzy V. et al. Intensification of the Separation of Isothermal Ternary Gas Mixtures Containing Carbon Dioxide, Chemical Engineering & Technology, 2021, vol. 44 (11). DOI:10.1002/ceat.202100241
21. Zhavrin Yu.I., Kosov V.N., Kul’zhanov D.U., Fedorenko O.V. Eksperimental’nye metody issledovaniya diffuzii i kontsentratsionnoi gravitatsionnoi konvektsii, vyzvannoi neustoichivost’yu mekhanicheskogo ravnovesiya v mnogokomponentnykh gazovykh smesyakh (Experimental methods for studying diffusion and concentration gravitational convection caused by instability of mechanical equilibrium in multicomponent gas mixtures), Almaty, Қazaқ universitetі, 2015, 172 p.

Download