The flow boiling heat transfer characteristics of liquid nitrogen in three U-tubes with different curvature ratios were investigated experimentally. The effects of inlet pressure, heat flux, and curvature ratio on heat transfer characteristic are analyzed. The results indicate that the local heat transfer characteristics change obviously as fluid flows through the return bend, especially in the case of high heat flux. The drying out occurs near the inner wall of the return bend under high heat flux. A parameter Rh (down/up), which is defined as the ratio of heat transfer coefficient between the downstream and upstream section of U-bend, is proposed to evaluate the contributions of the curvature ratio to the heat transfer. It is found that the Rh (down/up) increases with the decrease of the curvature ratios. Furthermore, the experiments results of the average heat transfer coefficient are compared with the calculated results of the empirical correlations.
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February 2014
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Flow Boiling Heat Transfer of Liquid Nitrogen in Heated U-Tubes
D. Deng,
D. Deng
1
e-mail: D.Deng@sjtu.edu.cn
1Corresponding author.
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S. W. Xie,
S. W. Xie
e-mail: xiesiwei143@163.com
School of Mechanical Engineering,
School of Mechanical Engineering,
Shanghai Jiaotong University
,800 Dongchuan Road
,Shanghai 200240
, China
Search for other works by this author on:
X. D. Li,
X. D. Li
School of Aerospace, Mechanical,
and Manufacturing Engineering,
e-mail: xiangdong.li@rmit.edu.au
and Manufacturing Engineering,
RMIT University
,P. O. Box 71, Bundoora VIC 3083
, Australia
e-mail: xiangdong.li@rmit.edu.au
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R. S. Wang
R. S. Wang
School of Mechanical Engineering,
e-mail: rswang@sjtu.edu.cn
Shanghai Jiaotong University
,800 Dongchuan Road
,Shanghai 200240
, China
e-mail: rswang@sjtu.edu.cn
Search for other works by this author on:
D. Deng
e-mail: D.Deng@sjtu.edu.cn
S. W. Xie
e-mail: xiesiwei143@163.com
School of Mechanical Engineering,
School of Mechanical Engineering,
Shanghai Jiaotong University
,800 Dongchuan Road
,Shanghai 200240
, China
X. D. Li
School of Aerospace, Mechanical,
and Manufacturing Engineering,
e-mail: xiangdong.li@rmit.edu.au
and Manufacturing Engineering,
RMIT University
,P. O. Box 71, Bundoora VIC 3083
, Australia
e-mail: xiangdong.li@rmit.edu.au
R. S. Wang
School of Mechanical Engineering,
e-mail: rswang@sjtu.edu.cn
Shanghai Jiaotong University
,800 Dongchuan Road
,Shanghai 200240
, China
e-mail: rswang@sjtu.edu.cn
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 15, 2012; final manuscript received September 20, 2013; published online November 7, 2013. Assoc. Editor: Wei Tong.
J. Heat Transfer. Feb 2014, 136(2): 024501 (9 pages)
Published Online: November 7, 2013
Article history
Received:
October 15, 2012
Revision Received:
September 20, 2013
Citation
Deng, D., Xie, S. W., Li, X. D., and Wang, R. S. (November 7, 2013). "Flow Boiling Heat Transfer of Liquid Nitrogen in Heated U-Tubes." ASME. J. Heat Transfer. February 2014; 136(2): 024501. https://doi.org/10.1115/1.4025542
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