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Dropwise Condensation is a phase change process where vapor condenses into discrete droplets on a surface rather than forming a continuous film. This results in higher heat transfer rates compared to filmwise condensation. Surface properties and additives can promote dropwise condensation.

Critical Heat Flux (CHF) represents the maximum heat flux during nucleate boiling before the transition to film boiling occurs. Exceeding CHF leads to a rapid rise in surface temperature and decreased heat transfer efficiency. It's a crucial factor in designing heat exchangers and boiling systems.

Nucleate Boiling is characterized by the formation of vapor bubbles on heated surfaces below a liquid's bulk boiling point. It's efficient due to high heat transfer coefficients and occurs at surface temperatures just above the saturated liquid temperature. It's common in everyday heating and cooling systems.