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Information × Registration Number 0214U001982, 0112U002105 , R & D reports Title Investigation of heat transfer while driving two-phase flows in pipes air-cooled condensers popup.stage_title Head Demchenko Vladimir, Registration Date 16-12-2014 Organization Institute of Engineering Thermophysics of the Ukrainian National Academy of Sciences popup.description2 The heat transfer of two-phase flow "liquid-vapor" within corrugated pipe was investigated which outside washed by cooling air with the purpose of determining the local flows (temperatures of local heat flow, the local heat transfer coefficients, etc.) as well as the effect of changing the attack angle of the air flow on the heat transfer ability of the heat exchange tube. The study used the combined method (theoretical and experimental). It was found that the currently heat transfer surfaces have reached their limit values for heat transfer, and a further increase in these parameters associated only with immoderate buildup of metal structures without a substantial increase in their efficiency. Showed the spectrum of mathematical relationships (Nusselt, Labuntsov, Prandtl, Hartmann) to describe the condensation processes and their ability to adapt to the mathematical description of condensation on the surface; showed the theoretical and experimental local heat transfer characteristics; shows the influence of the attack angle of the air flow on the local heat transfer characteristics. Found that the most effective attack angle is 75 ... 90 degrees. We are recommended the usage of corrugated pipes for the creation of new and modernization of existing air-cooled condenser. Product Description popup.authors Євтушенко О.В. Демченко В.Г. Драганов Б.Х. Дуняк О.В. Жовнорук Є.Г. Каменьков Г.Б Макаренко Л.А. Погорєлова Н.Д. Пойда С.О. Ракитянська Н.А. Фалько В.Ю popup.nrat_date 2020-04-02 Close