悬浮纳米颗粒与Cattaneo-Christov热通量在Jeffrey流体中的自由对流换热

B. Vasu, A. Ray, R. Gorla
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引用次数: 5

摘要

研究了杰弗里纳米流体在垂直板上的自由对流流动及其表面温度和物质浓度的正弦变化。分别采用Cattaneo-Christov热流密度模型和Buongiorno热流密度模型对纳米流体的传热和输运进行了研究。控制流的方程使用适当的转换是无量纲化的。在此基础上,利用局部相似和局部非相似的方法,将方程简化为非线性耦合方程组,再用同伦分析法求解。通过与已有文献结果的比较,验证了所得结果的正确性。数值计算结果与计算结果吻合较好。得到了不同物理参数(如Deborah Number、Prandtl Number、Schmidt Number、热泳参数、布朗运动参数和浮力比参数)的影响,并给出了图形。并给出了表面温度和物种浓度的正弦变化对表面摩擦系数、努塞尔数和舍伍德数的影响。杰弗里纳米流体的速度大于牛顿纳米流体,而温度和纳米颗粒浓度小于牛顿纳米流体。热松弛时间的增大导致换热系数的增大。观察到,在远离垂直壁面的地方,Cattaneo-Christov热通量模型的温度比经典傅立叶模型的温度要低。这类边界层流动问题存在于垂直薄膜太阳能集热器、粮食储运发电、保温隔热、采气、石油资源、地热储层等领域。
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Free convective heat transfer in Jeffrey fluid with suspended nanoparticles and Cattaneo–Christov heat flux
Free convection flow of Jeffrey nanofluid past a vertical plate with sinusoidal variations of surface temperature and species concentration is presented. The study of heat transfer and nanofluid transport has been done by employing Cattaneo–Christov heat flux model and Buongiorno model, respectively. Equations governing the flow are non-dimensionalized using appropriate transformations. Furthermore, the method of local similarity and local non-similarity is used to reduce the equations into non-linear coupled system of equations which are then solved by homotopy analysis method. The obtained results are validated by comparing with the existing results available in the literature. The numerical results are found to be in good agreement. The effects of varying the physical parameters such as Deborah Number, Prandtl number, Schmidt number, thermophoresis parameter, Brownian motion parameter and buoyancy ratio parameter are obtained and presented graphically. The effect of sinusoidal variation of surface temperature and species concentration on the skin friction coefficient, Nusselt number and Sherwood number is also shown. Velocity for Jeffrey nanofluid is more than the Newtonian nanofluid while temperature and nanoparticle concentration for Jeffrey nanofluid is less than the Newtonian nanofluid. Raising value of thermal relaxation times leads to an increase in the heat transfer coefficient. It is observed that temperature of Cattaneo–Christov heat flux model is less than that in classical Fourier’s model away from the vertical wall. These types of boundary layer flow problems are found in vertical film solar energy collector, grain storage, transportation and power generation, thermal insulation, gas production, petroleum resources, geothermal reservoirs.
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来源期刊
CiteScore
6.00
自引率
1.70%
发文量
24
期刊介绍: Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems is a peer-reviewed scientific journal published since 2004 by SAGE Publications on behalf of the Institution of Mechanical Engineers. The journal focuses on research in the field of nanoengineering, nanoscience and nanotechnology and aims to publish high quality academic papers in this field. In addition, the journal is indexed in several reputable academic databases and abstracting services, including Scopus, Compendex, and CSA's Advanced Polymers Abstracts, Composites Industry Abstracts, and Earthquake Engineering Abstracts.
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