纳米流体的系统研究:纳米粒子电荷和温度对热物理性质的影响

IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY Journal of the Korean Physical Society Pub Date : 2024-11-12 DOI:10.1007/s40042-024-01225-1
Taeil Yi
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引用次数: 0

摘要

本研究采用分子动力学模拟的方法系统地研究了纳米颗粒(NP)电荷和温度对纳米流体热物理性质的影响。带电纳米粒子与溶剂粒子之间的相互作用对黏度和导热性都有显著影响。纳米颗粒以不同的电荷进行建模,并根据径向分布函数、粘度和导热系数分析了它们对流体行为的影响,并使用Green-Kubo公式进行了计算。结果表明,NP电荷的增加会导致聚集减少、分散增强和粘度降低,而导热系数则表现出复杂的行为,在中等温度下随NP电荷的增加而降低,而在超临界区域则随NP电荷的增加而增加。温度也起着关键作用,纳米流体表现出典型的剪切变薄行为和明显的热导率相依赖响应。这些结果为优化冷却系统和润滑剂等应用的纳米流体特性提供了有价值的见解,在这些应用中,高效的传热和低能量耗散至关重要。对电荷和温度效应的系统分析有助于更好地理解控制纳米流体行为的潜在机制。
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Systematic investigation of nanofluids: impact of nanoparticle charge and temperature on thermophysical properties

This study systematically investigates the effects of nanoparticle (NP) charge and temperature on the thermophysical properties of nanofluids using molecular dynamics simulations. The interaction between charged nanoparticles and solvent particles significantly influences both viscosity and thermal conductivity. The nanoparticles are modeled with varying charges, and their impact on fluid behavior is analyzed in terms of radial distribution functions, viscosity, and thermal conductivity, computed using the Green-Kubo formalism. The findings reveal that increased NP charge leads to reduced aggregation, enhancing dispersion and lowering viscosity, while thermal conductivity exhibits complex behavior, decreasing with NP charge at moderate temperatures but increasing in the supercritical region. Temperature also plays a critical role, with nanofluids demonstrating typical shear-thinning behavior and a distinct phase-dependent response in thermal conductivity. These results provide valuable insights into optimizing nanofluid properties for applications such as coolant systems and lubricants, where both efficient heat transfer and low energy dissipation are crucial. The systematic analysis of charge and temperature effects contributes to a better understanding of the underlying mechanisms governing nanofluid behavior.

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来源期刊
Journal of the Korean Physical Society
Journal of the Korean Physical Society PHYSICS, MULTIDISCIPLINARY-
CiteScore
1.20
自引率
16.70%
发文量
276
审稿时长
5.5 months
期刊介绍: The Journal of the Korean Physical Society (JKPS) covers all fields of physics spanning from statistical physics and condensed matter physics to particle physics. The manuscript to be published in JKPS is required to hold the originality, significance, and recent completeness. The journal is composed of Full paper, Letters, and Brief sections. In addition, featured articles with outstanding results are selected by the Editorial board and introduced in the online version. For emphasis on aspect of international journal, several world-distinguished researchers join the Editorial board. High quality of papers may be express-published when it is recommended or requested.
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