Труды сотрудников ИВМ СО РАН

[Text] / S. V. Kozlova, I. I. Ryzhkov // Eur. Phys. J. E. - 2014. - Vol. 37, Is. 9. - Ст. 87, DOI 10.1140/epje/i2014-14087-0. - Cited References: 44. - The authors are grateful to Dr. A. V. Minakov for assistance in ANSYS Fluent numerical calculations. This work is supported the Krasnoyarsk Regional Foundation of Scientific and Technical Activity (Grant 02/13). . - ISSN 1292-8941. - ISSN 1292-895XРУБ Chemistry, Physical + Materials Science, Multidisciplinary + Physics, Applied + Polymer Science

Аннотация: In this paper, laminar convective heat transfer of water-alumina nanofluid in a circular tube with uniform heat flux at the tube wall is investigated. The investigation is performed numerically on the basis of two-component model, which takes into account nanoparticle transport by diffusion and thermophoresis. Two thermal regimes at the tube wall, heating and cooling, are considered and the influence of nanoparticle migration on the heat transfer is analyzed comparatively. The intensity of thermophoresis is characterized by a new empirical model for thermophoretic mobility. It is shown that the nanoparticle volume fraction decreases (increases) in the boundary layer near the wall under heating (cooling) due to thermophoresis. The corresponding variations of nanofluid properties and flow characteristics are presented and discussed. The intensity of heat transfer for the model with thermophoresis in comparison to the model without thermophoresis is studied by plotting the dependence of the heat transfer coefficient on the Peclet number. The effectiveness of water-alumina nanofluid is analyzed by plotting the average heat transfer coefficient against the required pumping power. The analysis of the results reveals that the water-alumina nanofluid shows better performance in the heating regime than in the cooling regime due to thermophoretic effect.

WOS

Держатели документа:
[Kozlova, Sofya V.
Ryzhkov, Ilya I.] Inst Computat Modelling SB RAS, Krasnoyarsk 660036, Russia
ИВМ СО РАН

Доп.точки доступа:
Kozlova, S.V.; Ryzhkov, I.I.; Рыжков, Илья Игоревич; Krasnoyarsk Regional Foundation of Scientific and Technical Activity [02/13]

[Текст] : статья / С. В. Козлова, И. И. Рыжков // Образовательные ресурсы и технологии. - 2014. - № 1(4). - С. 313-321

http://www.muiv.ru/vestnik/pdf/pp/ot_2014_1_313-321.pdf


Доп.точки доступа:
Рыжков, Илья Игоревич; Ryzhkov I.I.; Kozlova S.V.

[Электронный ресурс] / С. В. Козлова, И. И. Рыжков // Докл. XIV Всерос. конф. молодых ученых по математическому моделированию и информационным технологиям. - Томск, 2013

Полный текст доклада на сайте конференции


Доп.точки доступа:
Рыжков, Илья Игоревич; Ryzhkov I.I.; Kozlova S.V.

[Текст] / С. В. Козлова // Открытая конференция молодых учёных ИВМ СО РАН по математическому моделированию и информационным технологиям: материалы конференции. - Красноярск : ИВМ СО РАН, 2014. - С. 47-54 . - ISBN 978-5-906455-05-5


Доп.точки доступа:
Kozlova S.V.

[Текст] : статья / С. В. Козлова, И. И. Рыжков // ХI Всероссийский съезд по фундаментальным проблемам теоретической и прикладной механики : сборник докладов. - Казань : Казанский федеральный университет, 2015. - С. 1867-1869 . - ISBN 978-5-00019-492-8

УДК

531(063)

РИНЦ,
Источник статьи

Держатели документа:
Институт вычислительного моделирования СО РАН
Доп.точки доступа:
Рыжков, Илья Игоревич; Ryzhkov I.I.; Kozlova S.V.; ХI Всероссийский съезд по фундаментальным проблемам теоретической и прикладной механики (2015 ; 20.08 - 24.08 ; Казань)

[Текст] : тезисы доклада / С. В. Козлова, И. И. Рыжков // Лаврентьевские чтения по математике, механике и физике : VIII Международная конференция, тезисы докладов : Институт гидродинамики им. М.А. Лаврентьева СО РАН, 2015. - С. 128 . - ISBN 978-5-94671-091-0

РИНЦ,
Источник статьи

Держатели документа:
Институт вычислительного моделирования СО РАН
Сибирский федеральный университет

