Transient heat transfer of helium gas for forced convective flow through a narrow tube with different lengths
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- SUZUO Narihiro
- Department of Marine Engineering, Graduate School of Maritime Sciences, Kobe University
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- LIU Qiusheng
- Department of Marine Engineering, Graduate School of Maritime Sciences, Kobe University
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- SHIBAHARA Makoto
- Department of Marine Engineering, Graduate School of Maritime Sciences, Kobe University
抄録
<p>The understanding of the heat transfer process for helium gas cooling in the fusion blanket is important for the development of fusion reactors. This research aims at clarifying the transient heat transfer characteristics of helium gas for turbulent flow in a narrow tube. A circular platinum tube with an inner diameter of 1.8 mm was heated by exponentially increasing heat inputs and cooled by helium gas. The lengths of the tube were 30 mm and 50 mm. The heat transfer coefficients gradually increased for the e-folding time shorter than about 1.5 s. This shows that the heat transfer process is in a transient state for this region. The heat transfer coefficients increased with the increase of flow velocity, and the effect of the flow velocity became weak in the transient state region. By comparing with the experimental results of tube with different lengths, it was obtained that the quasi-steady state heat transfer coefficients for the length of 30 mm were higher than those for the lengths of 50 mm and 90 mm. However, the heated length showed a weak influence for the lengths of 30 mm and 50 mm in the transient heat transfer with a relatively smaller e-folding time. The variation of transient Nusselt number with Fourier number at different Reynolds number describes well the trend for the variation of heat transfer coefficient with e-folding time at different velocities. Based on the experimental data, an empirical correlation was obtained for transient heat transfer at different lengths by using Fourier number.</p>
収録刊行物
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- Mechanical Engineering Journal
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Mechanical Engineering Journal 11 (2), 23-00372-23-00372, 2024
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390018351897927552
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- ISSN
- 21879745
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- HANDLE
- 20.500.14094/0100488640
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- IRDB
- Crossref
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- 抄録ライセンスフラグ
- 使用不可