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首页> 外文期刊>International Journal of Heat and Mass Transfer >Onset of convection in a non-Newtonian viscous flow through a horizontal porous channel
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Onset of convection in a non-Newtonian viscous flow through a horizontal porous channel

机译：通过水平多孔通道的非牛顿粘性流中对流的开始

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An impermeable horizontal fluid saturated porous layer is studied with respect to the onset of thermal convection. The saturating fluid is a Ostwald-de Waele type of non-Newtonian fluid. The viscous dissipation is the only heat source present inside the layer. A basic throughflow whose direction is arbitrary in the horizontal plane occurs. The basic flow produces, by means of viscous dissipation, a basic non-uniform vertical temperature gradient. The linear stability analysis of the basic state is carried out. The critical values are obtained as functions of the magnitude and of the inclination of the basic throughflow and as functions of the power-law index. The identification of the most unstable mode is performed: while for pseudoplastic fluids the most unstable modes are transverse rolls, for dilatant fluids the most unstable modes can be either loneitudinal or transverse rolls.
机译：关于热对流的开始，研究了不可渗透的水平流体饱和多孔层。饱和流体是非牛顿流体的Ostwald-de Waele类型。粘性耗散是层内部唯一的热源。发生在水平面上方向任意的基本通流。基本流通过粘性耗散产生基本的非均匀垂直温度梯度。进行基本状态的线性稳定性分析。根据基本通量的大小和斜率以及幂律指数获得临界值。进行最不稳定模式的识别：对于假塑性流体，最不稳定模式是横向辊，对于膨胀流体，最不稳定模式可以是纵向辊或横向辊。

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