Kulkarni Devdatta P, Das Debendra K, Chukwu Godwin A
Department of Mechanical Engineering, University of Alaska Fairbanks, AK 99775-5905, USA.
J Nanosci Nanotechnol. 2006 Apr;6(4):1150-4. doi: 10.1166/jnn.2006.187.
A nanofluid is the dispersion of metallic solid particles of nanometer size in a base fluid such as water or ethylene glycol. The presence of these nanoparticles affects the physical properties of a nanofluid via various factors including shear stress, particle loading, and temperature. In this paper the rheological behavior of copper oxide (CuO) nanoparticles of 29 nm average diameter dispersed in deionized (DI) water is investigated over a range of volumetric solids concentrations of 5 to 15% and various temperatures varying from 278-323 degrees K. These experiments showed that these nanofluids exhibited time-independent pseudoplastic and shear-thinning behavior. The suspension viscosities of nanofluids decrease exponentially with respect to the shear rate. Suspension viscosity follows the correlation in the form ln(mus) = A(1/T)-B, where constants A and B are the functions of volumetric concentrations. The calculated viscosities from the developed correlations and experimental values were found to be within +/- 10% of their values.
纳米流体是纳米尺寸的金属固体颗粒在诸如水或乙二醇等基础流体中的分散体。这些纳米颗粒的存在通过包括剪切应力、颗粒负载和温度等各种因素影响纳米流体的物理性质。在本文中，研究了平均直径为29纳米的氧化铜（CuO）纳米颗粒分散在去离子（DI）水中，在5%至15%的体积固体浓度范围以及278 - 323开尔文的不同温度下的流变行为。这些实验表明，这些纳米流体表现出与时间无关的假塑性和剪切变稀行为。纳米流体的悬浮粘度随剪切速率呈指数下降。悬浮粘度遵循ln(μs)=A(1/T)-B形式的相关性，其中常数A和B是体积浓度的函数。从所建立的相关性计算出的粘度与实验值在其值的±10%范围内。
