Journal
EXPERIMENTAL THERMAL AND FLUID SCIENCE
Volume 86, Issue -, Pages 257-271Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2017.04.003
Keywords
Liquid nitrogen; Flow boiling; Heat transfer coefficient; Small diameter tube; Horizontal flow
Funding
- National Key Basic Research Program [613322]
- Natural Science Foundation of Jiangsu Province [BK20160388]
- Fundamental Research Funds for the Central Universities
- Shaanxi International Science and Technology Cooperation Projects [2014KW09-01]
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In this study, experiments were performed to study the saturated flow boiling heat transfer characteristics of saturated nitrogen in a horizontal stainless steel heated tube with an internal diameter of 2.92 mm and length of 1000 mm. The heat transfer coefficients (1134 data points) were obtained under a wide range of operation conditions (109 cases), e.g. heat flux of 1.4-43.7 kW/m(2), mass flux of 17-0310 kg/(m(2) s), inlet pressure of 192-350 kPa, and vapor quality of 0.0015-0.71. Results showed that nucleate boiling dominated the heat transfer mechanism in the small-diameter horizontal tube under the conditions in the tests. The heat transfer coefficients had little dependence on mass flux or vapor quality but had strong correlation with heat flux and working pressure. Instability of heat transfer was also observed in the experiments when the vapor quality is greater than 0.2. In the experiments, the temperature oscillations show a relatively strong relationship with vapor quality rather than heat flux, suggesting the flow pattern change from steady bubble or plug flow to unsteady annular flow or intermittent local dry out when vapor quality is about 0.2. The correlation of Tran et al. can give predictions in good agreement with the experimental data, and therefore it is recommended in predicting heat transfer coefficient of saturated nitrogen flow boiling in small-diameter horizontal tubes. (C) 2017 Elsevier Inc. All rights reserved.
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