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Onset of buoyancy-driven motion with laminar forced convection flows in a horizontal porous channel

机译:层流强迫对流在水平多孔通道中浮力驱动运动的开始

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Buoyancy-driven motion in the laminar forced convection flow has been investigated in a horizontal porous channel. The stability equations including the inertia and the dispersion effects have been solved analytically under the linear theory and also the principle of exchanges of stabilities. The resulting critical position x_c for the onset of convection becomes larger with increasing the Reynolds number, Re_k considering the permeability. This means that the more inertia and dispersion make the system more stable. The ionic mass transfer experiments using the limiting current technique have been conducted to obtain the critical position for the manifest convection, i.e. the undershoot distance x_u with comparison of the forced convective mass flux with the mixed-convective one. Based on the experimental results, the inertia and dispersion effects are explained reasonably for the stabilization of the present system.
机译:在水平多孔通道中研究了层流强迫对流中的浮力驱动运动。包括惯性和色散效应在内的稳定性方程已在线性理论以及稳定性交换原理的基础上进行了解析求解。考虑到渗透率,随着雷诺数的增加,对流开始的最终临界位置x_c变大。这意味着更大的惯性和分散度使系统更加稳定。已经进行了使用极限电流技术的离子传质实验,以得到明显对流的临界位置,即下冲距离x_u,并将强制对流质量通量与混合对流质量通量进行了比较。基于实验结果,合理地解释了惯性和色散效应,以稳定本系统。

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