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Abstract
This study carried out a three-dimensional, unsteady, numerical simulation to investigate the effects of the cylinder radius, Reynolds number, three-dimensionality and unsteadiness on the mixed convection in a rectangular enclosure containing a cold circular cylinder. The variations in the cylinder radius in the range of 0.1 to 0.3 times the length of the enclosure and the Reynolds number in the range of 100 to 1000 were considered. The flow and thermal structures reached three different regimes depending on the radius of cold cylinder and Reynolds number. The patterns in the flow and thermal fields were categorized into three regimes: steady two-dimensional convection, steady three-dimensional convection, and unsteady three-dimensional convection. The temperature distribution, vortical structure, and Nusselt number for a heated bottom wall were extensively analyzed. The transition of flow regime, flow instability and the heat transfer performances were influenced by the presence of cylinder. In addition, the three-dimensional flow characteristics were quantified using orthogonal enstrophy, and the unsteady characteristics were investigated by carrying out the frequency analysis of Nusselt number. As the three-dimensionality in flow and thermal fields increases and the flow regime changes to the three-dimensional unsteady convection regime, the difference in the results of two and three-dimensional simulations also increases.
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No potential conflict of interest was reported by the authors.
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Notes on contributors
Hyun Woo Cho
Hyun Woo Cho had his undergraduate degree from Pusan National University, South Korea in 2012, and his Ph.D. degree from the same university in 2020. He is currently a Post-doctoral researcher at Rolls-Royce and Pusan National University Technology Center in Thermal Management in Busan, S. Korea. His research interests are focused on numerical simulation on mixed convection.
Yong Gap Park
Yong Gap Park had his undergraduate degree from Pusan National University, South Korea in 2008, and his Ph.D. degree from the same university in 2014. He is currently a Professor at the School of Mechanical Engineering at Changwon National University in Changwon, S. Korea. His research interests are focused on natural convection, heat exchanger and computational fluid dynamics.
Man Yeong Ha
Man Yeong Ha had his undergraduate degree from Pusan National University, South Korea in 1981, his Master degree from Korea Advanced Institute of Science and Technology, S. Korea in 1983, and his Ph. D degree from Pennsylvania State University, USA in 1990. He is currently a Professor at the School of Mechanical Engineering at Pusan National University in Busan, S. Korea. He serves as Editor of the Journal of Mechanical Science and Technology. His research interests are focused on thermal heat management, computational fluid dynamics, and finite volume method using hybrid scheme.
Young Min Seo
Young Min Seo had his undergraduate degree from Pusan National University, South Korea in 2013, and his Ph.D. degree from the same university in 2019. He is currently a Post-doctoral researcher at Rolls-Royce and Pusan National University Technology Center in Thermal Management in Busan, S. Korea. His research interests are focused on natural convection, finite volume method and computational fluid dynamics.