Condensate Flow Modes and Condensation Heat Transfer of R245fa on Horizontal Enhanced Surface Tubes
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- MATSUNO Tomonobu
- Course of Marine System Engineering, Graduate School of Marine Science and Technology,Tokyo University of Marine Science and Technology
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- NOGUCHI Terutaka
- Division of Marine Technology, Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
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- JIGE Daisuke
- Division of Marine Technology, Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
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- INOUE Norihiro
- Division of Marine Technology, Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
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- TAKAHASHI Hiroyuki
- Hatano Plant, Kobelco & Materials Copper Tube, LTD.
Bibliographic Information
- Other Title
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- 冷媒R245fa の水平加工管上での凝縮様相および凝縮熱伝達
- レイバイ R245fa ノ スイヘイ カコウカン ジョウ デ ノ ギョウシュク ヨウソウ オヨビ ギョウシュク ネツ デンタツ
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Description
The present study experimentally investigated the condensation heat transfer characteristics, condensate flow modes, and condensate flooding angle of R245fa on horizontal low-finned and microscopic-grooved tubes. Seven low-finned and three microscopic-grooved tubes with tube diameters of approximately 19 mm at the fin tip were used as the test tubes. Experiments were conducted at a constant saturation temperature of 40 °C. Three condensate flow modes—droplet mode, droplet-column mode, and column mode—were observed in this experiment. The transition film Reynolds number of the condensate flow mode of the low-finned tubes was different from that of the condensate flow mode of the microscopic-grooved tubes. The condensate flow mode of the microscopic-grooved tubes transited from droplet mode to droplet-column mode had a lower film Reynolds number than that of the low-finned tubes. The condensation heat transfer characteristics of the low-finned and microscopic-grooved tubes were experimentally investigated to clarify the condensate flow modes and the effects of fin pitch, fin height, and fin geometries on the condensate flooding angle and condensation heat transfer.
Journal
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- Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers
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Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers 31 (4), 415-422, 2014
Japan Society of Refrigerating and Air Conditioning Engineers
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Details 詳細情報について
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- CRID
- 1390001204666055936
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- NII Article ID
- 130005116601
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- NII Book ID
- AA11125910
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- ISSN
- 2185789X
- 13444905
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- NDL BIB ID
- 026023035
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed