Exploring the Influence of Vibration on Natural Convection in Hybrid Nanofluids via the IB-STLBM

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL

Iranian Journal of Science and Technology-Transactions of Mechanical Engineering Pub Date : 2024-09-15 DOI:10.1007/s40997-024-00805-7

Yuan Ma, M. M. Rashidi, Rasul Mohebbi, Zhigang Yang

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Abstract

In recent years, numerous studies have consistently demonstrated the remarkable impact of nanofluids on augmenting heat transfer processes. In the present study, the numerical investigation focuses on the analysis of MWCNT-Fe₃O₄/water hybrid nanofluid natural convection within a vibrating cavity. The governing equations are solved by the IB-STLBM, which combines the immersed boundary method with the simplified and highly stable lattice Boltzmann method. The results indicate a positive correlation between the Nusselt number and both Ra and ϕ, indicating an increase in heat transfer performance with higher Ra and ϕ values. The study further reveals that variations in a and ω have minimal impact on the overall averaged heat transfer characteristics (Nu_mean), yet do influence the instantaneous heat transfer characteristics in terms of frequency and amplitude (Nu_avg). Specifically, when Ra = 10⁵, Ar = 2.5 and ϕ = 0.003, adjusting a and ω can result in a maximum increase of 2.4% in the Nu_mean. Moreover, while changes in Ar do not affect the amplitude and frequency of Nu_avg fluctuations due to the unchanged motion modes of the system, they do impact Nu_mean.

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通过 IB-STLBM 探索振动对混合纳米流体中自然对流的影响

近年来，大量研究不断证明纳米流体对增强传热过程的显著影响。在本研究中，数值研究的重点是分析 MWCNT-Fe3O4/ 水混合纳米流体在振动腔内的自然对流。治理方程采用 IB-STLBM 法求解，该方法结合了沉浸边界法和简化且高度稳定的晶格玻尔兹曼法。结果表明，努塞尔特数与 Ra 和 ϕ 之间呈正相关，表明随着 Ra 和 ϕ 值的增大，传热性能也会提高。研究进一步表明，a 和 ω 的变化对整体平均传热特性（Numean）的影响极小，但对频率和振幅（Nuavg）的瞬时传热特性有影响。具体来说，当 Ra = 105、Ar = 2.5 和 ϕ = 0.003 时，调整 a 和 ω 可使 Numean 最大增加 2.4%。此外，由于系统的运动模式不变，Ar 的变化不会影响 Nuavg 波动的振幅和频率，但会影响 Numean。

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来源期刊

Iranian Journal of Science and Technology-Transactions of Mechanical Engineering ENGINEERING, MECHANICAL-

CiteScore

2.90

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： Transactions of Mechanical Engineering is to foster the growth of scientific research in all branches of mechanical engineering and its related grounds and to provide a medium by means of which the fruits of these researches may be brought to the attentionof the world’s scientific communities. The journal has the focus on the frontier topics in the theoretical, mathematical, numerical, experimental and scientific developments in mechanical engineering as well as applications of established techniques to new domains in various mechanical engineering disciplines such as: Solid Mechanics, Kinematics, Dynamics Vibration and Control, Fluids Mechanics, Thermodynamics and Heat Transfer, Energy and Environment, Computational Mechanics, Bio Micro and Nano Mechanics and Design and Materials Engineering & Manufacturing. The editors will welcome papers from all professors and researchers from universities, research centers, organizations, companies and industries from all over the world in the hope that this will advance the scientific standards of the journal and provide a channel of communication between Iranian Scholars and their colleague in other parts of the world.