Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2018 Impact factor 0.961

Nuclear Science and Techniques ›› 2004, Vol. 15 ›› Issue (2): 123

• MISCELLANEOUS • Previous Articles    

Experimental study on convective boiling heat transfer in narrow-gap annulus tubes

LI Bin,1 ZHAO Jian-Fu,1 ZHOU Fang-De,2 TANG Ze-Mei,1 HU Wen-Rui1   

  1. 1National Microgravity Laboratory, Institute of Mechanics, the Chinese Academy of Sciences, Beijing 100080;
    2The National Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049
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LI Bin, ZHAO Jian-Fu, ZHOU Fang-De, TANG Ze-Mei, HU Wen-Rui. Experimental study on convective boiling heat transfer in narrow-gap annulus tubes.Nuclear Science and Techniques, 2004, 15(2): 123

Abstract: Since convective boiling or highly subcooled single-phase forced convection in micro-channels is an effective cooling mechanism with a wide range of applications, more experimental and theoretical studies are required to explain and verify the forced convection heat transfer phenomenon in narrow channels. In this experimental study, we model the convective boiling behavior of water with low latent heat substance Freon 113 (R-113), with the purpose of saving power consumption and visualizing experiments. Both heat transfer and pressure drop characteristics were measured in subcooled and saturated concentric narrow gap forced convection boiling. Data were obtained to qualitatively identify the effects of gap size, pressure, flow rate and wall superheat on boiling regimes and the transition between various regimes. Some significant differences from unconfined forced convection boiling were found, and also, the flow patterns in narrow vertical annulus tubes have been studied quantitatively.

Key words: Narrow gap annulus tube, Single phase flow, Boiling heat transfer, Two-phase flow pattern