The annular flow is the predominant flow regime in the upper part of Boiling Water Reactor (BWR). It consists of a thin liquid coolant film on the fuel rods and a fast moving gas core between the fuel rods. The liquid phase extends to the gas core due to whisps and entrained droplets. As the liquid film removes heat from the fuel rods by evaporation cooling, it loses mass due to the phase transition. Droplets entrained in the gas core ...

ENGLISH VERSION Since many years, nanotechnology has been the area of science designated to deliver technological advancements that will change human lives for the better. Physicists dreamed about manipulating entities as small as single molecules or individual atoms. Only inventions like the atomic force microscope or constant improvement of already existing technologies such as in electron beam microscopy opened up ways to make ...