Flow structure and heat transfer characteristics of a pin-finned channel with upright/curved/inclined pin fins under stationary and rotating conditions

2021 ◽  
Vol 127 ◽  
pp. 105483
Author(s):  
Han Yan ◽  
Lei Luo ◽  
Junfeng Zhang ◽  
Wei Du ◽  
Songtao Wang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Flow Structure ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Pin Fins

Flow Structure and Heat Transfer Characteristics of a Rectangular Channel With Pin Fins and Dimples With Different Shapes

2018 ◽  
Vol 11 (2) ◽  
Author(s):  
Lei Luo ◽  
Han Yan ◽  
Wei Du ◽  
Songtao Wang ◽  
Changhai Li ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Friction Factor ◽  
Flow Structure ◽  
Rectangular Channel ◽  
Horseshoe Vortex ◽  
Heat Transfer Characteristics ◽  
Pin Fin ◽  
Heat Transfer Augmentation ◽  
Transfer Characteristics ◽  
Pin Fins

Abstract In this study, numerical simulations are conducted to investigate the effects of pin fin and dimple shape on the flow structure and heat transfer characteristics in a rectangular channel. The studied shapes for dimple and pin fin are circular, spanwise-elliptical, and streamwise-elliptical, respectively. The flow structure, friction factor, and heat transfer performance are obtained and analyzed with Reynolds number ranging from 10,000 to 50,000. Channel with circular pin fin and dimple is chosen as the Baseline. Channels with spanwise-elliptical pin fins have the best heat transfer augmentation, while also accompanied with the largest friction factor. Spanwise-elliptical pin fin generates the strongest horseshoe vortex which is responsible for the best heat transfer augmentation. Besides, channels with streamwise-elliptical pin fins show the worst heat transfer augmentation and the smallest friction factors. Dimple plays an important role in improving the heat transfer. Spanwise-elliptical dimple yields the best heat transfer augmentation which is attributed to the strongest counter-rotating vortex, while streamwise-elliptical dimple shows the worst heat transfer enhancement.

Heat Transfer and Flow Structure in a Latticework Duct With Different Sidewalls

2019 ◽  
Vol 141 (12) ◽  
Author(s):  
Wei Du ◽  
Lei Luo ◽  
Songtao Wang ◽  
Jian Liu ◽  
Bengt Sunden
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Pressure Drop ◽  
Friction Factor ◽  
Flow Structure ◽  
Suction Side ◽  
Reynolds Numbers ◽  
Pressure Side ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics

Abstract Heat transfer characteristics in a latticework duct with various sidewalls are numerically investigated. The crossing angle is 90 deg and the number of subchannels is eleven on both the pressure side and suction side for each latticework duct. The thickness of the ribs is 8 mm and the distance between adjacent ribs is 24 mm. The investigation is conducted for various Reynolds numbers (11,000 to 55,000) and six different sidewalls. Flow structure, pressure drop, and heat transfer characteristics are analyzed. Results revealed that the sidewall has significant effects on heat transfer and flow structure. The triangle-shaped sidewall provides the highest Nusselt number accompanied by the highest friction factor. The sidewall with a slot shows the lowest friction factor and Nusselt number. An increased slot width decreased the Nusselt number and friction factor simultaneously.

Sign in / Sign up

Export Citation Format

Share Document