ISSN Online: 2377-424X
ISBN Print: 0-85295-345-3
International Heat Transfer Conference 10
THE POOL NUCLEATE BOILING FLOW PATTERNS OF VERTICALLY ORIENTED, SMALL HEATERS BOILING ON ONE SIDE
Resumo
The pool nucleate boiling curve of a simulated chip
in saturated FC-72 at atmospheric pressure was divided
into different boiling subregimes based on the slope
changes and visual observations made at different heat
fluxes. Next, hot wire anemometry was used in order to
gain insight into the fine structure of the vapor flow
throughout the nucleate boiling regime. The void fraction
data obtained made it possible to suggest flow patterns for
each boiling subregime, especially in the vicinity of the
CHF, where the main focus lies. In addition, the analysis
of the hot wire signals allowed for the identification of the role played by vapor coalescence as the heat flux is
increased. Inferences were then made regarding the likely
CHF triggering mechanisms, based on the trends observed
in the boiling-curve and hot-wire data.