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首页> 外文期刊>American journal of engineering and applied sciences >Numerical Study of Natural Convection in a Square Porous Cavity Thermally Modulated on Both Side Walls
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Numerical Study of Natural Convection in a Square Porous Cavity Thermally Modulated on Both Side Walls

机译：两侧壁均热调制的方孔中自然对流的数值研究

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摘要

The numerical study of natural convection in a square porous cavity saturated by a Newtonian fluid is presented in this study. The vertical walls are subjected to temperatures varying sinusoidally in time and phase opposition while the upper and lower horizontal walls are thermally adiabatic. Darcy model is used, it is also assumed the fluid studied is incompressible and obeys the Boussinesq approximation. The focus is on the effect of the modulation frequency (10 ≤ ω ≤ 100) and the Rayleigh number (10 ≤ Ra ≤ 1000) on the structure of the flow and transfer thermal. The results show that the extremal stream functions (ψ_(max) and ψ_(min)), the average Nusselt number at the hot (T_c) and cold (T_f) walls respectively Nucmoy and Nufmoy are periodic and periods equal to that excitatory temperatures to the range of parameters considered in this study. The results show also that oscillatory heating causes the appearance of secondary flow, whose amplification depends on the frequency of modulation of the imposed temperature. The results are shown in terms of streamlines and isotherms during a flow cycle.
机译：这项研究提出了牛顿流体饱和的方孔中自然对流的数值研究。垂直壁在时间和相位上呈正弦变化，而上下水平壁则是绝热的。使用Darcy模型，还假定研究的流体是不可压缩的，并且服从Boussinesq近似。重点是调制频率（10≤ω≤100）和瑞利数（10≤Ra≤1000）对流动和传递热的结构的影响。结果表明，极值流函数（ψ_（max）和ψ_（min）），热壁（T_c）和冷壁（T_f）的平均努塞尔数分别是周期性的，并且周期等于该兴奋温度至本研究中考虑的参数范围。结果还表明，振荡加热会引起二次流的出现，二次流的放大取决于施加温度的调制频率。结果以流动周期中的流线和等温线表示。

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