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首页> 外文期刊>International Journal of Heat and Mass Transfer >Measurements of velocity and temperature fields in natural convective flows
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Measurements of velocity and temperature fields in natural convective flows

机译：自然对流流程中速度和温度场的测量

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摘要

The velocity and temperature fields of natural convective flows in a water pool simulating a simple passive safety system are experimentally investigated using particle image velocimetry and laser-induced fluorescence. Typical natural convective flows, large-scale circulation (LSC), and a vertical thermal plume are indicated by the mean velocity fields. The initial developing height of the vortex flows in a confined space corresponds to that of the LSC center in a broad space. The mean temperature clearly represents the thermal stratification. The high-temperature zone well matches the high-velocity region below the LSC center, where no significant energy dissipation occurs. The local Grashof number and Richardson number are examined. The results indicate that shear and inertia play similar roles to that of buoyancy, except with regard to the mean flow near the heater in a confined space. The regions of significant energy transfer due to shear and heat are near the free surface and middle layer, respectively. To investigate the energy transfer between the mean flow and turbulence, the turbulent energy production is determined. The results show that energy dissipated from the thermal plume to the turbulence drives the LSC and vortex flows. (C) 2019 Elsevier Ltd. All rights reserved.
机译：使用颗粒图像测速和激光诱导的荧光来实验研究了模拟简单被动安全系统的水池中的自然对流流的速度和温度场。典型的自然对流流动，大规模循环（LSC）和垂直热羽是平均速度场。在密闭空间中涡流流的初始显影高度对应于LSC中心在宽空间中的初始高度。平均温度明显表示热分层。高温区良好地匹配LSC中心下方的高速区域，其中没有发生显着的能量耗散。审查了当地的格雷什编号和理查森号码。结果表明，剪切和惯性与浮力的角色发挥了类似的作用，除了在限制空间中的加热器附近的平均流动方面。由于剪切和热量引起的显着能量转移区域分别在自由表面和中间层附近。为了研究平均流动和湍流之间的能量转移，确定湍流能量产生。结果表明，从热羽流耗散到湍流的能量驱动LSC和涡流。 （c）2019 Elsevier Ltd.保留所有权利。

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