非牛顿流体通过多孔壁面通道瞬态流动的计算不可逆性分析

T. Chinyoka, O. Makinde
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引用次数: 1

摘要

第二定律分析探讨了不可逆性在瞬态,多孔通道流动的粘性,不可压缩,和非牛顿流体。非牛顿流体模型是一种广义牛顿流体类型,没有弹性性质,但具有剪切变稀的黏度。此外,由于流动是非等温的,因此预期粘度也假定与温度有关。多孔通道通过壁面受到流体的不断吸入和注入。基于鲁棒有限差分数值技术的底层流体动力学方程的计算解在时间和空间上得到了发展和实现。我们演示了嵌入流体流动和传热参数对流体速度和温度分布的影响。我们还探讨了传热不可逆性与流体摩擦不可逆性的竞争效应。主要观察结果是,在获得最大速度的流动区域,传热不可逆性显著地支配着其他不重要的流体摩擦不可逆性。还可以观察到,在远离最大速度区域的流动区域中,情况正好相反,因此流体摩擦不可逆性明显优于传热不可逆性。沿通道壁面,流体摩擦不可逆性明显优于传热不可逆性。不排除某些参数选择可能导致相反情况的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Computational Irreversibility Analysis in Transient Flow of a Non-Newtonian Fluid through a Channel with Porous Walls
A second law analysis is explored to investigate the irreversibility properties in a transient, porous channel flow of a viscous, incompressible, and non-Newtonian fluid. The non-Newtonian fluid model is of a Generalized Newtonian Fluid type with no elastic properties but with shear-thinning viscosity. Additionally, given that the flow is non-isothermal, the viscosity is therefore expectedly also assumed to be temperature dependent. The porous channel is subjected to constant suction and injection of fluid through the walls. Computational solutions for the underlying fluid dynamical equations, based on robust finite difference numerical techniques, are developed and implemented in time and space. We demonstrate the effects of the embedded fluid flow and heat transfer parameters on the fluid velocity and temperature profiles. We also explore the competing effects of heat transfer irreversibility versus fluid friction irreversibility. The major observations are that, in the flow regions where the maximum velocity obtains, heat transfer irreversibility significantly dominates over the otherwise insignificant fluid friction irreversibility. It is also observed that, in those flow regions away from the region of maximum velocity, the opposite scenario obtains, and hence fluid friction irreversibility significantly dominates over heat transfer irreversibility. Along the channel walls, fluid friction irreversibility notably dominates over heat transfer irreversibility. The possibility that certain parameter choices may lead to reverse scenario is not discounted.
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