Numerical Investigation on Heat Transfer Characteristics of a Mist Cooled Ribbed Channel with Different Rib Angle
DOI:
https://doi.org/10.38032/scse.2025.3.154Keywords:
Numerical Simulation, Ribbed Channel, Turbine Blade, Conjugate Heat Transfer, Heat Transfer EnhancementAbstract
The present work focuses on numerical analysis of a mist cooled rib channel with baffle in an internal cooling of a turbine blade. In this paper, flow and heat transfer characteristics are presented for rib channel with baffle at different angle of ribs that is used as internal cooling passage of turbine blades. ANSYS Workbench software is employed to measure surface heat transfer characteristics and friction factor over the ribbed surfaces in the designed ribbed channel with baffle. Using different boundary conditions, a mist cooled rib channel with baffle is validated for better Heat Transfer Characteristics, Friction factor and pressure profiles. The fundamental goal is to describe the heat transfer performance at different values of Reynolds Number, Prandtl Number with variation of rib angle. Besides this to calculate the friction factors at different values of Reynolds Number, Prandtl Number and rib angle. Increase of Reynolds Number increases the Nusselt Number. Increase of Rib angle increases Nusselt Number. But this is not satisfactory at angle 60°. At angle 60° Nusselt Number is comparatively lower. Because at rib angle 60° the formation of vortex is distributed near all row of rib. Compared with continuous baffle, the low heat transfer behind the rib is enhanced by the designed mist cooled ribbed channel with a slightly reduction of pressure drops. Variation of heat transfer as well as friction factors are respectively 5.6% and 5.4 % compared with continuous baffle. As Rib with baffle can enhance the overall hear transfer performance and create more uniform heat transfer fields, it is used in internal cooling of gas turbine blades.
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Copyright (c) 2025 Sadhan Mondal, Khandkar Aftab Hossain (Author)
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