<p>Rotating heat transfer is a predominant phenomenon in many applications like gas turbine rotor, automotive brake disks, etc. In the current study, an experimental investigation of the heat transfer of an impinging air jet on a rotating pin-fin heat sink has been carried out. The effect of the jet impinging eccentrically on the rotating surface has been studied. As the impingement location moves away from the axis of rotation, the flow becomes increasingly rotation dominant. Three different impingement locations – at a distance (r) from the axis of rotation equal to 0%, 33% and 67% of the rotating disk radius (R) were used. &nbsp;Steady state measurements have been carried out using thermocouples embedded at different locations in a rotating aluminum disk which has an array of square pin-fins. The performance of the surface with pin finsthis configuration has been compared based on the area averaged Nusselt number with a smooth rotating disk of equal diameter. Experiments have been conducted at rotational Reynolds numbers (Re<sub>r</sub>) of 3000 - 9000 based on the disk diameter (D) and jet Reynolds numbers (Re) of 5000 - 10000 based on the jet hydraulic diameter. Three different impingement locations – at a distance (r) from the axis of rotation equal to 0%, 33% and 67% of the rotating disk radius (R) were used. The diameter of the impinging jet (d) has been kept constant in order to maintain an equal jet footprint across all the cases. The performance of the surface with pin fins has been compared with a smooth rotating disk of equal diameter. Area averaged Nusselt number is calculated for both the cases. Preliminary results indicate that with an increase in both eccentricity (r/R) and rotational Reynolds number, heat transfer enhancement increases.</p>

Effect of Eccentric Jet Impingement on a Rotating Pin-Fin Heat Sink

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

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