Numerical investigation of flow and heat transfer characteristics in jet eccentrically impinging on a rotating disk

Jet impingement cooling technology is mainly applied in advanced and efficient thermal management systems. This paper employs a CFD method, based on the Volume of Fluid method and SST k-ω turbulence model, to investigate the oil film flow and heat transfer characteristics on the surface of a rotating disk under the impact of an eccentric oil jet. This study investigates the effects of parameters including the rotational Reynolds number ( Re ω = 169,400–508,200), jet Reynolds number ( Re j = 3300–5500), nozzle eccentricity ratio ( ε = 0–0.6), and jet temperature ( T j = 333.15 K – 373.15 K) on heat transfer performance and oil film flow behavior. The results show that, under all operating conditions, the maximum local Nusselt number of the coupled wall occurs near the jet impingement core region. With an increase in the rotational Reynolds number, jet Reynolds number, and jet temperature, the Nusselt number on the coupled wall also rises. Furthermore, a moderate increase in the nozzle eccentricity ratio contributes to improving the convective heat transfer intensity on the coupled wall. The average Nusselt number of the coupled wall reaches its maximum value when the nozzle eccentricity ratio is 0.3 or 0.4. A dimensionless correlation between the average Nusselt number of the coupled wall and the rotational Reynolds number, jet Reynolds number, Prandtl number, and nozzle eccentricity ratio was developed, with the maximum relative prediction error not exceeding 6%.