Доп.точки доступа:
Рыжков, Илья Игоревич; Ryzhkov I.I.; Kozlova S.V.; Лаврентьевские чтения по математике, механике и физике (2015 ; 07.09 - 11.09 ; Новосибирск)
Нет сведений об экземплярах (Источник в БД не найден)

/ S. V. Kozlova, I. I. Ryzhkov // Phys. Fluids. - 2016. - Vol. 28, Is. 11, DOI 10.1063/1.4966640 . - ISSN 1070-6631
Аннотация: This work studies the stationary separation of a multicomponent mixture in a thermogravitational column (TGC). The existing theory for a flat-plate column is extended to the case of a cylindrical column. The equations of motion and heat/mass transfer are written in cylindrical coordinates to take into account the impact of the cylinders curvature and the ratio of their radii on the separation process. To characterize the impact of each component on convective motion induced by thermal diffusion, the dimensionless separation ratios are used. A multicomponent system as a whole is described by the net separation ratio. The approximation neglecting vertical diffusion in the column is employed and conditions for its validity are analyzed. The profiles of velocity, temperature, composition, and density in the column with a multicomponent mixture are found and their dependence on the separation ratios and the ratio of cylinders radii is analyzed. The vertical separation is described by the solutal Rayleigh numbers, which are proportional to the vertical concentration gradients. It is shown that the key relation of TGC theory, which relates the net solutal Rayleigh number to the net separation ratio, essentially depends on the ratio of cylinders radii. The working formulas for the thermal diffusion coefficients are derived and the importance of forgotten effect is discussed. It is found that the vertical separation in the column increases with decreasing the ratio of inner and outer cylinders radii. A detailed comparison of results with the case of a flat-plate column is performed. Example of a ternary hydrocarbon mixture is analyzed on the basis of obtained solution and numerical simulation. © 2016 Author(s).

Scopus,
Смотреть статью,
WOS

Держатели документа:
Institute of Computational Modelling SB RAS, 50/44 Akademgorodok, Krasnoyarsk, Russian Federation
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation

Доп.точки доступа:
Ryzhkov, I.I.; Рыжков, Илья Игоревич; Козлова, Софья Владимировна

/ I. I. Ryzhkov, S. V. Kozlova // Eur. Phys. J. E. - 2016. - Vol. 39, Is. 12, DOI 10.1140/epje/i2016-16130-6 . - ISSN 1292-8941
Аннотация: Abstract.: The stationary and transient Soret separation in a binary mixture with a consolute critical point is studied theoretically. The mixture is placed between two parallel plates kept at different temperatures. A polymer blend is used as a model system. Analytical solutions are constructed to describe the stationary separation in a binary mixture with variable Soret coefficient. The latter strongly depends on temperature and concentration and enhances near a consolute critical point due to reduced diffusion. As a result, a large concentration gradient is observed locally, while much smaller concentration variations are found in the rest of the layer. It is shown that complete separation can be obtained by applying a small temperature difference first, waiting for the establishment of stationary state, and then increasing this difference again. In this case, the critical temperature lies between hot and cold wall temperatures, while the mixture still remains in the one-phase region. When the initial (mean) temperature or concentration are shifted away from the near-critical values, the separation decreases. The analysis of transient behavior shows that the Soret separation occurs much faster than diffusion to the homogeneous state when the initial concentration is close to the critical one. It happens due to the decrease (increase) of the local relaxation time during the Soret (Diffusion) steps. The transient times of these steps become comparable for small temperature differences or off-critical initial concentrations. An unusual (non-exponential) separation dynamics is observed when the separation starts in the off-critical domain, and then enhances greatly when the system enters into the near-critical region. It is also found that the transient time decreases with increasing the applied temperature difference. Graphical abstract: [Figure not available: see fulltext.] © 2016, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.

