| Autor: |
Syaiful, Sugiri, Gladys, Soetanto, Maria F., Myung-whan Bae |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2016, Vol. 1788, p1-7, 7p, 3 Diagrams, 5 Graphs |
| Abstrakt: |
This study shows an experimental result of effects of concave rectangular winglet vortex generator on convection heat transfer coefficient. There are two types of vortex generator those are rectangular winglet and concave rectangular winglet. The aim of this study is to observe effects of geometry and numbers of vortex generator to the increase of heat transfer coefficient. This experiment was done in a glass rectangular channel. Overall, this experiment was conducted with (rectangular and concave rectangular winglets) and without (baseline) vortex generator. Both types of vortex generator were placed at a 30° angle of attack, in an inline position, and variation numbers of vortex generator row of 1, 2 and 3 rows. Vortex generators were mounted on an aluminum plate which was mounted on a heater with 35 watts of heat, inside the rectangular channel. Airflow passed through vortex generators was varied by its inlet velocity to be 0.4 m/s to 2.0 m/s with an interval of 0.2 m/s. The experimental result shows that 3 row of concave rectangular winglet gives the highest heat transfer coefficient enhancement. Nusselt number and j-factor increase but thermal resistance decrease. Experiment results that Nusselt number and j-factor increase up to 205% while thermal resistance decreases up to 67% compared to baseline for the highest Reynolds number. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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