Dimple structure is an effective heat transfer augmentation approach on coolant channel due to its advantage on pressure penalty. The implication of secondary protrusion, which indicates protrusion with smaller dimension than dimple, will intensify the Nusselt number Nu inside dimple cavity without obvious extra pressure penalty. The objective of this study is to numerically analyze the combination effect of dimples and secondary protrusion. Different protrusion–dimple configurations including protrusion print-diameter Dp, protrusion–dimple gap P, and staggered angle α are investigated. From the results, it is concluded that the implication of secondary protrusion will considerably increase the heat transfer rates inside dimple cavity. Cases 4 and 6 possess the highest Nusselt number enhancement ratio Nu/Nu0 reaching up to 2.1–2.2. The additional pressure penalty brought by the protrusion is within 15% resulting in total friction ratio f/f0 among the range of 1.9–2.1. Dimpled channels with secondary protrusions possess higher thermal performance factor TP, defined as (Nu/Nu0)/(f/f0)1/3, among which cases 4 and 6 are the optimal structures. Besides this, the TP of protrusion–dimple channels are comparable to the other typical heat transfer devices, and higher TP can be speculated after a more optimal dimple shape or combination with ribs and fins.
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Numerical Analysis of Flow Structure and Heat Transfer Characteristics in Dimpled Channels With Secondary Protrusions
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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Zhongyang Shen,
Zhongyang Shen
School of Energy and Power Engineering,
Xi’an Jiaotong University,
Xi’an, Shaanxi 710049, China
e-mail: szy_xjtu@163.com
Xi’an Jiaotong University,
Xi’an, Shaanxi 710049, China
e-mail: szy_xjtu@163.com
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Di Zhang,
Di Zhang
Key Laboratory of Thermo-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
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
Search for other works by this author on:
Phillip Ligrani
Phillip Ligrani
Department of Mechanical
and Aerospace Engineering,
University of Alabama in Huntsville,
Huntsville, AL 35899
e-mail: phillip.ligrani@uah.edu
and Aerospace Engineering,
University of Alabama in Huntsville,
Huntsville, AL 35899
e-mail: phillip.ligrani@uah.edu
Search for other works by this author on:
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
Zhongyang Shen
School of Energy and Power Engineering,
Xi’an Jiaotong University,
Xi’an, Shaanxi 710049, China
e-mail: szy_xjtu@163.com
Xi’an Jiaotong University,
Xi’an, Shaanxi 710049, China
e-mail: szy_xjtu@163.com
Di Zhang
Key Laboratory of Thermo-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
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
Phillip Ligrani
Department of Mechanical
and Aerospace Engineering,
University of Alabama in Huntsville,
Huntsville, AL 35899
e-mail: phillip.ligrani@uah.edu
and Aerospace Engineering,
University of Alabama in Huntsville,
Huntsville, AL 35899
e-mail: phillip.ligrani@uah.edu
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 10, 2014; final manuscript received October 12, 2015; published online November 11, 2015. Assoc. Editor: Keith Hollingsworth.
J. Heat Transfer. Mar 2016, 138(3): 031901 (6 pages)
Published Online: November 11, 2015
Article history
Received:
January 10, 2014
Revised:
October 12, 2015
Citation
Xie, Y., Shen, Z., Zhang, D., and Ligrani, P. (November 11, 2015). "Numerical Analysis of Flow Structure and Heat Transfer Characteristics in Dimpled Channels With Secondary Protrusions." ASME. J. Heat Transfer. March 2016; 138(3): 031901. https://doi.org/10.1115/1.4031787
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