Passive flow control and heat transfer enhancement technique has become an attractive method for device internal cooling with low resistance penalty. In the present paper, the flow and heat transfer characteristics in the small scale rectangular channel with different groove–protrusions are investigated numerically. Furthermore, the combination effect with ribs is studied. The numerical results show that on the groove side, the flow separation mainly occurs at the leading edge, and the reattachment mainly occurs at the trailing edge in accordance with the local Nusselt number distribution. On the protrusion side, the separation mainly occurs at the protrusion back porch and enhances the heat transfer at the leading edge of the downstream adjacent groove. The rectangle case provides the highest dimensionless heat transfer enhancement coefficient Nu/Nu0, dimensionless resistance coefficient f/f0, and thermal performance (TP) with the highest sensitivity of Re. When ribs are employed, the separation bubble sizes prominently decrease, especially inside the second and third grooves. The Nu/Nu0 values significantly increase when ribs are arranged, and the one-row case provides the highest heat transfer enhancement by ribs. Besides, the two-row case provides the highest Nu/Nu0 value without ribs, and the three-row case shows the lowest Nu/Nu0 value whether ribs are arranged or not.
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Flow and Heat Transfer Characteristics in Channels With Groove–Protrusions and Combination Effect With Ribs
Lu Zheng,
Lu Zheng
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: water.element@stu.xjtu.edu.cn
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: water.element@stu.xjtu.edu.cn
Search for other works by this author on:
Yonghui Xie,
Yonghui Xie
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: yhxie@mail.xjtu.edu.cn
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: yhxie@mail.xjtu.edu.cn
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Di Zhang,
Di Zhang
Key Laboratory of Thermal Fluid Science and Engineering,
Ministry of Education,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: zhang_di@mail.xjtu.edu.cn
Ministry of Education,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: zhang_di@mail.xjtu.edu.cn
Search for other works by this author on:
Haoning Shi
Haoning Shi
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: shihaoning@stu.xjtu.edu.cn
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: shihaoning@stu.xjtu.edu.cn
Search for other works by this author on:
Lu Zheng
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: water.element@stu.xjtu.edu.cn
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: water.element@stu.xjtu.edu.cn
Yonghui Xie
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: yhxie@mail.xjtu.edu.cn
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: yhxie@mail.xjtu.edu.cn
Di Zhang
Key Laboratory of Thermal Fluid Science and Engineering,
Ministry of Education,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: zhang_di@mail.xjtu.edu.cn
Ministry of Education,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: zhang_di@mail.xjtu.edu.cn
Haoning Shi
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: shihaoning@stu.xjtu.edu.cn
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: shihaoning@stu.xjtu.edu.cn
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 4, 2014; final manuscript received June 24, 2015; published online August 11, 2015. Assoc. Editor: Danesh/D. K. Tafti.
J. Heat Transfer. Jan 2016, 138(1): 014501 (8 pages)
Published Online: August 11, 2015
Article history
Received:
October 4, 2014
Revision Received:
June 24, 2015
Citation
Zheng, L., Xie, Y., Zhang, D., and Shi, H. (August 11, 2015). "Flow and Heat Transfer Characteristics in Channels With Groove–Protrusions and Combination Effect With Ribs." ASME. J. Heat Transfer. January 2016; 138(1): 014501. https://doi.org/10.1115/1.4031077
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