Different jet configurations are employed in this study to reduce the surface temperature of a constant heat flux plate. Parameters such as the average Nusselt number and the temperature distribution on the hot plate are studied in order to propose a configuration of jet that both increases the overall Nusselt number and decreases the maximum temperature on the hot plate. The effects of the number of jets as well as the swirling jet on the average Nusselt number and contours of temperature on the hot plate are investigated. It is found that increasing the number of jets increases the overall Nusselt number but causes the temperature distribution on the hot plate to include areas with higher temperatures. Using a twisted tape at the angle of 180 degrees in a single jet increases the Nusselt number, but it leads to the increase in the maximum temperature obtained on the hot plate. The use of twisted tapes at the angle of 360 degrees and 720 degrees not only reduces the average Nusselt number, it also increases the maximum temperature on the hot surface. Simultaneous use of two swirling jets is highly recommended because the use of two swirling jets which are created by applying a twisted tape at the angle of 180 degrees increases the Nusselt number and also decreases the maximum temperature on the hot surface.
展开▼
