ОСОБЛИВОСТІ ТЕПЛООБМІНУ В ПЛАСКОМУ ПОРИСТОМУ МІКРОКАНАЛІ З ГРАНИЧНИМИ УМОВАМИ ПРОКОВЗУВАННЯ ДРУГОГО ПОРЯДКУ
The results of the study of heat transfer under forced convection in a flat porous microchannel taking into account the boundary conditions of slippage of the first and second order are considered. The simulation showed that with decreasing porosity the flow velocity in the central part of the micro...
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| Datum: | 2021 |
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Institute of Engineering Thermophysics of NAS of Ukraine
2021
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| Назва журналу: | Thermophysics and Thermal Power Engineering |
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oai:ojs2.ihenasgovua.s43.yourdomain.com.ua:article-4362021-12-08T07:38:29Z FEATURES OF HEAT TRANSFER IN A FLAT POROUS MICROCHANNEL WITH THE SECOND ORDER SLIP BOUNDARY CONDITIONS ОСОБЛИВОСТІ ТЕПЛООБМІНУ В ПЛАСКОМУ ПОРИСТОМУ МІКРОКАНАЛІ З ГРАНИЧНИМИ УМОВАМИ ПРОКОВЗУВАННЯ ДРУГОГО ПОРЯДКУ Avramenko, A.A. Dmitrenko, N.P. Kovetska, Yu.Yu. Skitsko, O.I. The results of the study of heat transfer under forced convection in a flat porous microchannel taking into account the boundary conditions of slippage of the first and second order are considered. The simulation showed that with decreasing porosity the flow velocity in the central part of the microchannel and the slipping velocity on the wall decrease due to the increase in hydrodynamic resistance. Taking into account the influence of the boundary conditions of the second order shows that the magnitude of the velocity jump on the wall varies depending on the value of the parameter A2. The jump decreases with a positive value of A2, with a negative value - increases in comparison with the case A2 = 0 (first order boundary conditions). Qualitatively similar effects of porosity and second-order boundary conditions were also observed with respect to temperature profiles. The results of the calculation of the relative Nusselt number showed that the decrease in porosity contributes to the intensification of heat transfer. The dynamics of the change in the heat transfer coefficient with an increase in the Knudsen number indicates that an increase in the Prandtl number also leads to an improvement in the thermal interaction of the flow with the channel wall. The analysis of taking into account the boundary conditions of the second order showed that at small values of the Prandtl number (Pr ≤ 1) the influence of the parameter A2 was not observed. At A2 < 0 the effects of the boundary conditions of the second order lead to an increase in the relative Nusselt number, whereas at A2> 0 the value of the normalized Nusselt number decreases in comparison with the case A2 = 0 (boundary conditions of the first order). Представлені результати дослідження процесу теплообміну при вимушеній конвекції в пласкому пористому мікроканалі. Показано вплив пористості на профілі швидкості, температури і коефіцієнт тепловіддачі з врахуванням граничних умов проковзування першого та другого порядку точності. Institute of Engineering Thermophysics of NAS of Ukraine 2021-03-16 Article Article application/pdf https://ihe.nas.gov.ua/index.php/journal/article/view/436 10.31472/ttpe.2.2021.1 Thermophysics and Thermal Power Engineering; Vol 43 No 2 (2021): Thermophysics and Thermal Power Engineering; 5-12 Теплофизика и Теплоэнергетика; Vol 43 No 2 (2021): Thermophysics and Thermal Power Engineering; 5-12 Теплофізика та Теплоенергетика; Vol 43 No 2 (2021): Thermophysics and Thermal Power Engineering; 5-12 2663-7235 uk https://ihe.nas.gov.ua/index.php/journal/article/view/436/366 |
