Abstract
The present study investigated the impact of various parameters on pressure drop, Nusselt number, and friction factor in grooved annular channels, which have practical applications in cooling electric motors and generators. The parameters studied include the effective Reynolds number, Taylor number, groove aspect ratio, number of grooves, and groove angle. The k-ω SST turbulence model was employed in CFD simulations for various parameter ranges. These ranges include an effective Reynolds number spanning from 4.42 × 103to 1.6 × 104, Taylor number of 0–2.24 ×106, the groove aspect ratio of 0 to 2, the number of grooves ranging from 5 to 20, and the groove angle ranging from 70° to 130°. As the effective Reynolds and Taylor numbers increase within the ranges noted above, the Nusselt number exhibits a corresponding increase of 9.16 % and 1.77 %, respectively. However, the effective Reynolds number plays a more significant role. Various design factors, including the number of grooves, the aspect ratio, and the groove angle, also influenced the heat transfer enhancement. As any of these factors increase within the specified ranges, the corresponding Nusselt number values increase by 2.35 %, 3.62 %, and 6.09 %, respectively.
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