ISSN Online: 2377-424X
ISBN Print: 0-85295-345-3
International Heat Transfer Conference 10
A NEARLY THEORETICAL MODEL FOR FULLY DEVELOPED NUCLEATE BOILING OF SATURATED LIQUIDS
Resumo
A nearly theoretical model for heat transfer at high
wall superheats or in fully developed nucleate boiling of a
saturated liquid is proposed. It is hypothesized that the
heat transfer in this region takes place mainly due to the
evaporation occurring at the periphery of the vapor stems,
which are formed within a liquid macro/micro layer and
are located on active nucleation sites. Thus if the evaporative
heat flux at a single vapor stem and nucleation site
density are known, the fully developed nucleate boiling
heat flux can be determined. In the present work, Wang
and Dhir's model for active nucleation site density and
the vapor stem model were exercised to determine the dependence
of fully developed nucleate boiling heat flux on
wall superheat. The prediction from the model shows a
good agreement with the data obtained on vertical and
horizontal copper plates submerged in a pool of saturated
water. The effect of system pressure on the prediction of
fully developed nucleate boiling heat flux is also discussed.