RT Journal Article ID 500749e22263a314 A1 Nazeer, Yasir Hayat A1 Ehmann, M. A1 Koukouvinis, P. A1 Gavaises, Manolis T1 THE INFLUENCE OF GEOMETRICAL AND OPERATIONAL PARAMETERS ON INTERNAL FLOW CHARACTERISTICS OF INTERNALLY MIXING TWIN-FLUID Y-JET ATOMIZERS JF Atomization and Sprays JO AAS YR 2019 FD 2019-09-04 VO 29 IS 5 SP 403 OP 428 K1 internally mixing twin-fluid Y-jet atomizer K1 compressible volume of fluid K1 large eddy simulations K1 multiphase flow regimes AB Internally mixing twin-fluid Y-jet atomizers are widely used in coal-fired thermal power plants for start-up, oil-fired thermal power plants, and industrial boilers. The flow through internally mixing Y-jet atomizers is numerically modeled using the compressible Navier-Stokes equations; wall modeled large eddy simulations (WMLES) are used to resolve the turbulence with large eddy simulations whereas the Prandtl mixing length model is used for modeling the subgrid scale structures, which are affected by geometric and operational parameters. Moreover, the volume-of-fluid (VOF) method is used to capture the development and fragmentation of the liquid-gas interface within the Y-jet atomizer. The numerical results are compared with correlations available in the open literature for the pressure drop; further results are presented for the multiphase flow regime maps available for vertical pipes. The results show that the mixing point pressure is strongly dependent on the mixing port diameter to air port diameter ratio, specifically for gas to liquid mass flow-rate ratio (GLR) in the range 0.1 < GLR < 0.4; the mixing port length moderately affects the mixing point pressure while the angle between mixing and liquid ports is found not to have an appreciable effect.Moreover, it is found that the vertical pipe multiphase flow regime maps in the literature could be applied to the flow through the mixing port of the twin-fluid Y-jet atomizer. The main flow regimes found under the studied operational conditions are annular and wispy-annular flow. PB Begell House LK https://www.dl.begellhouse.com/journals/6a7c7e10642258cc,340c691300746bb3,500749e22263a314.html