An array of impinging jets is characterized by high heat removal capability. As such it is used as a cooling technique in various industrial applications, i.e. paper drying, turbine blades cooling etc. The objective of the current study is to analyze the coherent structures in the interaction region of impinging jets and relate them to the local heat transfer. Since they play the major role in the local heat enhancement, their proper identification is crucial for the understanding of the heat transfer mechanisms. Three different methods for identification of flow structures in the jet interaction region are discussed in the paper. Heat transfer capability of different jet arrangements (in-line and hexagonal) are compared and analyzed in the context of flow structures comparison. The numerical simulations were performed with the CFD code ANSYS-CFX, solving Reynolds Averaged Navier-Stokes Equations (RANS approach). For the turbulence modeling Shear Stress Transport (SST) turbulence model was used.

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