.... The local results demonstrate an increase in condensate film thickness from a particular angular position, which is influenced by the vapor quality of the flow to the bottom of the pipe. The heat transfer coefficient decreases around the pipe circumference from the top to the bottom of the pipe. The results...

... liquid film would indeed increase the heat transfer; however, there may be an optimum liquid film thickness dictated by the system being used [ 11 ]. If a liquid film is too thin, it may lead to immediate dryout and there is a need to increase the spray mass flow rate in a controlled way to reach high...

.... The gas phase was air. The vertically oriented test section was a circular pipe of 30 mm in inner diameter and 5.4 m in length. The substrate thickness of the silicone films, the film Reynolds numbers of which were quite low, was close to the mean film thickness, while the water film substrate was much...