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We present a combined experimental-numerical study of the primary breakup of a single-phase attenuating liquid sheet emerging from a flat fan nozzle. An experimental setup has been built to produce flat fan liquid sheets/sprays at near industrial conditions, i.e. high pressure and turbulent. The process of sheet disintegration, for a transitional and a turbulent sheet, is visualized using high-speed shadowgraphy. The shadowgrams resolve features of the primary breakup at very fine spatial and temporal resolutions, revealing new information about attenuating liquid sheets. Three breakup mechanisms are identified in the central region of the sheet; two of these, aerodynamic instability and disruption by perforations, are well known. The third mechanism, bag breakup, appears not to have been previously reported in the context of flat fan sprays. Highly resolved Computational Fluid Dynamics (CFD) is employed to …