Boiling heat transfer from inclined surfaces is examined and an analytical model of bubble growth and nucleate boiling is presented. The model predicts the average heat flux during nucleate boiling by considering alternating near-wall liquid and vapor periods. It expresses the heat flux in terms of the bubble departure diameter, frequency and duration of contact with the heating surface. Experiments were conducted over a wide range of upward and downward-facing surface orientations and the results were compared to model predictions. More active microlayer agitation and mixing along the surface as well as more frequent bubble sweeps along the heating surface provide the key reasons for more effective heat transfer with downward facing surfaces as compared to upward facing cases. Additional aspects of the role of surface inclination on boiling dynamics are quantified and discussed.

Issue Section:
Boiling Condensation
Keywords:
Analytical, Boiling, Experimental, Heat Transfer
Topics:
Boiling, Bubbles, Dynamics (Mechanics), Evaporation, Heat flux, Heat transfer, Heating, Nucleate boiling, Nucleate pool boiling, Vapors
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