Scopus,
Смотреть статью,
WOS

Держатели документа:
Institute of Computational Modelling SB RAS, Akademgorodok, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny 79, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Kozlova, S.V.; Kozlova S.V.; Рыжков, Илья Игоревич

[Текст] : статья / Софья Владимировна Козлова, Илья Игоревич Рыжков // Образовательные ресурсы и технологии. - 2016. - № 2. - С. 320-324 . - ISSN 2312-5500
   Перевод заглавия: Detemination of the characteristic time of a binary mixture separation in a cylindrical thermogravitational column

УДК

532.529.2

51-73

Аннотация: В данной работе рассмотрен нестационарный процесс разделения бинарной смеси в цилиндрической термодиффузионной колонне, для которого определена зависимость времени установления стационарного процесса от отношения радиусов цилиндров. При отношении радиусов, близком к единице, значение времени соответствует случаю плоской колонны
In this paper, the unsteady-state binary mixture separation in a cylindrical thermogravitational column is considered. For this process, the dependence of the characteristic time of establishing the steady-state separation on the ratio of the cylinders radii is obtained. When the ratio is close to unity, the characteristic time corresponds to that of a flat-plate column

РИНЦ

Держатели документа:
Институт Вычислительного моделирования СО РАН, Сибирский Федеральный университет

Доп.точки доступа:
Рыжков, Илья Игоревич; Ryzhkov I.I.; Kozlova S.V.

[Текст] : тезисы доклада / С. В. Козлова // Материалы XVII Всероссийской конференции молодых ученых по математическому моделированию и информационным технологиям. - Новосибирск : ИВТ СО РАН, 2016. - С. 44-45


Доп.точки доступа:
Kozlova S.V.

[Текст] : статья / И. И. Рыжков, С. В. Козлова, М. И. Медведева // Моделирование неравновесных систем - 2016 : материалы XVIV Всероссийского семинара. - Красноярск : ИВМ СО РАН, 2016. - С. 85-88

РИНЦ


Доп.точки доступа:
Козлова, Софья Владимировна; Kozlova S.V.; Медведева, М.И.; Ryzhkov I.I.

[Text] : abstract / N. V. Erkaev [et al.] // 11-th International Conference and School «Problems of Geocosmos» : book of abstracts. - Saint-Petersburg, 2016. - P49-50


Доп.точки доступа:
Erkaev, N.V.; Еркаев, Николай Васильевич; Semenov, V.S.; Kubyshkina, D.I.; Ryzhkov, I.I.; Рыжков, Илья Игоревич; Kozlova, S.V.; Kozlova S.V.

[Text] : abstract / S. V. Kozlova, I. I. Ryzhkov // 12th International Meeting on Thermodiffusion : book of abstracts. - Madrid, 2016. - P76


Доп.точки доступа:
Ryzhkov, I.I.; Рыжков, Илья Игоревич; Козлова, Софья Владимировна

[Text] : abstract / S. V. Kozlova [et al.] // 12th International Meeting on Thermodiffusion : book of abstracts. - Madrid, 2016. - P105


Доп.точки доступа:
Kozlova, S.V.; Козлова, Софья Владимировна; Ryzhkov, I.I.; Рыжков, Илья Игоревич; Mialdun, A.; Shevtsova, V.

[Текст] : тезисы доклада / С. В. Козлова, И. И. Рыжков // Тез. докл. XIV Всеросс. шк.-конф. с международным участием «Актуальные вопросы теплофизики и физической гидрогазодинамики». - Новосибирск, 2016. - С. 30-31


Доп.точки доступа:
Рыжков, Илья Игоревич; Ryzhkov I.I.; Kozlova S.V.

/ S. V. Kozlova, I. I. Ryzhkov // Int. J. Heat Mass Transf. - 2018. - Vol. 126. - P660-669, DOI 10.1016/j.ijheatmasstransfer.2018.05.086 . - ISSN 0017-9310
Аннотация: This work deals with the transient separation of a multicomponent mixture in a cylindrical thermogravitational column. The model describing the evolution of separation in vertical direction is derived and solved analytically. It is assumed that the profiles of velocity and temperature in radial direction are established and the forgotten effect as well as vertical diffusion in the column are ignored. The dependence of separation and characteristic transient time on the ratio of inner and outer cylinders radii ? is obtained. The transient time tends to diffusion time along the column height when ? approaches zero, while it reduces to the transient time for a flat–plate column when ? approaches unity. The analytical results are compared with two–dimensional numerical simulation for binary and ternary mixtures, and a good agreement is observed. It is concluded that for typical liquid mixtures, the decrease of radii ratio between inner and outer cylinders results in a slight increase of separation and in a significant increase of transient time. © 2018 Elsevier Ltd

Scopus,
Смотреть статью

Держатели документа:
Institute of Computational Modelling SB RAS, 50/44 Akademgorodok, Krasnoyarsk, Russian Federation
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation

Доп.точки доступа:
Kozlova, S. V.; Ryzhkov, I. I.