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Heat Transfer Research
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ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2017018690
pages 1179-1193

SINGLE-PHASE CONVECTIVE HEAT TRANSFER IN A CIRCULAR MINICHANNEL WITH UNSTEADY THERMAL LOADS

Makoto Shibahara
Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami, Higashinadaku, Kobe, 658-0022, Japan
K. Fukuda
Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami, Higashinadaku, Kobe, 658-0022, Japan
Qiusheng Liu
Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami, Higashinadaku, Kobe, 658-0022, Japan
K. Hata
Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami, Higashinadaku, Kobe, 658-0022, Japan

RESUMO

Transient forced-convection heat transfer coefficients were measured for water flowing in a circular minichannel with exponentially increasing heat input. A stainless steel tube (SUS 304) with an inner diameter of 1.0 mm and a length of 47.4 mm, mounted vertically in the experimental water loop, was used as the experimental tube. In the experiment, the upward flow velocity ranged from 10 to 16 m/s and the inlet temperature ranged from 301 to 319 K. The heat generation rate increased exponentially. The e-folding time ranged from 39 ms to 15 s. The experimental results indicated that the turbulent heat transfer coefficients of the minichannel increased with decreasing e-folding time and increasing flow velocity. When the e-folding time was shorter than approximately 0.1 s, the heat transfer coefficients were significantly higher. Correlations of the steady and transient heat transfer for water flowing in a stainless steel tube were obtained from experimental data.


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