Convective boiling and condensation in enhanced tubes produced by selective laser melting
This project presents a study on condensation and boiling of R407c inside enhanced tubes fabricated by Selective Laser Melting. The results are compared against a plain SLM tube. The design of the four tubes are five long circumferential pin fins, eight short circumferential pin fins, twisted pin fi...
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| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2018
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| Online Access: | http://hdl.handle.net/10356/74946 |
| _version_ | 1824455871018565632 |
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| author | Tan, Choon Yong |
| author2 | Leong Kai Choong |
| author_facet | Leong Kai Choong Tan, Choon Yong |
| author_sort | Tan, Choon Yong |
| collection | NTU |
| description | This project presents a study on condensation and boiling of R407c inside enhanced tubes fabricated by Selective Laser Melting. The results are compared against a plain SLM tube. The design of the four tubes are five long circumferential pin fins, eight short circumferential pin fins, twisted pin fins and a metallic foam structure. For condensation, the vapour qualities at the inlet and outlet were maintained at 0.9 and 0.3, respectively whereas for boiling, the vapour qualities at the inlet and outlet were maintained at 0.2 and 0.8, respectively. Factors that affects the heat transfer coefficient such as fin height, refrigerant flow direction and mass flux were studied. The results show that saturation pressure, vapour quality, mass flux, refrigerant flow direction and effective heat exchange area have an impact on both condensation and boiling heat transfer. The eight-fin tube showed the highest condensation heat transfer coefficient while the metallic foam tube exhibited the highest boiling heat transfer coefficient. Interestingly, the metallic foam demonstrated poorer condensation heat transfer coefficient although it has the highest heat transfer area. |
| first_indexed | 2025-02-19T03:45:05Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/74946 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:45:05Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/749462023-03-04T18:48:59Z Convective boiling and condensation in enhanced tubes produced by selective laser melting Tan, Choon Yong Leong Kai Choong Wong Teck Neng School of Mechanical and Aerospace Engineering DRNTU::Engineering DRNTU::Engineering::Mechanical engineering This project presents a study on condensation and boiling of R407c inside enhanced tubes fabricated by Selective Laser Melting. The results are compared against a plain SLM tube. The design of the four tubes are five long circumferential pin fins, eight short circumferential pin fins, twisted pin fins and a metallic foam structure. For condensation, the vapour qualities at the inlet and outlet were maintained at 0.9 and 0.3, respectively whereas for boiling, the vapour qualities at the inlet and outlet were maintained at 0.2 and 0.8, respectively. Factors that affects the heat transfer coefficient such as fin height, refrigerant flow direction and mass flux were studied. The results show that saturation pressure, vapour quality, mass flux, refrigerant flow direction and effective heat exchange area have an impact on both condensation and boiling heat transfer. The eight-fin tube showed the highest condensation heat transfer coefficient while the metallic foam tube exhibited the highest boiling heat transfer coefficient. Interestingly, the metallic foam demonstrated poorer condensation heat transfer coefficient although it has the highest heat transfer area. Bachelor of Engineering (Mechanical Engineering) 2018-05-25T04:21:39Z 2018-05-25T04:21:39Z 2018 Final Year Project (FYP) http://hdl.handle.net/10356/74946 en Nanyang Technological University 77 p. application/pdf |
| spellingShingle | DRNTU::Engineering DRNTU::Engineering::Mechanical engineering Tan, Choon Yong Convective boiling and condensation in enhanced tubes produced by selective laser melting |
| title | Convective boiling and condensation in enhanced tubes produced by selective laser melting |
| title_full | Convective boiling and condensation in enhanced tubes produced by selective laser melting |
| title_fullStr | Convective boiling and condensation in enhanced tubes produced by selective laser melting |
| title_full_unstemmed | Convective boiling and condensation in enhanced tubes produced by selective laser melting |
| title_short | Convective boiling and condensation in enhanced tubes produced by selective laser melting |
| title_sort | convective boiling and condensation in enhanced tubes produced by selective laser melting |
| topic | DRNTU::Engineering DRNTU::Engineering::Mechanical engineering |
| url | http://hdl.handle.net/10356/74946 |
| work_keys_str_mv | AT tanchoonyong convectiveboilingandcondensationinenhancedtubesproducedbyselectivelasermelting |