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Most of the flow ejected from inclined nozzles flows downhill, with less flow travelling in the opposite (uphill) direction. The flow in the uphill direction will become stationary at some radial distance, depending on the jet Reynold’s number and the angle of inclination. Designing a rib that maximizes heat transfer rate in the uphill direction was the aim of this research paper. The rib design was based on the idea of enhancing heat transfer in the uphill direction especially for the lower inclined angle (α=45°). The roughened element took the shape dropped tear with square cross-section. The roughness elements were numerically investigated for two angles of jet inclination (α=45° and 60°) and six different heights (e/D), where D is the hydraulic diameter of the circular jet. The intended nonuniform dropped tear rib shape adapted a design idea of reducing the rib edges in the uphill direction where less flow takes place comparing to the downhill directions. The use of the famous uniform circular rib was for the sake of comparison with the especially designed dropped tear rib based on their effect on the average Nusselt number. The average Nu were calculated and compared for three cases in this research paper, the no-rib case (the baseline case), the circular rib case (uniform shape) and the dropped tear case (the nonuniform shape) in order to measure the effect of the special design rib on the heta transfer rate. The jet diameter kept constant for all simulations (D=13.5mm) where the plane was located at H/D = 6 below the jet, for all the tests with a jet Reynolds number of 20,000. Results are presented in the form of average Nusselt number within and beyond the stagnation region.

Heat Transfer Characteristics for Inclined Jet on a Roughened Flat Plate