書誌事項
- タイトル別名
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- Two-Phase Pressure Drop of a Refrigerant Flowing Vertically Downward in a Mini-channel
- レイバイ ノ ビサイ リュウロ ナイ スイチョク カコウキエキ ニソウリュウ ノ アツリョク ソンシツ
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Experiments were performed on two-phase pressure drop of a refrigerant R-410A flowing vertically downward in small copper circular tubes with 0.5-2.0 mm I.D., and small copper rectangular and triangular tubes with 1.04 and 0.88 mm inner hydraulic equivalent diameter, respectively, for the development of a high-performance heat exchanger using small tubes or multi-port extruded tubes for air conditioning systems.Pressure drops were measured and flow patterns were observed in the range of mass flux from 30 to 400 kg/(m2s)and quality from 0.1 to 0.9 at the saturation temperature of 10 °C. Characteristics of measured pressure drops were examined for different flow channel geometries. In high quality region or relatively high mass flux condition, the frictional pressure drop was reproduced well by the Lockhart-Martinelli correlation used together with a new correlation for Chisholm's parameter C as a function of hydraulic equivalent diameter. In low mass flux and low quality region, the frictional pressure drop was also reproduced well by multiplying the Chisholm two-phase multiplier factor by modified coefficient. In addition, flow pattern was observed with 0.5 and 2.0 mm I.D circular glass tubes. Slug flow and annular flow patterns were observed at lower and higher quality, respectively.
収録刊行物
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- 日本冷凍空調学会論文集
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日本冷凍空調学会論文集 26 (3), 335-346, 2009
公益社団法人 日本冷凍空調学会
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詳細情報 詳細情報について
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- CRID
- 1390001204664993664
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- NII論文ID
- 130004566177
- 10025392160
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- NII書誌ID
- AA11125910
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- COI
- 1:CAS:528:DC%2BC3cXjsVymug%3D%3D
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- ISSN
- 2185789X
- 13444905
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- NDL書誌ID
- 10452461
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
