[1] Kong Lingjian, Han Jitian, Chen Changnian, Liu Zhigang, et al. Experimental study of the onset of nucleate boiling invertical helically-coiled tubes [J]. Journal of Southeast University (English Edition), 2018, 34 (3): 402-407. [doi:10.3969/j.issn.1003-7985.2018.03.017]

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Experimental study of the onset of nucleate boiling invertical helically-coiled tubes()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

34

Issue:

2018 3

Page:

402-407

Research Field:

Energy and Power Engineering

Publishing date:

2018-09-20

Info

Title:

Experimental study of the onset of nucleate boiling invertical helically-coiled tubes

Author(s):

Kong Lingjian¹;  Han Jitian²;  Chen Changnian²;  Liu Zhigang¹

¹Energy Research Institute of Shandong Academy Sciences, Jinan 250014, China
²School of Energy and Power Engineering, Shandong University, Jinan 250061, China

Keywords:

two-phase flow;  subcooled flow boiling;  onset of nucleate boiling;  helical coil

PACS:

TK121

DOI:

10.3969/j.issn.1003-7985.2018.03.017

Abstract:

The experiments of the onset of nucleate boiling using R134a as working fluid were conducted in vertical helically-coiled tubes. The experiments were carried out with a range of pressure from 450 to 850 kPa, inlet subcooling from 4.7 to 15.0 ℃, heat flux from 0.11 to 8.9 kW/m² and mass flux from 218.2 to 443.7 kg/(m²·s). The heat flux, superheat and temperature undershoot at the ONB are analyzed in vertical helically-coiled tubes. Also, the effects of mass flux, system pressure, inlet subcooling and geometric parameters on the ONB are studied. The results demonstrate that the inception heat flux and superheat increase with increasing mass flux and inlet subcooling, but decrease with increasing system pressure and helix diameter. The pitch of the helical coil has a slight effect on the wall superheat and heat flux at the ONB. The correlation of heat flux at the ONB of subcooled flow boiling in helical coil is developed based on the experimental data, and it shows a good agreement with the experimental data.

References:

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Memo

Memo:

Biographies: Kong Lingjian(1986—), male, doctor; Han Jitian(corresponding author), male, doctor, professor, jthan@sdu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No. 50776055, 51076084), the Natural Science Foundation of Shandong Province(No.ZR2016YL005).
Citation: Kong Lingjian, Han Jitian, Chen Changnian, et al.Experimental study of the onset of nucleate boiling in vertical helically-coiled tubes[J].Journal of Southeast University(English Edition), 2018, 34(3):402-407.DOI:10.3969/j.issn.1003-7985.2018.03.017.

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