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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Effects of single and multi-walled carbon nano tubes on water and engine oil based rotating fluids with internal heating
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Effects of single and multi-walled carbon nano tubes on water and engine oil based rotating fluids with internal heating

机译：单壁碳纳米管对水和发动机油基旋转流体的影响

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摘要

Three dimensional (3D) flow of a rotating Water and Engine Oil Based fluid is analyzed. Effects of nanometer (nm) sized Single (SWCNT) and multiwalled carbon nanotubes (MWCNT) are examined on flow and heat transfer characteristics. Thermofluid performance within Water and Engine Oil base fluid are investigated using thermal conductivity and viscosity of both single and multiple wall carbon nanotubes (CNTs) of similar volume. The governing partial differential equations are converted into nonlinear, coupled, ordinary differential equations which are solved numerically using a combination of Quasi-linearization and Chebyshev pseudo-spectral methods. Effects of relevant parameters on physical quantities are examined. The obtained results revealed an enhancement in temperature as well as corresponding thermal boundary layer thickness with volume fraction of both types of carbon nanotubes. Due to higher density and thermal conductivity, SWCNTs offer higher skin friction and Nusselt number. Engine oil base fluid depicted higher heat transfer rate and local skin friction than water based fluid for both type of carbon nanotubes. Residual error are plotted to check the accuracy of obtained results. Comparison with previously published literature is made and an excellent agreement is observed which validate our applied numerical scheme. (C) 2017 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
机译：分析了旋转水和发动机油流体的三维（3D）流动。纳米（NM）尺寸单（SWCNT）和多壁碳纳米管（MWCNT）的效果在流动和传热特性上进行检查。使用类似体积的单壁和多壁碳纳米管（CNT）的热导率和粘度来研究水和发动机油基础流体中的热流体性能。控制局部微分方程被转换为非线性，耦合的常微分方程，其使用准线性化和Chebyshev伪光谱方法的组合在数值上进行解决。检查了相关参数对物理量的影响。所得结果揭示了温度的增强以及具有两种类型的碳纳米管的体积分数的相应热边界层厚度。由于较高的密度和导热性，SWCNT提供更高的皮肤摩擦和营养数。发动机油基础流体描绘了较高的传热速率和局部皮肤摩擦，而是两种碳纳米管的水的流体。绘制残余误差以检查所获得的结果的准确性。制作了与先前发表的文献的比较，观察到验证我们应用的数值方案的良好协议。 （c）2017年日本粉末科技学会。由elsevier b.v发表。和日本粉末科技会。版权所有。

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