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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Boundary integral study of nanoparticle flow behaviour in the proximity of a solid wall
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Boundary integral study of nanoparticle flow behaviour in the proximity of a solid wall

机译：固体壁附近纳米颗粒流动行为的边界积分研究

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摘要

Compared with traditional heat transfer fluids, the greater thermal conductivity and better convective heat transfer behaviour with little pressure penalty have made nanofluids one of the most promising emerging technologies in the field of heat transfer applications. There is however only limited knowledge of the mechanisms by which these improvements are obtained and how other factors (particle clustering, migration, interactions with the walls, etc) influence the behaviour of the nanofluids. In this study, a boundary integral formulation is used to simulate the flow of Al2O3/water with 1.05% volume concentration in the vicinity of a plane wall with special attention to particle behaviour and interactions. The simulation includes effects from Brownian motion, van der Waals attraction, electrostatic short range repulsion forces and buoyancy in order to assure physical representation. Viscous drag force and hydrodynamic interaction between the particles are calculated implicitly from the flow field improving the accuracy of the calculations. Results showed that a zone with similar to 17% higher concentration (similar to 0.6% additional increase in thermal conductivity) was created similar to 0.3 mu m away from the wall; this can help increase the heat conductivity and thus improve heat transfer. High cross flow velocities were also observed which can contribute to mixing in the boundary layer further improving the performance of the nanofluid.
机译：与传统的传热流体相比，更高的热导率和更好的对流传热特性，几乎没有压力损失，这使纳米流体成为传热应用领域最有前途的新兴技术之一。但是，对于获得这些改进的机理以及其他因素（颗粒团聚，迁移，与壁的相互作用等）如何影响纳米流体的行为，知之甚少。在这项研究中，使用边界积分公式来模拟体积比为1.05％的Al2O3 /水在平面壁附近的流动，并特别注意粒子的行为和相互作用。该模拟包括布朗运动，范德华吸引力，静电短程排斥力和浮力的影响，以确保物理表示。从流场中隐式地计算了颗粒之间的粘性阻力和流体动力相互作用，从而提高了计算的准确性。结果表明，在距墙约0.3微米处创建了一个浓度高出约17％（约​​0.6％的额外热导率增加）的区域。这可以帮助增加热导率，从而改善热传递。还观察到高的错流速度，其可以有助于边界层中的混合，从而进一步改善了纳米流体的性能。

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