Experimental measurement of energy accommodation coefficient by low-pressure method

Hiroki Yamaguchi, Yuta Aoki, Kazuaki Kanazawa, yu Matsuda, Tomohide Niimi

研究成果: Conference contribution

1 引用 (Scopus)

抄録

Heat transfer in micro flows has received much attention along with the development in micro- and nano-technology. In micro- and nano-flow fields, the Knudsen number, which is defined as a ratio of the molecular mean free path to the characteristic length of the system, becomes large because of the small characteristic length. In these so-called "high Knudsen number flows", the number of the collision of gas molecules to the surface is much larger than that of intermolecular collisions. Therefore, it is important for the high Knudsen number flows to understand the gas-surface interaction. Since detailed science of the gas-surface interaction is complicated, the empirical parameter called the accommodation coefficient is widely used for flow analyses of the flows. In this study, the energy accommodation coefficient for metal surface has been measured experimentally by the Low-Pressure method, in which the energy accommodation coefficient is obtained from the pressure dependency of the heat flux in the free-molecular flow regime. It is not easy to realize the free-molecular flow condition, and, thus, the relation between the heat flux and the pressure extended to much higher pressure condition was employed in this study. Experimental geometry was designed as concentric cylinders, and heat flux between two cylinders, whose surface temperatures was different, was measured. Experimental results are reported for argon and oxygen in contact with a platinum surface. The surface temperature dependence of the energy accommodation coefficient was also studied, and verified by the results of previous work.

元の言語English
ホスト出版物のタイトルProceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009
ページ189-192
ページ数4
2
DOI
出版物ステータスPublished - 2010 7 12
外部発表Yes
イベントASME 2009 Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009 - Shanghai, China
継続期間: 2009 12 182009 12 21

Other

OtherASME 2009 Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009
China
Shanghai
期間09/12/1809/12/21

Fingerprint

Heat flux
Gases
Engine cylinders
Argon
Platinum
Nanotechnology
Flow fields
Metals
Oxygen
Heat transfer
Temperature
Molecules
Geometry

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

これを引用

Yamaguchi, H., Aoki, Y., Kanazawa, K., Matsuda, Y., & Niimi, T. (2010). Experimental measurement of energy accommodation coefficient by low-pressure method. : Proceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009 (巻 2, pp. 189-192) https://doi.org/10.1115/MNHMT2009-18238

Experimental measurement of energy accommodation coefficient by low-pressure method. / Yamaguchi, Hiroki; Aoki, Yuta; Kanazawa, Kazuaki; Matsuda, yu; Niimi, Tomohide.

Proceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009. 巻 2 2010. p. 189-192.

研究成果: Conference contribution

Yamaguchi, H, Aoki, Y, Kanazawa, K, Matsuda, Y & Niimi, T 2010, Experimental measurement of energy accommodation coefficient by low-pressure method. : Proceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009. 巻. 2, pp. 189-192, ASME 2009 Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009, Shanghai, China, 09/12/18. https://doi.org/10.1115/MNHMT2009-18238
Yamaguchi H, Aoki Y, Kanazawa K, Matsuda Y, Niimi T. Experimental measurement of energy accommodation coefficient by low-pressure method. : Proceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009. 巻 2. 2010. p. 189-192 https://doi.org/10.1115/MNHMT2009-18238
Yamaguchi, Hiroki ; Aoki, Yuta ; Kanazawa, Kazuaki ; Matsuda, yu ; Niimi, Tomohide. / Experimental measurement of energy accommodation coefficient by low-pressure method. Proceedings of the ASME Micro/Nanoscale Heat and Mass Transfer International Conference 2009, MNHMT2009. 巻 2 2010. pp. 189-192
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