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首页> 外文期刊>Journal of Thermophysics and Heat Transfer >Stagnation Heat Transfer on a Concave Surface Cooled by Unconfined Slot Jet
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Stagnation Heat Transfer on a Concave Surface Cooled by Unconfined Slot Jet

机译：通过无限制槽口喷嘴冷却的凹面上的停滞传热

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摘要

Heat transfer at the stagnation point on a concave surface and on a flat plate subjected to unconfined slot jet impingement is characterized and compared at a fixed jet Reynolds number of Re-B = 20,000. The concave surface diameter-to-slot width ratio is fixed at 9.0, whereas the slot exit-to-target surface distance, H/B, varies from 0.5 to 20.0. In particular, the nonmonotonic variation of heat transfer at the stagnation point with H/B is fluidically explained. The present results clarify that the deflection zone formed on the target surface as a result of the jet impingement leads to the upstream shift of the peak in turbulence strength that exactly coincides with the peak of heat transfer at the stagnation point. With the concave surface, the impinging jet deflected radially on the surface is re-entrained into the incoming jet due to the curvature, which causes the shortening of the potential core of the slot jet and the longitudinal upstream shift of the peak in turbulence strength compared with the flat plate. Therefore, the peak in heat transfer at the stagnation point occurs at shorter H/B on the concave surface than on the flat plate.
机译：在凹面和平板上的停滞点处的热传递受到无限制的狭缝射流冲击的特征是，在固定的雷诺数Re-B = 20,000时进行了传热比较。凹面直径与缝隙宽度之比固定为9.0，而缝隙出口至目标表面的距离H / B在0.5到20.0之间变化。尤其是，用流体力学解释了在停滞点传热的非单调变化。本结果表明，由于射流撞击而在目标表面上形成的偏转区域导致湍流强度峰值的上游偏移，该峰值与在停滞点的传热峰值恰好重合。在凹面的情况下，在径向上偏转的冲击射流由于曲率而被重新夹带到进入射流中，这导致狭缝射流的潜在核心缩短，并且湍流强度峰的纵向上游偏移与平板。因此，在凹点处的H / B比平板上的H / B短时，在滞止点的传热的峰值出现。

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  • 来源
    《Journal of Thermophysics and Heat Transfer》 |2016年第3期|558-566|共9页
  • 作者

    Nguepnang Maurel A.; Boer Michael; Kim Tongbeum;

  • 作者单位

    Univ Witwatersrand, Sch Mech & Aeronaut Engn, ZA-2000 Johannesburg, South Africa;

    Univ Witwatersrand, Sch Mech & Aeronaut Engn, ZA-2000 Johannesburg, South Africa;

    Univ Witwatersrand, Sch Mech & Aeronaut Engn, Cooling Technol, ZA-2000 Johannesburg, South Africa;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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