ПЛІВКОВЕ КИПІННЯ РІДИНИ БІЛЯ ВЕРТИКАЛЬНОЇ ПЛАСТИНИ В ПОРИСТОМУ СЕРЕДОВИЩІ
The paper presents results of the modeling of heat transfer at film boiling of a liquid in a porous medium on a vertical heated wall. Such processes are observed at cooling of high-temperature surfaces of heat pipes, microstructural radiators etc. Heating conditions at the wall were the constant wal...
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| Datum: | 2022 |
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| Hauptverfasser: | , , , , |
| Format: | Artikel |
| Sprache: | Ukrainian |
| Veröffentlicht: |
Institute of Engineering Thermophysics of NAS of Ukraine
2022
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| Online Zugang: | https://ihe.nas.gov.ua/index.php/journal/article/view/484 |
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| Назва журналу: | Thermophysics and Thermal Power Engineering |
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Thermophysics and Thermal Power Engineering| Zusammenfassung: | The paper presents results of the modeling of heat transfer at film boiling of a liquid in a porous medium on a vertical heated wall. Such processes are observed at cooling of high-temperature surfaces of heat pipes, microstructural radiators etc. Heating conditions at the wall were the constant wall temperature or heat flux.
An analytical solution was obtained for the problem of fluid flow and heat transfer using the Darcy-Brinkman porous medium model. It was shown that heat transfer at film boiling in a porous medium was less intensive than in the absence of a porous medium and further decreased with the decreasing permeability of the porous medium. A sharp decrease in heat transfer was observed for the Darcy numbers lower than five. Effects of different thermal boundary conditions on the heated wall on the heat transfer are insignificant. |
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