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首页> 外文期刊>Computational thermal sciences >STUDY OF EFFECT OF MOLECULAR PRANDTL NUMBER, TRANSPIRATION AND LONGITUDINAL PRESSURE GRADIENT ON FLOW AND HEAT TRANSFER CHARACTERISTICS IN BOUNDARY LAYERS
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STUDY OF EFFECT OF MOLECULAR PRANDTL NUMBER, TRANSPIRATION AND LONGITUDINAL PRESSURE GRADIENT ON FLOW AND HEAT TRANSFER CHARACTERISTICS IN BOUNDARY LAYERS

机译：分子prandtl数，蒸腾和纵向压力梯度对边界层流动和传热特性的影响研究

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摘要

A numerical modeling of a subsonic flow at a permeable plate in the presence of a flow pressure gradient is carried out using a differential turbulence model, supplemented with the transport equation for the turbulent heat flux. The dependences of the turbulent Prandtl number and other turbulent flow and heat transfer characteristics from the molecular Prandtl number, injection (suction) intensity of the gas through the permeable wall, and the acceleration parameter of the flow are presented. Air and mixtures of helium with xenon and argon are selected as the gas heat carriers and mercury, water, and transformer oil are selected as the liquid heat carriers, respectively. The effect of the variability of the turbulent Prandtl number on heat transfer characteristics, in particular, on the Nusselt number, is studied. It is shown that the difference of the Nusselt number obtained in the condition of the constant turbulent Prandtl number from the results obtained in the calculations with the equation for the turbulent heat flux increases under low and high molecular Prandtl number. The injection, suction, and pressure gradient also increase this difference and also lead to a substantial violation of the Reynolds analogy.
机译：使用差动湍流模型进行流动压力梯度存在下可渗透板处的亚态流量的数值建模，其补充有用于湍流热通量的传输方程。辐射湍流数量和其他湍流和传热特性的湍流与气体的分子PRANDTL数，喷射（抽吸）强度通过可渗透壁的依赖性，以及流动的加速度参数。选择氦气和氩气的空气和混合物作为气体热载体和汞，水和变压器油分别作为液体热载体选择。研究了湍流普朗特数对传热特性的可变性的影响，特别是在营养数上。结果表明，在从计算中获得的结果中获得的恒定湍流普朗特数的条件下获得的营养数量的差异在低和高分子prandtl数下增加。注射，抽吸和压力梯度也增加这种差异，并且还导致雷诺比的重大侵犯。

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