Abstract

The present investigation addresses the impacts of nanoadditive (NA) type on the irreversibility aspects of γ-AlOOH nanofluid (NF) flow in a sinusoidal channel. To this aim, the two-phase mixture technique is employed to solve the governing formulas. The considered NA types are platelet, cylindrical, blade, brick, and spherical. The effect of Reynolds number and NA volume fraction on the local and global irreversibilities due to friction and heat transfer are numerically examined for various NA types. The results showed that the application of the platelet and spherical NA types respectively leads to the highest and lowest increment in the viscosity of the NF. Besides, it was found the highest and lowest thermal conductivity respectively belongs to the NFs composed of cylindrical and platelet NA types. In addition, it was depicted that the NF with platelet type NA presents the maximum frictional, thermal, and total irreversibilities, while the minimum values belongs to the NF with spherical NA type. Moreover, the findings revealed that boosting the $\phi$ and $Re$ causes an increment in the frictional and thermal irreversibilities. Furthermore, it was reported that the thermal irreversibility has a more contribution in the total irreversibility compared to the frictional irreversibility.

摘要

本研究探讨了纳米添加剂 (NA) 类型对正弦通道中 γ-AlOOH 纳米流体 (NF) 流动的不可逆性方面的影响。为此，采用两相混合技术求解控制公式。考虑的 NA 类型是片状、圆柱状、叶片状、砖状和球状。对于各种 NA 类型，雷诺数和 NA 体积分数对摩擦和热传递引起的局部和全局不可逆性的影响进行了数值研究。结果表明，片状和球形 NA 类型的应用分别导致 NF 粘度的最高和最低增量。此外，发现导热系数最高和最低的分别属于由圆柱形和片状 NA 类型组成的 NF。此外，据描述，具有片状 NA 的 NF 呈现出最大的摩擦、热和总不可逆性，而最小值属于具有球形 NA 类型的 NF。此外，调查结果显示，促进$\phi$和$R\mathrm{电子}$导致摩擦和热不可逆性的增加。此外，据报道，与摩擦不可逆性相比，热不可逆性对总不可逆性的贡献更大。