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Transitional ventilated filling box flow with a line heat source

机译:带管线热源的过渡通风灌装箱流量

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A ventilated filling box flow in the transitional regime has been investigated over a wide range of Reynolds number, Re, and Prandtl number, Pr, to examine their effects, using direct numerical simulation. It has been shown that the parameter Re~2/Pr is an important control parameter, representing a measure of the strength of the plume source. A mapping of parameter-dependent behaviours was obtained, and the instability mechanism has been qualitatively analysed. The balance of kinetic energy equation terms demonstrated that the contribution of the shear production towards the total production reduces and the buoyancy production dominance increases with increasing Pr. Turbulence intensity in the upper buoyant layer was found to become increasingly Pr dependent with reducing Re~2/Pr. It has also been observed that with increasing Re~2/Pr the Pr dependence of the location of the interface, that forms between lower ambient and upper buoyant fluids, is more predominantly determined by that of the ventilation rate, while with reducing Re~2/Pr the Pr dependence of the location of the interface becomes affected also by the Pr dependent variation in the plume volume flux.
机译:使用直接数值模拟,已经在广泛的雷诺数(Re)和普朗特数(Pr)范围内研究了过渡状态下的通风填充箱流量,以检查其影响。已经表明,参数Re〜2 / Pr是重要的控制参数,代表了羽流源强度的量度。获得了与参数有关的行为的映射,并对定性机制进行了定性分析。动能方程项的平衡表明,随着Pr的增加,剪切产量对总产量的贡献减小,浮力产量优势增加。发现上浮力层中的湍流强度变得越来越依赖于Pr,并降低Re〜2 / Pr。还已经观察到,随着Re〜2 / Pr的增加,在较低的环境流体和较高的浮力之间形成的界面位置的Pr依赖性主要取决于通风速率,而降低了Re〜2 / Pr界面位置的Pr依赖性也受到羽流通量的Pr依赖性变化的影响。

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