Abstract
This paper presents an investigation on the cooling performance in a ribbed channel with the pulsating inlet flow. The flow structures and heat transfer characteristics are simulated by solving the three-dimensional Unsteady Reynolds-Averaged Navier-Stokes equations (U-RANS) and the Shear Stress Transport (SST) turbulence model coupled with the γ-Reθ transition. The influence of pulsating parameters in terms of pulsating amplitudes and frequencies on the cooling performance are evaluated at the Reynold number of 10000. The results obtained show that the coolant velocity variation corresponds to the inlet velocity variation, almost the sinusoidal curve shape. The heat transfer performance influenced by the turbulence intensity is also the sinusoidal curve shape and increases with increasing pulsating amplitudes and frequencies. The pressure loss penalty related to the flow characteristics is also the sinusoidal curve shape while the thermal performance indexes at four time frames (1T/4, 2T/4, 3T/4 and 4T/4) show the 90-degree phase difference with the sinusoidal curve. Additionally, the thermal performance increases with increasing pulsating amplitudes and frequencies.
Published Version
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