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Traditionally, circular orifices have been used for generating aerosols,however in recent times non-circular orifices are being considered due to theirsuperior atomization and mixing features. In this work, we experimentallyinvestigate spray morphology and drop size characteristics of kerosene (JetA-1) jets issuing from three non-circular orifices geometries (elliptic,triangular and, square) and one circular orifice with the same exit crosssectional area. Our results show an unexpected and yet unreported coarsening ofatomization for non-circular orifice jets quantified by an increase in theSauter Mean Diameter (SMD) at all tested exit velocities represented by theliquid Weber number, $We_l$. We attribute this to two distinct spraymorphologies: filament and core breakup which generate large size liquidstructures identified as filaments and ligaments, noticeable in non-circularorifices jets compared to circular orifice jets. On exploring this further byundertaking an examination of the drop size volume probability distribution atlower $We_l$ corresponding to the location marking the end of primary breakupwe see a bimodality due to a dominant distribution of fragments of small andlarger sizes owing to the spray morphology. At higher $We_l$ and largerdistances from the injector exit we observe the bimodality converts to aunimodal distribution for all orifice jets with a single peak situated at lowerdrop diameters. Filament breakup is reasoned to be the cause of higher numberof smaller drop sizes in triangular sprays among all non-circular orifice jetswhile thinner filaments in circular orifice sprays lead to smaller drop sizescompared to their triangular counterparts showing the same breakup morphology.We expect our results to help applications as diverse as engine fuelcombustion, pharmaceutical sprays and CO$_2$ capture by NaOH sprays.

Drop size characteristics of sprays emanating from circular and non-circular orifices in the atomization regime