Abstract
This paper presents new experimental results for saturated nucleate boiling of FC72 and FC87 on a horizontal copper disc, at atmospheric pressure, for different degrees of confinement, s, in the range of 0.1–13 mm, and with two kinds of confining element, for low and moderated heat fluxes (⩽40 kW/m 2), on both a downward and an upward facing heating surface. For low heat flux a decrease of the confinement gap causes an enhancement of the boiling and a decrease in the dryout heat flux. A visualization of the boiling phenomenon shows the effect of confinement and heat flux on the liquid–vapor configuration.
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