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Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Flow modelling for applications in process industry
 Bialožyt, Michal ; Jegla, Zdeněk (oponent) ; Hájek, Jiří (vedoucí práce)
This master thesis is aimed to simplify geometry for the purpose of computational fluid dynamics simulations and its influence on the result. A possibility to replace a part of the heat exchangers tube by a porous zone is examined. The porous zone has the same pressure drop as the missing part. Afterwards the heat transfer and its influence on flow and pressure drop is examined. The most effective is to include the heat transfer effect on the pressure drop directly into the porous zone. This approach does not require to solve energy equation. Therefore it takes less computational power. Gained findings are then applied to the real heat exchanger, which has chocking and distribution problems. The porous zone replacement turn out to be a reliable solution. As the next step there was tested the calculation independence on the mesh quality. Burner test chamber was used for this purpose. The mesh was adapted, based on results, after the first calculation. The mesh was refined in a region of swirl and in a region of flame, where were the biggest gradients. The mesh size was almost doubled after the adaptation and calculation was repeated. The calculation with adapted mesh turned to be very time demanding and beyond the scope of this thesis. Preliminary results were processed.
Úplný záznam
Flow modelling for applications in process industry
 Bialožyt, Michal ; Jegla, Zdeněk (oponent) ; Hájek, Jiří (vedoucí práce)
This master thesis is aimed to simplify geometry for the purpose of computational fluid dynamics simulations and its influence on the result. A possibility to replace a part of the heat exchangers tube by a porous zone is examined. The porous zone has the same pressure drop as the missing part. Afterwards the heat transfer and its influence on flow and pressure drop is examined. The most effective is to include the heat transfer effect on the pressure drop directly into the porous zone. This approach does not require to solve energy equation. Therefore it takes less computational power. Gained findings are then applied to the real heat exchanger, which has chocking and distribution problems. The porous zone replacement turn out to be a reliable solution. As the next step there was tested the calculation independence on the mesh quality. Burner test chamber was used for this purpose. The mesh was adapted, based on results, after the first calculation. The mesh was refined in a region of swirl and in a region of flame, where were the biggest gradients. The mesh size was almost doubled after the adaptation and calculation was repeated. The calculation with adapted mesh turned to be very time demanding and beyond the scope of this thesis. Preliminary results were processed.
Úplný záznam

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