水平管内を流動するスラッシュ窒素の圧力損失低減および伝熱劣化特性に関する研究

• 大平 勝秀

  東北大学　流体科学研究所　極低温流研究分野

• 中込 圭

  東北大学　流体科学研究所　極低温流研究分野

• 高橋 則史

  北海道電力（株）　泊発電所

書誌事項

タイトル別名

• Pressure-drop Reduction and Heat-transfer Deterioration of Slush Nitrogen in Horizontal Pipe Flow
• スイヘイ カンナイ オ リュウドウ スル スラッシュ チッソ ノ アツリョク ソンシツ テイゲン オヨビ デンネツ レッカ トクセイ ニ カンスル ケンキュウ

抄録

Cryogenic slush fluids such as slush hydrogen and slush nitrogen are two-phase, single-component fluids containing solid particles in a liquid. Since their density and refrigerant capacity are greater than those of liquid-state fluid alone, there are high expectations for the use of slush fluids in various applications such as clean-energy fuels, fuels for spacecraft to improve the efficiency of transportation and storage, and as refrigerants for high-temperature superconducting equipment. Experimental tests were performed using slush nitrogen to obtain the flow and heat-transfer characteristics in two different types of horizontal circular pipes with inner diameters of 10 and 15 mm. One of the primary objectives for the study was to investigate the effect of pipe diameter on the pressure-drop reduction and heat-transfer deterioration of slush nitrogen according to changes in the pipe flow velocity, solid fraction and heat flux. In the case of an inner diameter of 15 mm, pressure drop was reduced and heat-transfer characteristics deteriorated when the pipe flow velocity was higher than 3.6 m/s. On the other hand, in the case of an inner diameter of 10 mm, pressure drop was reduced and heat-transfer characteristics deteriorated when the pipe flow velocity was higher than 2.0 m/s. From these results, it can be seen that a larger pipe diameter produces a higher onset velocity for reducing pressure drop and deteriorating heat-transfer characteristics. Furthermore, based on observations using a high-speed video camera, it was confirmed that pressure drop was reduced and heat-transfer characteristics deteriorated when the solid particles migrated to the center of the pipe and the flow pattern of the solid particles inside the pipe was pseudo-homogeneous.

収録刊行物

• 低温工学

  低温工学 46 (3), 149-161, 2011

  公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)

キーワード

• slush nitrogen
• pressure-drop reduction
• heat-transfer deterioration
• two-phase flow
• hydrogen energy

詳細情報

• CRID: 1390282679589263232
• NII論文ID: 10027961826
• NII書誌ID: AN00333419
• DOI: 10.2221/jcsj.46.149
• ISSN: 18800408
• ISSN: 03892441
• NDL書誌ID: 11076211
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I11076211
• 本文言語コード: ja
• データソース種別:
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• 抄録ライセンスフラグ: 使用不可