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基于修正的Darcy定律,数值模拟了上端开口,从底部等温加热的多孔介质中黏弹性流体的自然对流与传热,其中使用了特征松弛时间λ和迟滞时间ε来表征黏弹性流体的性质。我们选择了三组不同的λ和ε.发现与牛顿流体中对应的情况相比,黏弹性流体的传热特性有很大不同。另外,上端开口多孔介质中的黏弹性流体比上端闭口多孔介质中黏弹性流体的自然对流与传热也有很大不同.在不同的Ra数范围,传热规律服从不同的标度律。
Based on the modified Darcy’s law, the numerical simulation of the natural convection and heat transfer of viscoelastic fluid in porous media with an open upper end and isothermally heated from the bottom is carried out. The characteristic relaxation time λ and the lag time ε are used to characterize the viscoelastic fluid. We chose three different sets of λ and ε and found that the viscoelastic fluid has very different heat transfer characteristics compared to the corresponding Newtonian fluid. In addition, the viscoelastic fluid in the open porous media is also very different from the natural convection and heat transfer of the viscoelastic fluids in the closed porous media at the upper end, and the heat transfer laws follow different scales in different Ra numbers.