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The effect of heating direction on flow boiling heat transfer of R134a in micro-channels

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Abstract

This paper presents effects of heating directions on heat transfer performance of R134a flow boiling in micro- channel heat sink. The heat sink has 30 parallel rectangular channels with cross-sectional dimensions of 500μm width 500μm depth and 30mm length. The experimental operation condition ranges of the heat flux and the mass flux were 13.48 to 82.25 W/cm2 and 373.3 to 1244.4 kg/m2s respectively. The vapor quality ranged from 0.07 to 0.93. The heat transfer coefficients of top heating and bottom heating both were up to 25 kW/m2 K. Two dominate transfer mechanisms of nucleate boiling and convection boiling were observed according to boiling curves. The experimental results indicated that the heat transfer coefficient of bottom heating was 13.9% higher than top heating in low heat flux, while in high heat flux, the heat transfer coefficient of bottom heating was 9.9%.higher than the top heating, because bubbles were harder to divorce the heating wall. And a modified correlation was provided to predict heat transfer of top heating.

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Acknowledgement

This research was supported by the National Natural Science Foundation of China (No. 51376019).

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Authors and Affiliations

  1. Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, 100044, China

    Mingchen Xu, Li Jia, Chao Dang & Qi Peng

  2. Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing, 100044, China

    Mingchen Xu, Li Jia, Chao Dang & Qi Peng

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  1. Mingchen Xu
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  2. Li Jia
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  3. Chao Dang
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  4. Qi Peng
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Additional information

This research was supported by the National Natural Science Foundation of China (No. 51376019).

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Xu, M., Jia, L., Dang, C. et al. The effect of heating direction on flow boiling heat transfer of R134a in micro-channels. J. Therm. Sci. 26, 166–174 (2017). https://doi.org/10.1007/s11630-017-0926-7

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  • DOI: https://doi.org/10.1007/s11630-017-0926-7

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