Abstract
Understanding heat transfer characteristics of sheet metal is of practical importance in sheet metal rolling operation to ensure strength and quality of final product. We present a numerical study of free surface planar liquid jet impingement on a uniformly heated moving surface. Scale adaptive simulation (SAS) for turbulent flow and volume of fluid (VOF) method was used to capture the liquid-air interface. The computational domain was divided into two parts to carry out 3D simulations, then results of separate domains were superimposed to resolve boundary conditions. A parametric study considered three different jet Reynolds numbers of 4000, 8000 and 12000. Four different surface to jet velocity ratios, us/uj, were considered. We focused on studying interfacial flow characteristics, turbulence intensity variations, and their relation to heat transfer. Splitting the domain into two parts and superimposing results as boundary conditions resulted in a reasonable accuracy and reduced computation cost. We observed that gravity significantly affects interfacial structures at Reynolds number of 4000. As surface velocity increases, the heat removal rate from the impingement surface in the direction of plate motion increases. However, contrasting trends are observed in the reverse direction despite increased turbulence fluctuations with surface velocity.
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Acknowledgments
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) grant, funded by the Korea government (MSIT) (No. 2020R1A2C3010568, 2021R1A6A1A03039696), and by the Bio & Medical Technology Development Program of the National Research Foundation funded by the Korean government (MSIT) (No. 2021M3A9I402294311). In addition, it was also supported by the Korea Environment Industry & Technology Institute (KEITI) through its Ecological Imitation-based Environmental Pollution Management Technology Development Project, and funded by the Korea Ministry of Environment (MOE) (20190027 90003).
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Kuldeep Baghel is a post-doctor at the school of Mechanical Engineering, Sungkyunkwan University, Suwon, Korea. He received his Ph.D. in Mechanical Engineering from the Indian Institute of Technology Bombay, Mumbai, India. His research interests include microfluidics, heat and mass transfer and interfacial flow phenomena.
Zahra is a graduate (M.S.-Ph.D. combined) student of the School of Mechanical Engineering, Sungkyunkwan University, Suwon, Korea. She received her B.S. in Mechanical Engineering from the Pakistan Institute of Engineering and Applied Sciences. Her research interests include microfluidics, heat transfer, electrohydrodynamics, and droplet generation.
Jinkee Lee received his B.S. and M.S. degrees from Korea Advanced Institute of Science and Technology, and his Ph.D. from Brown University, USA. Since 2012, he has been a Professor at the School of Mechanical Engineering and Institute of Quantum Biophysics of Sungkyunkwan University, Korea. His research interests include interfacial flow, microfluidics, biomimetics, and biofluids.
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Baghel, K., Zahra & Lee, J. Free surface planar liquid jet impingement on a moving surface: interfacial flow and heat transfer characteristics. J Mech Sci Technol 36, 5537–5549 (2022). https://doi.org/10.1007/s12206-022-1018-5
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DOI: https://doi.org/10.1007/s12206-022-1018-5