This paper provides critical heat flux (CHF) to cause a burnout of the heated surface for flow boiling of water in a laterally non-uniformly heated round tube, which is encountered in various engineering equipments such as electronic devices and plasma facing components of a fusion reactor. CHF experiments were performed with a laterally non-uniformly (semi-circumferentially) heated round tube under low flow and low pressure conditions. The mechanism of burnout was also investigated in comparison with that in a uniformly heated round tube. It is well known that the burnout in a uniformly heated round tube occurs due to dryout of liquid film in the high quality region. On the other hand, it was found in the laterally non-uniformly heated round tube, that the burnout occurred when the flow regime changed from churn flow to annular flow, and the liquid film on the heated wall dried out. Since there still remained liquid film on the unheated wall, the burnout occurred in low or intermediate quality region.
Critical heat flux for water flowing in a laterally non-uniformly heated round tube
1997
7 Seiten, 13 Quellen
Conference paper
English
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