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首页> 外文期刊>Journal of Heat Transfer >Local Thermal Nonequilibrium Analysis of Boundary Layer Flow of Carreau Fluid Over a Wedge in a Porous Medium
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Local Thermal Nonequilibrium Analysis of Boundary Layer Flow of Carreau Fluid Over a Wedge in a Porous Medium

机译：多孔介质楔形窝流体边界层流动的局部热非预测分析

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摘要

This work examines the steady two-dimensional mixed convection boundary layer flow of non-Newtonian Carreau fluid embedded in a porous medium. The impermeable wedge is at rest over which the momentum and thermal boundary layers form due to the motion of Carreau fluid with a large Reynolds number. We consider local thermal nonequilibrium for which the temperature of the solid porous medium is different from that of the fluid phase, and hence, a single heat-transport equation is replaced by a two-temperature model. The governed equations for flow and heat transfer are converted into a system of ordinary differential equations using a similarity approach. It is observed that local thermal nonequilibrium effects are dominant for small interphase heat transfer rate and porosity scaled conductivity parameters. It is shown that the temperature at any location of the solid porous medium is always higher than that of the fluid phase. When these parameters are increased gradually, the local thermal equilibrium phase is recovered at which the temperatures of the fluid and solid are identical at each pore. A similar trend is noticed for both shear-thinning and shear-thickening fluids. The results further show that heat exchange between the fluid and solid porous medium is similar to both assisted and opposed flows and Carreau fluid. The velocity and temperature fields for the various increasing fluid index, Grashof number, and permeability show that the thickness of the momentum and thermal boundary layer is thinner.
机译：这项工作介绍了嵌入多孔介质中的非牛顿卡特雷液的稳定二维混合对流边界层流。不可渗透的楔形静止在其余部分，由于卡乐液与大型雷诺数的运动，所以动量和热边界层形成。我们认为固体多孔介质的温度与流体相的温度不同的局部热非预测，因此，通过两个温度模型代替单个传热方程。使用相似性方法将用于流动和传热的控制方程转换为常微分方程的系统。观察到局部热非预测效应是小相传热速率和孔隙度缩放电导率参数的显性。结果表明，固体多孔介质的任何位置处的温度总是高于流体相的温度。当这些参数逐渐增加时，回收局部热平衡阶段，在该孔中的液体和固体的温度在每个孔上相同。对剪切稀疏和剪切增稠液体表示类似的趋势。结果进一步表明，流体和固体多孔介质之间的热交换类似于辅助和相对的流动和奥克伦流体。各种增加流体指数，格雷什数和渗透性的速度和温度场表明，动量和热边界层的厚度较薄。

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  • 来源
    《Journal of Heat Transfer》 |2021年第7期|071801.1-071801.9|共9页
  • 作者

    Ramesh B. Kudenatti; Sandhya L.;

  • 作者单位

    Department of Mathematics Bengaluru City University Central College Campus Bengaluru 560 001 India;

    Department of Mathematics Bangalore University Bengaluru 560 056 India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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