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首页> 外文会议>The Ninth Asian thermophysical properties conference (ATPC 2010). >NUMERICAL STUDY ON CONVECTIVE HEAT TRANSFER OF PULSED TURBULENT IMPINGING JET
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NUMERICAL STUDY ON CONVECTIVE HEAT TRANSFER OF PULSED TURBULENT IMPINGING JET

机译：脉冲湍流冲击射流对流换热的数值研究

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摘要

Pulsed impinging jets have received increasing interests for their potential in heat and mass transfer enhancement. To further understand the heat and mass transfer properties in pulsed impinging jets, a numerical investigation has been performed on a two dimensional pulsed turbulent impinging jet with sinusoidal and intermittent pulsations to examine the effect of temperature-dependent thermophysical properties along with pulsation of the jet on the local Nusselt number distribution on the target surface. The numerical results indicate no obvious heat transfer enhancement by single sinusoidal pulsation, while significant heat transfer enhancement due to intermittent pulsation of the jet flow can be found over a wide range of conditions. Examination of the flow and thermal fields shows that the instantaneous heat transfer rate on the target surface is highly dependent on the hydrodynamic and thermal boundary layer development with time.
机译：脉冲撞击射流因其在传热和传质增强方面的潜力而受到越来越多的关注。为了进一步了解脉冲撞击射流的传热和传质特性，已对具有正弦和间歇性脉动的二维脉冲湍流撞击射流进行了数值研究，以检验随温度变化的热物理性质以及射流脉动的影响。目标表面上的局部Nusselt数分布。数值结果表明，单正弦脉动并没有明显的传热增强，而喷射流的间歇性脉动引起的显着传热增强却可以在很宽的条件范围内找到。对流场和热场的检查表明，目标表面上的瞬时传热速率高度依赖于流体动力和热边界层随时间的发展。

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