Experimental studies have been done on falling film evaporation of water on four types of finned tubes arrays at the pressure of 1000 Pa. The Reynolds numbers are in the laminar range of about 10 to 110. Results show that the finned tubes that can distribute liquid longitudinally have the best performances in the partial dryout regime, and those with high fins could enhance heat transfer most in the fully wet regime. High heat fluxes will make more liquid evaporate, but also generate more dry patches on the tubes. Additionally, the inner enhancement of the tubes will also improve the overall heat transfer coefficients. And four heat transfer enhancement methods of falling film evaporation are summarized in the paper.

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