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首页> 外文期刊>Journal of thermal analysis and calorimetry >A numerical investigation on the influence of nanoadditive shape on the natural convection and entropy generation inside a rectangle-shaped finned concentric annulus filled with boehmite alumina nanofluid using two-phase mixture model
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A numerical investigation on the influence of nanoadditive shape on the natural convection and entropy generation inside a rectangle-shaped finned concentric annulus filled with boehmite alumina nanofluid using two-phase mixture model

机译：用两相混合模型，用双相混合模型填充勃姆石氧化铝纳米流体中矩形翅片同心环内自然对流和熵生成影响的数值研究

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摘要

The goal of this work is to numerically study the hydrothermal and entropy generation specifications of boehmite alumina (gamma-AlOOH) nanofluid flowing in a finned concentric annulus using the two-phase mixture model. Different shapes for the nanoadditives are examined including cylindrical, brick, blade, platelet and spherical. The impacts of nanoadditive shape and volume concentration (phi), Rayleigh number (Ra) and application of fins on the streamlines, isotherms, Nusselt number as well as both the local and global rates of entropy generation due to the heat transfer and fluid friction are examined. The results indicated that the addition of fins and employing a higher Ra cause a higher average Nusselt number and generation rate of thermal entropy. Moreover, it was found that, except for Ra=103, the generation rate of frictional entropy intensifies by utilizing fins. Moreover, the frictional entropy generation rate was enhanced using a higher Ra and phi. The results depicted that the impact of fins on the Nusselt number and entropy generation is not varied by the nanoadditive shape and concentration. Furthermore, it was concluded that the best nanoadditive shape is cylindrical and platelet, respectively, based on the first and the second laws of thermodynamics.
机译：本作作品的目标是使用双相混合物模型在数值上研究勃姆石氧化铝（Gamma-AlOOH）纳米流体中纳米流体流动的水热和熵生成规范。检查纳米造碳的不同形状，包括圆柱形，砖，叶片，血小板和球形。纳米彩色形状和体积浓度（PHI），瑞利数（RA）和翅片在流线上的施加和施加在流动线上的影响以及由于传热和流体摩擦引起的熵产生的局部和全球速率检查。结果表明，添加鳍片并采用较高的RA的添加导致较高的营养熵数和产生率。此外，发现除了RA = 103之外，通过利用鳍片，摩擦熵的产生率加剧。此外，使用较高的RA和PHI增强了摩擦熵生成率。结果描绘了鳍片对露珠数和熵生成的影响不是由纳米造成形状和浓度变化的。此外，得出结论，基于第一和第二热力学定律，分别是最佳纳米彩色形状是圆柱形和血小板。

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