Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink
A concentric annular heat pipe heat sink (AHPHS) was proposed and fabricated to investigate its thermal behavior. The present AHPHS consists of two concentric pipes of different diameters, which create vacuumed annular vapor space. The main advantage of the AHPHS as a heat sink is that it can largel...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/20/5282 |
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| author | Eui-Hyeok Song Kye-Bock Lee Seok-Ho Rhi Kibum Kim |
| author_facet | Eui-Hyeok Song Kye-Bock Lee Seok-Ho Rhi Kibum Kim |
| author_sort | Eui-Hyeok Song |
| collection | DOAJ |
| description | A concentric annular heat pipe heat sink (AHPHS) was proposed and fabricated to investigate its thermal behavior. The present AHPHS consists of two concentric pipes of different diameters, which create vacuumed annular vapor space. The main advantage of the AHPHS as a heat sink is that it can largely increase the heat transfer area for cooling compared to conventional heat pipes. In the current AHPHS, condensation takes place along the whole annular space from the certain heating area as the evaporator section. Therefore, the whole inner space of the AHPHS except the heating area can be considered the condenser. In the present study, AHPHSs of different diameters were fabricated and studied experimentally. Basic studies were carried out with a 50 mm-long stainless steel AHPHS with diameter ratios of 1.1 and 1.3 and the same inner tube diameter of 76 mm. Several experimental parameters such as volume fractions of 10–70%, different air flow velocity, flow configurations, and 10–50 W heat inputs were investigated to find their effects on the thermal performance of an AHPHS. Experimental results show that a 10% filling ratio was found to be the optimum charged amount in terms of temperature profile with a low heater surface temperature and water as the working fluid. For the methanol, a 40% filling ratio shows better temperature behavior. Internal working behavior shows not only circular motion but also 3-D flow characteristics moving in axial and circular directions simultaneously. |
| first_indexed | 2024-03-10T15:42:53Z |
| format | Article |
| id | doaj.art-d2560f803e3e47528388b1c3c6f959e8 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T15:42:53Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-d2560f803e3e47528388b1c3c6f959e82023-11-20T16:42:40ZengMDPI AGEnergies1996-10732020-10-011320528210.3390/en13205282Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat SinkEui-Hyeok Song0Kye-Bock Lee1Seok-Ho Rhi2Kibum Kim3School of Mechanical Engineering, Chungbuk National University, 1 ChungDae-ro, SeoWon-gu, Cheongju, Chungbuk 28644, KoreaSchool of Mechanical Engineering, Chungbuk National University, 1 ChungDae-ro, SeoWon-gu, Cheongju, Chungbuk 28644, KoreaSchool of Mechanical Engineering, Chungbuk National University, 1 ChungDae-ro, SeoWon-gu, Cheongju, Chungbuk 28644, KoreaSchool of Mechanical Engineering, Chungbuk National University, 1 ChungDae-ro, SeoWon-gu, Cheongju, Chungbuk 28644, KoreaA concentric annular heat pipe heat sink (AHPHS) was proposed and fabricated to investigate its thermal behavior. The present AHPHS consists of two concentric pipes of different diameters, which create vacuumed annular vapor space. The main advantage of the AHPHS as a heat sink is that it can largely increase the heat transfer area for cooling compared to conventional heat pipes. In the current AHPHS, condensation takes place along the whole annular space from the certain heating area as the evaporator section. Therefore, the whole inner space of the AHPHS except the heating area can be considered the condenser. In the present study, AHPHSs of different diameters were fabricated and studied experimentally. Basic studies were carried out with a 50 mm-long stainless steel AHPHS with diameter ratios of 1.1 and 1.3 and the same inner tube diameter of 76 mm. Several experimental parameters such as volume fractions of 10–70%, different air flow velocity, flow configurations, and 10–50 W heat inputs were investigated to find their effects on the thermal performance of an AHPHS. Experimental results show that a 10% filling ratio was found to be the optimum charged amount in terms of temperature profile with a low heater surface temperature and water as the working fluid. For the methanol, a 40% filling ratio shows better temperature behavior. Internal working behavior shows not only circular motion but also 3-D flow characteristics moving in axial and circular directions simultaneously.https://www.mdpi.com/1996-1073/13/20/5282annular heat pipeheat sinkcoolingelectronics |
| spellingShingle | Eui-Hyeok Song Kye-Bock Lee Seok-Ho Rhi Kibum Kim Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink Energies annular heat pipe heat sink cooling electronics |
| title | Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink |
| title_full | Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink |
| title_fullStr | Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink |
| title_full_unstemmed | Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink |
| title_short | Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink |
| title_sort | thermal and flow characteristics in a concentric annular heat pipe heat sink |
| topic | annular heat pipe heat sink cooling electronics |
| url | https://www.mdpi.com/1996-1073/13/20/5282 |
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