A Study of Jet Impingement Heat Transfer Performance on Roughened Target Surface with Miniature Pin Fins

作者：Xia, Tian; Liu, Yu Yang; Rao, Yu^*; Chen, Guan Jiang

来源：Journal of Engineering Thermophysics, 2018, 39(9): 1914-1920.

• Flow field features
• Heat transfer characteristics
• Impingement cooling
• Impingement heat transfer
• Jet-to-plate spacing
• Pin-fins
• Roughened surfaces
• Turbulent models

In this paper, steady experiments and numerical simulations were conducted for impingement heat transfer performance on roughened target surface with miniature pin fins, and compared with the flat plate. The jet Reynolds number ranged from 15000∼30000, and the jet-to-plate ratio equaled 1.5, 3 and 5. By conducting steady experiments, total heat transfer characteristics and pressure drop were obtained. k-ωSST turbulent model was used to analyze the flow field features and heat transfer characteristics for CFD method. The results shows that the roughened target surface with miniature pin fins enhances heat transfer obviously, with pressure loss increased slightly. When the ratio of jet-to-plate spacing is 1.5, there is a highest improvement of heat transfer for the whole impingement cooling system. In addition, CFD results show that the miniature pin fins can weaken the heat transfer on the endwall, and when jet-to-plate spacing equals 1.5, 3 and 5, the Nusselt number on the endwall is only 56.3%, 53.0% and 46.8% of that of the flat plate.

• 出版日期2018
• 单位上海交通大学