Conductive heat transfer in a gas confined between two concentric spheres: From free-molecular to continuum flow regime

H. Yamaguchi*, M. T. Ho, Y. Matsuda, T. Niimi, I. Graur

*この研究の対応する著者

研究成果: Article査読

11 被引用数 (Scopus)

抄録

The conductive heat transfer through a gas confined between two concentric spherical shells maintained at different temperatures is investigated from the free-molecular to the continuum flow regime. The heat flux, measured using a recently proposed experimental system to extract the thermal accommodation coefficient, is compared with analytical expressions and numerical results. From this comparison it is found that in the free-molecular flow limit, the experimental data are well explained by the analytical expression for the arbitrary radius and temperature ratios of the spherical surfaces. In the continuum limit, the temperature dependence of the thermal conductivity coefficient should be considered in the analytical expression. In the transitional flow regime, a revised function for the heat flux interpolation is proposed to give better fitting to the numerical results. By employing these knowledge, the thermal accommodation coefficient extraction procedure for the system is revised, and it is shown that the re-calculated accommodation coefficient allows to reproduce well the measured heat flux.

本文言語English
ページ(範囲)1527-1534
ページ数8
ジャーナルInternational Journal of Heat and Mass Transfer
108
DOI
出版ステータスPublished - 2017
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学
  • 機械工学
  • 流体および伝熱

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