HEAT TRANSFER ENHANCEMENT ON A FLAT PLATE USING ORIENTED SEMI-CIRCULAR GROOVES: NUMERICAL AND EXPERIMENTAL STUDY
DOI:
https://doi.org/10.65204/djes.v3i3.869Abstract
Three panels were fabricated from duralumin with dimensions of (400 × 300 mm). The first was a reference (flat plate), the second had transverse grooves perpendicular to the flow direction, and the third had longitudinal grooves parallel to the flow direction. The experiments were conducted in an open wind tunnel with a fixed flow velocity of 8 m/s. The ANSYS Fluent 2020 environment was used for numerical simulations, and the k-ω SST turbulence model was used to analyze the flow physics within the grooved regions.
The results indicate that both grooved designs significantly improve the heat transfer coefficient (h) compared to a smooth surface. The transverse design demonstrated superior thermal performance, attributed to the periodic separation and reattachment of the flow, which hinders the formation of the thermal boundary layer. In contrast, the longitudinal grooves enhanced secondary flow vortices that improved mixing while reducing pressure drop. Validation of the numerical model using experimental data showed excellent agreement, with a maximum deviation of less than 8–12%.
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