A Numerical Investigation of Flow and Heat Transfer of Laminar Multiple Slot Jets Impinging on Multiple Protruding Heat Sources

Abstract

The flow and heat transfer behavior of laminar incompressible slot jets impingement cooling of an array of heated surfaces in a channel have been investigated numerically. The computations are done for a variety of values of slot jets Reynolds number, channel height and distance between two heated blocks. The influences of these geometrical and physical parameters are predicted. The results, streamline contour, velocity profile, isothermal contour, local Nusselt number, and average Nusselt number are compared and documented. The first and second recirculation cells size are gradually increased, and the highest heat transfer rate is attained when Reynolds number increased. However, the heat transfer rates are decreased when channel height increased. The peak local Nusselt number value is noticed at stagnation point of the first block by first jet, and the second peak local Nusselt number value is observed at fourth block by second jet. The distances between two blocks play a significant role in the downstream velocity which leads to create the strong recirculation cells in between the two heated blocks when the distance between the two blocks increased.

Disclosure Statement

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Maheandera Prabu Paulraj

Maheandera Prabu Paulraj is currently pursuing his Postdoctoral research as a National Postdoctoral Fellow in the Fluid Mechanics and Machinery laboratory, Discipline of Mechanical Engineering at Indian Institute of Technology Indore, M.P, India. He received the doctoral degree from Anna University Chennai in 2016. He obtained Master degree from PSG College of Technology, Coimbatore (Anna University) in 2008. He has published 5 international peer-reviewed journals and currently he is working in the area of computational flow and heat transfer, energy solutions (solar, bio-fuel and bio-mass energy), sudden expansion flow, and nano-fluids.

Chan Byon

Chan Byon is a professor of School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology, Korea. He received his doctoral degree in 2012, Master of Science in 2008 and Bachelor degree in 2006 from Korea Advanced Institute of Science and Technology, Korea. He has published over 60 international journals and 25 international conferences in the area of microscale flow/thermal management, micro/nanostructures for enhanced heat transfer, electronics cooling, renewable energies and energy generation/conversion.

Andrea Vallati

Andrea Vallati is associate professor of Thermal Sciences (B.S. Civil Engineering) at the Faculty of Civil and Industrial Engineering of Sapienza University of Rome, Italy. He received Ph.D. degree in the area of Thermophysical Properties of Materials and M.S. degree in Mechanical Engineering. He interests include energy saving, energy and buildings, CFD in outdoor and indoor environment, energy efficiency, optimization of HVAC systems and the heat transfer above the soil.

Rajesh Kanna Parthasarathy

Rajesh Kanna Parthasarathy is a professor of Mechanical Engineering at College of Engineering and Computing Al Ghurair University, Dubai, UAE. He received his doctorate from Indian Institute of Technology Guwahati in 2006 and later Doctor of Science from Cracow University of Technology Poland in 2015. He has published more than 45 international journals and over 20 international conference papers in the area of jet flow, flow over bluff body, porous medium, conjugate heat transfer, natural convection in room ventilation, and nanofluid heat transfer. Presently he is working on nanofluid flow over bluff body, cavity flow using carbon nanotubes, and solar air heaters.