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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical simulation of entropy generation due to unsteady natural convection in a semi-annular enclosure filled with nanofluid
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Numerical simulation of entropy generation due to unsteady natural convection in a semi-annular enclosure filled with nanofluid

机译：在充满纳米流体的半环形外壳中，由于非自然对流而产生的熵的数值模拟

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A numerical study has been carried out to investigate the natural convection and entropy generation for different nanofluids within an inclined half-annulus heated from above. The conservation equations in cylindrical coordinates are solved using an in-house FORTRAN code based on the finite volume method coupled with multigrid acceleration. Water-based nanofluid containing various types of nanoparticles (Au, Ag, Cu and CuO) are used to examine the fluid flow and potential heat transfer enhancement in the annulus. The effective thermal conductivity and viscosity of nanofluids are calculated using the Maxwell-Garnetts (MG) and Brinkman models, respectively. The results demonstrate clearly that the average entropy generation due to heat transfer (STG) is strengthened by increasing Phi and Ra. Furthermore, for small inclination angles gamma = 0 degrees and 45 (SVG) and (STG) values are reduced as RR is augmented, whereas, their values were observed to strengthen when RR increases for large tilt angles gamma = 90 degrees, 135 degrees and 180 degrees. So, several important issues are highlighted that deserve greater attention. (C) 2018 Elsevier Ltd. All rights reserved.
机译：已经进行了数值研究，以研究从上方加热的倾斜半环内不同纳米流体的自然对流和熵产生。圆柱坐标系中的守恒方程是基于有限体积法结合多网格加速度的内部FORTRAN代码求解的。包含各种类型的纳米粒子（Au，Ag，Cu和CuO）的水基纳米流体用于检查环空中的流体流动和潜在的传热增强。分别使用Maxwell-Garnetts（MG）和Brinkman模型计算纳米流体的有效导热率和粘度。结果清楚地表明，通过增加Phi和Ra可以增强由于传热（）产生的平均熵。此外，对于小倾角，伽马= 0度，随着RR的增加，45（）和（）值减小，而对于大倾角，伽马= 90度，当RR增加时，它们的值会增强，135度和180度。因此，突出了几个重要的问题，值得更多关注。 （C）2018 Elsevier Ltd.保留所有权利。

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