ISSN Online: 2377-424X
ISBN Print: 0-85295-345-3
International Heat Transfer Conference 10
NUCLEATE POOL BOILING ON OXIDIZED TUBES
Abstrakt
The effects of oxidation in nucleate pool boiling were
investigated. Water and a refrigerant (R-ll) were boiled on
commercially clean, and oxidized copper tubes. It was
observed that oxidation increases the nucleate pool boiling
heat transfer coefficient for both fluids. The boiling heat
transfer coefficient increases with increase in the level of
oxidation. A microphotograph examination of the oxidized
surface shows that oxidation tends to make the surfaces rougher and increased cavity sites and active nucleation sites were clearly observed during boiling. The contact angle of water on copper with different levels of oxidation was also measured. The contact angle was found to decrease with increase in the level of oxidization.