Pool boiling heat transfer of a copper microporous coating in borated water
| Autor: | Juan C. Godinez, Hwan Yeol Kim, Seongchul Jun, Seung M. You |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
020209 energy chemistry.chemical_element Sintering 02 engineering and technology Heat transfer coefficient engineering.material 030218 nuclear medicine & medical imaging Nucleate boiling heat transfer Boric acid 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Coating 0202 electrical engineering electronic engineering information engineering Microporous coating Critical heat flux Boreated water Microporous material Copper lcsh:TK9001-9401 Nuclear Energy and Engineering chemistry Chemical engineering engineering lcsh:Nuclear engineering. Atomic power Nucleate boiling |
| Zdroj: | Nuclear Engineering and Technology, Vol 52, Iss 9, Pp 1939-1944 (2020) |
| ISSN: | 1738-5733 |
| Popis: | Pool boiling heat transfer of a copper microporous coating was experimentally studied in borated water with a concentration of boric acid from 0.0 to 5.0 vol percent (vol%) to determine the effect of boric acid on boiling heat transfer in water. A high-temperature, thermally conductive microporous coating (HTCMC) was created by sintering copper powder with an average particle size of 67 μm onto a 1 cm × 1 cm plain copper surface with a coating thickness of ~300 μm within a furnace in a vacuum environment. The tests showed that the nucleate boiling heat transfer coefficient (NBHT) of HTCMC became slightly less enhanced as the concentration of boric acid increased but the NBHT coefficient values were still significantly higher than those of the plain surface. The critical heat flux (CHF) values from 0 to 1.0 vol% were maintained at ~2,000 kW/m2, and then, they gradually decreased down to ~1,700 kW/m2 as the concentration increased further to 5.0 vol%. It is believed that the micro-scale pores of the HTCMC were partially blocked by the high boric acid concentration during the nucleate boiling such that the small bubbles were not effectively created using the HTCMC reentrant cavities as the boric acid concentration increased. |
| Databáze: | OpenAIRE |
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