Study of gas-sheared liquid film in horizontal rectangular duct using high-speed LIF technique: Three-dimensional wavy structure and its relation to liquid entrainment

Three-dimensional investigation of liquid film structure at the initial area of annular-dispersed flow

“…As a result, the transverse coherence is regained gradually. This is in agreement to the observations of the paper [1], though further downstream this increase may also occur due to coalescence of narrower disturbance waves to form wider waves, as it was noticed in [4]. Fig.…”

“…Besides, it would be difficult to completely eliminate optical distortions appearing due to the curvature of the pipe [3]. It was recently shown [4] that the wavy structure of gas-sheared films is qualitatively the same in channels of different shape, size and orientation. Thus, it was considered that investigation of 3D-evolution of waves near the inlet would be more comprehensive in a rectangular duct which provides clear optical access to the whole width of the channel (Fig.…”

Estimation of the radioactive aerosols capture in accidental sequences of nuclear power plants

“…The velocity, width and curvature of the ripple waves generated in a disturbance wave vary markedly in the same "mother wave", but at higher gas velocities the ripple waves are narrower and more curved .On average the velocities of these "fast ripple waves" are about 20 -30 % faster than the average velocity of the "mother disturbance waves" [Cherdantsev, 2014].…”

“…As far as high speed gaseous jets is concerned, it has been supposed an analogous behavior, i.e., the disturbance waves are the dominant but small ripple waves exists too. Many recent studies with high spatial resolution [Alekseenko, 2009[Alekseenko, & 2015Setyawan, 2014;Cherdantsev, 2014;Dasgupta, 2017] confirm that disturbance waves are much more complex than a simply wave and the importance of the ripple waves. The disturbance waves are covered by ripple waves than can travel at a slower or faster velocity than the mother disturbance wave [Cherdantsev, 2014;Alekseenko, 2009].…”

“…Although recent studies [Cherdantsev, 2014] link the droplet entrainment process to the presence of "fast ripple waves". According to Chervantsev et al three different mechanisms are possible to cause droplet entrainment: secondary entrainment, bag breakup and ligament break-up.…”