caa a22 4500 477093906 CHVBK 20180405111522.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF00193916 doi (NATIONALLICENCE)springer-10.1007/BF00193916 Rotating gas-liquid flows in finite cylinders: Sensitivity of standing vortices to end effects [Elektronische Daten] [P. Bandyopadhyay, M. Gad-el-Hak] The spiraling and straight gas-filled vortices formed by a rotating mixture of a gas and a liquid flowing through a finite-length cylinder are the subject of this paper. The working fluids considered are primarily helium and water. The bubbly liquid enters and leaves the cyclone-type separator tangentially. A gas-core vortex forms due to the resulting swirling motion of the mixture and, ideally, most of the gas leaves through an opening centered in the inlet end-wall of the vertical cylinder. The sensitivity of the gas-core configurations to the relative angle between the tangential inlet and outlet (φ) and to the length-to-diameter ratio of the cylinder (L/D) are investigated experimentally. Direct observations of the flow field are made using video and still cameras. The various gas-core vortex configurations are classified in a stability diagram. Although, as many as eight different types of core patterns have been identified, they are of two basic modes: straight and helical-spiral, or combinations of these. However, the straight mode is neither perfectly straight nor axisymmetric; it contains some non-uniformities. In an L/D-versus-φ plane, a linear ridge exists that is a sensitive stability line dividing the regimes of the straight and helical-spiral modes. The relationship between the two modes is examined, and the statistics of the wavelength and diameter of the helical spiral are given. A kinematic model is deducted and is used to explain the observed changes in the geometric parameters of the gas core. Springer-Verlag, 1996 Bandyopadhyay P. Naval Undersea Warfare Center, Weapons Technology and Undersea Systems Department, 02841, Newport, RI, USA aut Gad-el-Hak M. University of Notre Dame, Department of Aerospace and Mechanical Engineering, 46556, Notre Dame, IN, USA aut Experiments in Fluids Springer-Verlag 21/2(1996-06-01), 124-138 0723-4864 21:2<124 1996 21 348 https://doi.org/10.1007/BF00193916 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00193916 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bandyopadhyay P. Naval Undersea Warfare Center, Weapons Technology and Undersea Systems Department, 02841, Newport, RI, USA aut NATIONALLICENCE 700 1- Gad-el-Hak M. University of Notre Dame, Department of Aerospace and Mechanical Engineering, 46556, Notre Dame, IN, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer-Verlag 21/2(1996-06-01), 124-138 0723-4864 21:2<124 1996 21 348 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer