https://doi.org/10.1140/epjp/s13360-022-02912-3
Regular Article
Intensification of heat transfer of a wavy channel with a series of detachable vortex generators; Numerical analysis with rans model modification
1
Department of Mechanical Engineering, Dezful Branch, Islamic Azad University, Dezful, Iran
2
Department of Mechanical Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
3
Department of Mechanical Engineering, Payame Noor University, Tehran, Iran
Received:
22
April
2022
Accepted:
3
June
2022
Published online:
21
June
2022
This study was conducted numerically to investigate the flow structure and heat transfer behavior of a wavy channel, considering the system's various operating conditions in a turbulent regime. In this regard, three-dimensional numerical simulations were performed using a finite volume code and a modified k–ω SST turbulence model. Initially, the findings were compared to existing empirical observations, demonstrating that when the turbulence constant coefficient (β*) was set at 0.075, the best state for predicting the flow and heat transfer exact structure was reached. Additionally, the simulation results were developed to investigate the impact on the flow structure of two series of detachable vortex generators used as a tabulator. The primary advantage of the separable tabulator series was the ability to segregate and avoid sediment collection. According to the observations, the case with the series of separable vortex generators reduced the thermal boundary layer and extended the residence time of the flow, resulting in a 28.5 percent increase in heat transfer rate over the case without the vortex generator. This happens even though the pressure drop is the smallest compared to other methods to improve the heat transfer. It is also found that the use of a rotational speed of 6 rad/s improves the overall heat exchanger system.
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