2023 Fiscal Year Research-status Report
A novel heat transfer enhancement method: Combination of Nano-encapsulated PCM and metal foam
| Project/Area Number |
22K03965
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| Research Institution | Shizuoka University |
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Principal Investigator |
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Keywords | Thermal enhancement / Nano-encapsulated PCM / Phase change materials |
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| Outline of Annual Research Achievements |
In the second year of the project, the study focused on the numerical works, before doing experiments in the third year. Firstly, the most important parameters affect the thermal performance of nano-encapsulated fluid for enhancement heat transfer is investigated. It was found that the temperature difference between the inlet temperature and melting / freezing temperature play an important role on the thermal performance. The aspect ratio of the channel is the second important parameter affect the thermal performance. As expected, the nanoparticle concentration is the next parameter. The effects of all of them were investigated and published in a conference paper. It is found that the boundary layer occurs on the surface is the main thermal resistance causing decreasing of thermal performance. Therefore, the attention focused on the destroying the boundary layer and ribs were selected as an effective tool for the destroying boundary layer. It mixes the fluid and causing the faster melting or freezing of NEPCM. Therefore, even in a very short distance, the possibility of high heat transfer exists. Our results showed that the use of ribs with NEPCM can enhance heat transfer by 45% for a channel with Re = 100. Now, the study is focused on multiple ribs and will continue with other shapes of ribs and the effect of aforementioned parameters will be studied as well as experimental study will be done to validate numerical results.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
We have difficulties with experimental works. Measuring the effect of heat transfer enhancement for the nano-encapsulated PCM is not easy and requires very accurate devices. Furtehrmore, we have also difficulties for supplying the high function NEPCM.
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| Strategy for Future Research Activity |
The research plan for 2024 can be described as follows.
a) Study on the ribs for destroying boundary layer continues. The aim is to enhance heat transfer more and more with minimum pressure drop, b) searching for more suitable NEPCM continues, c) experiments will continue to validate the obtained numerical results, d) the results will be published in a journal and present in a conference, e) the project will be finalized.
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| Causes of Carryover |
We could not continue with detailed experimental studies, and we postponed experiments to the next year (2024). This money will be used for experimental studies and finalize it in 2024.
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