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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Boundary layer flow over a moving surface in a nanofluid beneath a uniform free stream
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Boundary layer flow over a moving surface in a nanofluid beneath a uniform free stream

机译：边界层在均匀自由流下方的纳米流体中的运动表面上流动

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Purpose - The purpose of this paper is to theoretically investigate the steady two-dimensional boundary-layer flow past a moving semi-infinite flat plate in a water-based nanofluid containing three different types of nanoparticles: copper (cuprum) Cu, alumina (aluminium oxide) AI2O3, and titania (titanium dioxide) TiO2. The effects of moving parameter A as well as solid volume fraction parameter on the flow and heat transfer characteristics are studied. Taking into account the rising demands of modern technology, including chemical production, power stations and microelectronics, there is a need to develop new types of fluids that will be more effective in terms of heat exchange performance. Design/methodology/approach - A similarity transformation is used to reduce the governing partial differential equations to a set of nonlinear ordinary differential equations which are then solved numerically using Keller-box method. Findings - There is a region of unique solutions for A > 0, however, multiple (dual) solutions exist for λ_c < λ≤ 0 and no solutions for λ < λ_c < 0. A reverse flow is formed when λ < 0. Research limitations/implications - The solutions can be obtained up to a certain value of the moving parameter (critical value or turning point). The boundary layer separates from the plate beyond the turning point hence it is not possible to get the solution based on the boundary-layer approximations after this point. To obtain further solutions, the full Navier-Stokes equations have to be solved. Originality/value - The present results are original and new for the boundary-layer flow and heat transfer of a moving flat plate in a nanofluid. Therefore, this study would be important for the scientists and engineers in order to become familiar with the flow behaviour and properties of such nanofluids, and the way to predict the properties of this flow for the process equipments.
机译：目的-本文的目的是从理论上研究在包含三种不同类型的纳米粒子的水基纳米流体中流过移动的半无限平板的稳定二维边界层流：铜（铜）Cu，氧化铝（铝）氧化物）Al 2 O 3和二氧化钛（二氧化钛）TiO 2。研究了运动参数A以及固相体积分数参数对流动和传热特性的影响。考虑到包括化学生产，发电站和微电子学在内的现代技术的日益增长的需求，需要开发在热交换性能方面将更加有效的新型流体。设计/方法/方法-使用相似变换将控制性偏微分方程简化为一组非线性常微分方程，然后使用Keller-box方法对其进行数值求解。研究结果-对于A> 0，存在一个唯一解的区域，但是，对于λ_c<λ≤0，存在多个（对偶）解，对于λ<λ_c<0，没有解。当λ<0时，形成逆流。研究局限性/含义-最多可以获取运动参数的某个值（临界值或转折点）的解。边界层在转折点之外与板分开，因此无法基于该点之后的边界层近似值获得解。为了获得进一步的解决方案，必须求解完整的Navier-Stokes方程。原创性/价值-对于纳米流体中移动平板的边界层流动和传热，目前的结果是新颖的。因此，这项研究对于科学家和工程师来说，对于熟悉此类纳米流体的流动行为和特性，以及预测工艺设备的这种流动特性的方式而言，将是重要的。

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