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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Effects of magnetic field and viscous dissipation on entropy generation of mixed convection in porous lid-driven cavity with corner heater
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Effects of magnetic field and viscous dissipation on entropy generation of mixed convection in porous lid-driven cavity with corner heater

机译：磁场和粘性耗散对带角加热器的多孔盖驱动腔内混合对流熵产生的影响

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摘要

Purpose - The purpose of this paper is to investigate the effects of magnetic field and viscous dissipation on mixed convection heat transfer, fluid flow and entropy generation in a porous media filled square enclosure heated with corner isothermal heater. Design/methodology/approach - Finite volume method has been used to solve governing equations. A code is developed by FORTRAN and entropy generation is calculated from the obtained results of velocities and temperature. Results are presented via streamlines, isotherms, local and mean Nusselt number for different values of Richardson number (0.001 = Ri = 100), Hartmann number (0.001 = Ha = 100), Darcy number (0.001 = Da = 0.1), length of heaters (0.25 = hx = hy = 0.75) and viscous dissipation factors (10-4 = ε = 10-6). Findings - It is observed that entropy is generated mostly due to lid-driven wall and right side of the heater. Entropy generation decreases with increasing of Hartmann number and heat transfer increases with decreasing of viscous parameter. Originality/value - The originality of this work is to application of magnetic field and viscous dissipation on entropy generation in a lid-driven cavity with corner heater. Here, both corner heater and the external forces are original parameters.
机译：目的-本文的目的是研究用角等温加热器加热的多孔介质填充方形外壳中磁场和粘性耗散对混合对流传热，流体流动和熵产生的影响。设计/方法/方法-有限体积法已用于求解控制方程。 FORTRAN开发了一个代码，并根据所获得的速度和温度结果来计算熵的产生。结果通过流线，等温线，局部和平均Nusselt数（针对Richardson数（0.001 = Ri = 100），Hartmann数（0.001 = Ha = 100），Darcy数（0.001 = Da = 0.1），加热器长度表示（0.25 = hx = hy = 0.75）和粘性耗散系数（10-4 =ε= 10-6）。结果-观察到熵的产生主要是由盖子驱动的壁和加热器的右侧引起的。熵的产生随着哈特曼数的增加而减少，而热传递随着粘性参数的减少而增加。创意/价值-这项工作的创意在于将磁场和粘性耗散应用于带有角加热器的盖子驱动型腔中的熵产生。在此，拐角加热器和外力都是原始参数。

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