Abstract
A good performance of the heat exchanger will support energy efficiency and economic sustainability. One way to improve heat transfer coefficient is to increase turbulent flow by using vortex generators. The addition of vortex generators on heat exchanger will pose wake on the flow field which then reduce the stability of thermal boundary layer and enhance heat transfer coefficient. The effect of winglet vortex generators with the variations of angle of attack (AoA) is studied in this research. Each variation is applied in a single row and three rows of inline configurations. The results show that the addition of vortex generators with 160 o angle of attack and three rows of inline configuration improve heat transfer coefficient as 59% higher than conventional configurations.
Highlights
Heat exchanger is a kind of important equipment and commonly applied in HVAC systems, power plants, waste heat utilization systems, and chemical processing systems [1]
According to the latest research, vortex generator with inline tube arrangement is more optimal for increasing heat transfer
The results show that rectangular winglets are better for increasing heat transfer compared to delta winglet pairs
Summary
Heat exchanger is a kind of important equipment and commonly applied in HVAC systems, power plants, waste heat utilization systems, and chemical processing systems [1]. One way to improve heat transfer coefficient on the air side is to increase the flow turbulence by using vortex generators. Research was performed by comparing the arrangement of inline and staggered heat exchanger tubes. According to the latest research, vortex generator with inline tube arrangement is more optimal for increasing heat transfer. The study of vector-shaped paired winglet generators was shown to improve the heat transfer process in heat exchangers [4,5]. Tian et al studied and compared the performance between delta shaped vortex generators and rectangular winglet at Reynolds number up to 1200. The arrangement of vortex generator affects the heat transfer process. Based on the previous research, numerical simulation is necessary for the application of vortex generators in heat exchanger with variation of AoA and their arrangement. The variation of winglet AoA and their configurations are performed to produce more turbulence and higher heat transfer coefficient
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