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Heat Transfer Research
インパクトファクター: 0.404 5年インパクトファクター: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN 印刷: 1064-2285
ISSN オンライン: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2017016873
pages 991-1001

POOL BOILING EXPERIMENT ON A MODIFIED MICROPIN-FINNED SURFACE WITH MECHANICAL OSCILLATION

Jin-Jia Wei
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P.R. China; Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong Uniersity, Xi'an, 710049, P.R.China
Xin Kong
State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P.R. China
Jie Ding
State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P.R. China
Yonghai Zhang
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P.R. China; Shenzhen Research Institute of Xi'an Jiaotong University, Shenzhen, Guangdong, 518057, P.R. China

要約

To further enhance pool boiling heat transfer, a new oscillation device was proposed. An oscillating plate was located over the heater surface with a vertical oscillation amplitude of 20 mm and frequency of 6 Hz. Three N-type phosphorus-doped silicon chips were used as heater surfaces. One was a smooth surface, and the other two were micropin-finned chips with a fin side length of 30 μm and fin height of 60 μm (chip PF30-60), and the pin fins were arrayed with aligned and staggered arrangements, respectively. Absolute ethyl alcohol was used as a working fluid. The results showed that mechanical oscillation can enhance boiling heat transfer in both convective region and high heat flux region. The wall superheat showed a considerable decrease of 20-30°C in the convective region by thinning the thermal boundary layer on the heater surface, and the critical heat flux could also be increased by 20%. In addition, the micropin-finned chips showed better performance due to much more fresh liquid supply from the interconnected tunnels formed by micropin fins, which is driven by capillary force.


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