A simplified model, based on heat transfer through a wedge-shaped liquid microlayer and a lumped thermal analysis for a solid heater, is developed for predicting the vapor bubble growth rate in heterogeneous pool boiling. A first-order ordinary differential equation is obtained for the bubble growth rate. An empirical parameter, C2, which characterizes the region of the heating surface influenced by microlayer evaporation, is determined by matching the existing experimental data with the predicted growth rate. The present bubble growth model compares well with the available experimental data for intermediate and moderately wetting fluids in which Jacob number ranges from 0.52 to 1974.

Issue Section:
Boiling and Condensation
Keywords:
Boiling, Transient and Unsteady Heat Transfer
Topics:
Boiling, Bubbles, Heat transfer, Vapors, Differential equations, Evaporation, Fluids, Heating, Pool boiling, Thermal analysis, Transients (Dynamics), Wedges, Wetting
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 by The American Society of Mechanical Engineers
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