Boiling Heat Transfer and Pressure Drop of a Refrigerant Flowing Vertically Upward in a Small Diameter Tube
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- MIYATA Kazushi
- Department of Mechanical Engineering Science, Graduate School, Kyushu University
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- MORI Hideo
- Department of Mechanical Engineering Science, Kyushu University
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- OHISHI Katsumi
- Department of Mechanical Engineering Science, Kyushu University
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- TANAKA Hirokazu
- Department of Mechanical Engineering Science, Kyushu University
Bibliographic Information
- Other Title
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- 垂直細管内上昇流の沸騰熱伝達と圧力損失
- スイチョク サイカンナイ ジョウショウリュウ ノ フットウ ネツ デンタツ ト アツリョク ソンシツ
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Abstract
In the present study, experiments were performed to examine characteristics of flow boiling heat transfer and pressure drop of a refrigerant R410A flowing vertically upward in a copper smooth tube with 1.0 mm inside diameter for the development of a high-performance heat exchanger using small diameter tubes for air conditioning systems. Local heat transfer coefficients were measured in a range of mass fluxes from 30 to 200 kg/(m2•s), heat fluxes from 1 to 16 kW/m2 and qualities from 0.1 to over 1 at evaporation temperature of 10°C, and pressure drops were also measured at mass fluxes of 100 and 200 kg/(m2•s) and qualities from 0.1 to 0.9. Three types of flow pattern were observed in the tube: A slug, a slug-annular and an annular flow. Based on the measurements, the characteristics of frictional pressure drop, heat transfer coefficient and dryout qualities were clarified. The measured pressure drop and heat transfer coefficient were compared with correlations.
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 24 (4), 359-369, 2007
Japan Society of Refrigerating and Air Conditioning Engineers
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Keywords
Details 詳細情報について
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- CRID
- 1390001204666998272
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- NII Article ID
- 10020129365
- 130004566109
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- NII Book ID
- AA11125910
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- COI
- 1:CAS:528:DC%2BD1cXkt1KmsL8%3D
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- ISSN
- 2185789X
- 13444905
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- NDL BIB ID
- 9347610
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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