Numerical Prediction for Subcooled Boiling Flow of Liquid Nitrogen in a Vertical Tube with MUSIG Model

doi:10.1016/S1004-9541(13)60632-1

Chin.J.Chem.Eng. ›› 2013, Vol. 21 ›› Issue (11): 1195-1205.DOI: 10.1016/S1004-9541(13)60632-1

• FLUID DYNAMICS AND TRANSPORT PHENOMENA • Next Articles

Numerical Prediction for Subcooled Boiling Flow of Liquid Nitrogen in a Vertical Tube with MUSIG Model

WANG Simin¹, WEN Jian¹, LI Yamei¹, YANG Huizhu¹, LI Yanzhong¹, Jiyuan Tu²

1 School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China;
2 School of Aerospace, Mechanical and Manufacturing, RMIT University, VIC 3083, Australia

Received:2012-06-12 Revised:2013-05-25 Online:2013-11-26 Published:2013-11-28
Contact: WEN Jian
Supported by:
Supported by the National Natural Science Foundation of China (51106119, 81100707), the Fundamental Research Funds for the Central University of China, Doctoral Fund of Ministry of Education (20110201120052) and the National Science and Technology Surporting Item (2012BAA08B03).

Numerical Prediction for Subcooled Boiling Flow of Liquid Nitrogen in a Vertical Tube with MUSIG Model

王斯民¹, 文键¹, 李亚梅¹, 杨辉著¹, 厉彦忠¹, Jiyuan Tu²

1 School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China;
2 School of Aerospace, Mechanical and Manufacturing, RMIT University, VIC 3083, Australia

通讯作者: WEN Jian
基金资助:
Supported by the National Natural Science Foundation of China (51106119, 81100707), the Fundamental Research Funds for the Central University of China, Doctoral Fund of Ministry of Education (20110201120052) and the National Science and Technology Surporting Item (2012BAA08B03).

Abstract

Abstract: Multiple size group (MUSIG) model combined with a three-dimensional two-fluid model were employed to predict subcooled boiling flow of liquid nitrogen in a vertical upward tube. Based on the mechanism of boiling heat transfer, some important bubble model parameters were amended to be applicable to the modeling of liquid nitrogen. The distribution of different discrete bubble classes was demonstrated numerically and the distribution patterns of void fraction in the wall-heated tube were analyzed. It was found that the average void fraction increases nonlinearly along the axial direction with wall heat flux and it decreases with inlet mass flow rate and subcooled temperature. The local void fraction exhibited a U-shape distribution in the radial direction. The partition of the wall heat flux along the tube was obtained. The results showed that heat flux consumed on evaporation is the leading part of surface heat transfer at the rear region of subcooled boiling. The turning point in the pressure drop curve reflects the instability of bubbly flow. Good agreement was achieved on the local heat transfer coefficient against experimental measurements, which demonstrated the accuracy of the numerical model.

Key words: liquid nitrogen, subcooled boiling, bubble departure diameter, bubble frequency, nucleation site density, MUSIG model

摘要： Multiple size group (MUSIG) model combined with a three-dimensional two-fluid model were employed to predict subcooled boiling flow of liquid nitrogen in a vertical upward tube. Based on the mechanism of boiling heat transfer, some important bubble model parameters were amended to be applicable to the modeling of liquid nitrogen. The distribution of different discrete bubble classes was demonstrated numerically and the distribution patterns of void fraction in the wall-heated tube were analyzed. It was found that the average void fraction increases nonlinearly along the axial direction with wall heat flux and it decreases with inlet mass flow rate and subcooled temperature. The local void fraction exhibited a U-shape distribution in the radial direction. The partition of the wall heat flux along the tube was obtained. The results showed that heat flux consumed on evaporation is the leading part of surface heat transfer at the rear region of subcooled boiling. The turning point in the pressure drop curve reflects the instability of bubbly flow. Good agreement was achieved on the local heat transfer coefficient against experimental measurements, which demonstrated the accuracy of the numerical model.

关键词: liquid nitrogen, subcooled boiling, bubble departure diameter, bubble frequency, nucleation site density, MUSIG model

WANG Simin, WEN Jian, LI Yamei, YANG Huizhu, LI Yanzhong, Jiyuan Tu. Numerical Prediction for Subcooled Boiling Flow of Liquid Nitrogen in a Vertical Tube with MUSIG Model[J]. Chin.J.Chem.Eng., 2013, 21(11): 1195-1205.

王斯民, 文键, 李亚梅, 杨辉著, 厉彦忠, Jiyuan Tu. Numerical Prediction for Subcooled Boiling Flow of Liquid Nitrogen in a Vertical Tube with MUSIG Model[J]. Chinese Journal of Chemical Engineering, 2013, 21(11): 1195-1205.

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Numerical Prediction for Subcooled Boiling Flow of Liquid Nitrogen in a Vertical Tube with MUSIG Model

Numerical Prediction for Subcooled Boiling Flow of Liquid Nitrogen in a Vertical Tube with MUSIG Model

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