METHANOL FLOW BOILING OVER A NONUNIFORMLY HEATED SURFACE

This work had experimentally investigated the stability characteristic s of nucleate and film boiling modes of methanol flowing over a nonuni formly heated flat plate. An axial (discrete) heat flux versus surface temperature distribution at which nucleate and film boiling can coexi st steadily is identified at atmospheric and subatmospheric presssures and three liquid crossflow rates. Below this distribution, nucleate b oiling mode is more stable; while above which, film boiling is more st able. Effects of system pressure and liquid crossflow rate were report ed. This work discussed the co-existing heat fluxes and suggested the existence of a unique rather than two transition boiling curves, to th e latter that is generally accepted in the literature, on a conductive ly heated surface.