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首页> 外文会议>International Conference on Fluid Mechanics; 20040720-30; Dalian(CN) >NUMERICAL SIMULATIONS OF TURBULENT MIST FLOW AND CONJUGATE HEAT TRANSFER IN A COOLING DEVICE OF MOVING HOT STEEL ROD
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NUMERICAL SIMULATIONS OF TURBULENT MIST FLOW AND CONJUGATE HEAT TRANSFER IN A COOLING DEVICE OF MOVING HOT STEEL ROD

机译：移动钢棒冷却装置中湍流雾流和共轭传热的数值模拟

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摘要

The 2D axisymmetric turbulent mist flow and conjugate heat transfer in a concentric tube with a peripherally-mounted jet nozzle and a moving hot inner rod are investigated numerically. The k-e two-equation model with low-Reynolds-number modification was adopted for closure. Turbulent thermal field was modeled by Reynolds analogy of heat transfer to momentum transfer. The parametric studies show that the characteristics of turbulent mist flows and conjugate heat transfer are very sensitive to the variation of flow rate, rod speed and water-vapor concentration. The largest temperature gradient occurs in the position where the stronger clockwise-separating bubble is close to and cooling jet could impinge with the rod surface. It is found that with an increase in rod speed or water vapor concentration, temperature profiles along radial direction at outlet of both rod and fluid are increased, while an increase of the mixed fluid flux results in decrease of the temperature profiles.
机译：数值研究了同心管中二维二维轴对称湍流的薄雾流动和共轭传热，该同心管带有外围安装的喷嘴和移动的热内杆。采用低雷诺数修改的k-e二方程模型进行闭合。用雷诺将热传递与动量传递进行类比来模拟湍流热场。参数研究表明，湍流的薄雾流动和共轭传热特性对流量，杆速和水蒸气浓度的变化非常敏感。最大的温度梯度发生在顺时针方向分离的气泡更靠近且冷却射流可能撞击杆表面的位置。发现随着杆速度或水蒸气浓度的增加，在杆和流体的出口处沿径向的温度分布增加，而混合流体通量的增加导致温度分布的减小。

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