THE MECHANISM OF AUGMENTATION HEAT TRANSFER AT HIGH PERFORMANCE BOILING SURFACES
| Project/Area Number |
63460101
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thermal engineering
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
ITO Takehiro KYUSHU UNIV. FAC.OF ENG. PROFESSOR, 工学部, 教授 (20037740)
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| Co-Investigator(Kenkyū-buntansha) |
KUBOTA Hiromi KYUSHU UNIV. FAC.OF ENG. RESEARCH ASSOCIATE, 工学部, 助手 (10117103)
TANAKA Katsunori KYUSHU UNIV. FAC.OF ENG. RESEARCH ASSOCIATE, 工学部, 助手 (40037833)
TAKATA Yasuyuki KYUSHU UNIV. FAC.OF ENG. ASSOCIATE PROFESSOR, 工学部, 助教授 (70171444)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 1989: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1988: ¥3,000,000 (Direct Cost: ¥3,000,000)
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| Keywords | High Performance Surfaces / Augmentation / Nucleate Boiling / Porous Layer |
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| Research Abstract |
1. Test on basic characteristic at porous surfaces
(1) ALN spattered surface
The experiment has performed on pool nucleate boiling from ALN spattered sur faces to three test fluids of R113, R12 and N_2, then the results were compared with the analysis proposed earlier [1]. The particle diameter of this porous layer, which can be applied at this moment, is so small that the performance is unsatisfactory.
(2) Sintered layer of bronze particle
An experimental surface designed for an optimum structure was tested for boiling liquids R12 and N_2. Discussions of the augmentation characteristics have been made based on the results of experimentation and analysis.
(3) Aluminum plasma splayed surface
Aluminum particles coated surface was made with plasma splay method. This porous surface, of particle diameter 70[mum], was highly effective in boiling liquid N_2. Ensuring a well defined void space and preparing a layer of large particles are difficult technically at the process available.
2. Analysis of the heat transfer process at the porous layer and proposal of heat transfer correlation
The effects of the particle diameter and the thickness of the sintered layer on nucleate boiling heat transfer are discussed. Making use of the burnout heat flux as a scaling factor, we have proposed a model of augmentation performance.
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Report
(3 results)
Research Products
(9 results)