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Thermophysics and Thermal Power Engineering |
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| datestamp_date |
2021-12-08T07:38:29Z |
| collection |
OJS |
| language |
Ukrainian |
| format |
Article |
| author |
Avramenko, A.A. Dmitrenko, N.P. Kovetska, Yu.Yu. Skitsko, O.I. |
| spellingShingle |
Avramenko, A.A. Dmitrenko, N.P. Kovetska, Yu.Yu. Skitsko, O.I. ОСОБЛИВОСТІ ТЕПЛООБМІНУ В ПЛАСКОМУ ПОРИСТОМУ МІКРОКАНАЛІ З ГРАНИЧНИМИ УМОВАМИ ПРОКОВЗУВАННЯ ДРУГОГО ПОРЯДКУ |
| author_facet |
Avramenko, A.A. Dmitrenko, N.P. Kovetska, Yu.Yu. Skitsko, O.I. |
| author_sort |
Avramenko, A.A. |
| title |
ОСОБЛИВОСТІ ТЕПЛООБМІНУ В ПЛАСКОМУ ПОРИСТОМУ МІКРОКАНАЛІ З ГРАНИЧНИМИ УМОВАМИ ПРОКОВЗУВАННЯ ДРУГОГО ПОРЯДКУ |
| title_short |
ОСОБЛИВОСТІ ТЕПЛООБМІНУ В ПЛАСКОМУ ПОРИСТОМУ МІКРОКАНАЛІ З ГРАНИЧНИМИ УМОВАМИ ПРОКОВЗУВАННЯ ДРУГОГО ПОРЯДКУ |
| title_full |
ОСОБЛИВОСТІ ТЕПЛООБМІНУ В ПЛАСКОМУ ПОРИСТОМУ МІКРОКАНАЛІ З ГРАНИЧНИМИ УМОВАМИ ПРОКОВЗУВАННЯ ДРУГОГО ПОРЯДКУ |
| title_fullStr |
ОСОБЛИВОСТІ ТЕПЛООБМІНУ В ПЛАСКОМУ ПОРИСТОМУ МІКРОКАНАЛІ З ГРАНИЧНИМИ УМОВАМИ ПРОКОВЗУВАННЯ ДРУГОГО ПОРЯДКУ |
| title_full_unstemmed |
ОСОБЛИВОСТІ ТЕПЛООБМІНУ В ПЛАСКОМУ ПОРИСТОМУ МІКРОКАНАЛІ З ГРАНИЧНИМИ УМОВАМИ ПРОКОВЗУВАННЯ ДРУГОГО ПОРЯДКУ |
| title_sort |
особливості теплообміну в пласкому пористому мікроканалі з граничними умовами проковзування другого порядку |
| title_alt |
FEATURES OF HEAT TRANSFER IN A FLAT POROUS MICROCHANNEL WITH THE SECOND ORDER SLIP BOUNDARY CONDITIONS |
| description |
The results of the study of heat transfer under forced convection in a flat porous microchannel taking into account the boundary conditions of slippage of the first and second order are considered.
The simulation showed that with decreasing porosity the flow velocity in the central part of the microchannel and the slipping velocity on the wall decrease due to the increase in hydrodynamic resistance. Taking into account the influence of the boundary conditions of the second order shows that the magnitude of the velocity jump on the wall varies depending on the value of the parameter A2. The jump decreases with a positive value of A2, with a negative value - increases in comparison with the case A2 = 0 (first order boundary conditions).
Qualitatively similar effects of porosity and second-order boundary conditions were also observed with respect to temperature profiles.
The results of the calculation of the relative Nusselt number showed that the decrease in porosity contributes to the intensification of heat transfer.
The dynamics of the change in the heat transfer coefficient with an increase in the Knudsen number indicates that an increase in the Prandtl number also leads to an improvement in the thermal interaction of the flow with the channel wall. The analysis of taking into account the boundary conditions of the second order showed that at small values of the Prandtl number (Pr ≤ 1) the influence of the parameter A2 was not observed. At A2 < 0 the effects of the boundary conditions of the second order lead to an increase in the relative Nusselt number, whereas at A2> 0 the value of the normalized Nusselt number decreases in comparison with the case A2 = 0 (boundary conditions of the first order). |
| publisher |
Institute of Engineering Thermophysics of NAS of Ukraine |
| publishDate |
2021 |
| url |
https://ihe.nas.gov.ua/index.php/journal/article/view/436 |
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| first_indexed |
2025-12-17T13:55:38Z |
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2025-12-17T13:55:38Z |
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