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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Unsteady conjugate heat transfer with combined effects of MHD and moving conductive elliptic object in CNT-water nanofluid with ventilation ports
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Unsteady conjugate heat transfer with combined effects of MHD and moving conductive elliptic object in CNT-water nanofluid with ventilation ports

机译：具有通风口的CNT水纳米流体中MHD和移动导电椭圆物体的综合共轭热传递，具有通风口的CNT水纳米流体

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Purpose - The purpose of this paper is to analyze the unsteady conjugate mixed convective heat transfer characteristics in a vented porous cavity under the combined effects of moving conductive elliptic object and magnetic field. Design/methodology/approach - The finite element method and arbitrary Lagrangian-Eulerian (ALE), impacts of Reynolds number, Hartmann number, aspect ratio of the conductive ellipse and moving speed of the object on the hydro-thermal performance are analyzed. Findings - It was observed that the dynamic characteristics of the local and average Nu number of each hot wall are different. Magnetic field strength increment resulted in the enhancement of average Nu number for bot steady and transient case while the optimum case for best hydro-thermal performance is achieved for highest Ha number and non-dimensional time of 10. Higher value of average Nu and lower pressure coefficient are achieved for aspect ratio of 4 and non-dimensional time of 10. When the moving velocity of the conductive ellipse is considered, 42% enhancement in the average Nu is obtained at non-dimensional time of 20 and object velocity equals to 0.012 times entering fluid velocity in the negative y direction while the pressure coefficient is higher. The moving object is used as a useful tool to control the dynamic features of heat transfer in a vented cavity. Originality/value - The present method of convective heat transfer control inside a vented cavity with a moving elliptic object is novel and can be used as an effective tool with magnetic field effects owing to diverse use of convection in cavities with vented ports in many practical thermal engineering systems.
机译：目的 - 本文的目的是在移动导电椭圆物对象和磁场的组合效应下分析在排出的多孔腔中的不稳定缀合物混合的对流传热特性。分析了设计/方法/方法 - 分析了有限元方法和任意拉格朗日 - 欧拉（ALE），雷诺数，哈特曼数，导电椭圆和对象移动速度的纵横比对水热性能的影响。结果 - 观察到，每个热墙的局部和平均NU数的动态特性是不同的。磁场强度增量导致机器人稳定和瞬态外壳的平均NU编号的增强，而最佳水热性能的最佳情况是为了获得最高的HA编号和无尺寸时间为10.平均高压值较高，压力更高对于宽高比为4和非尺寸时间来实现系数。当考虑导电椭圆的移动速度时，在20的非尺寸时间和物体速度等于0.012次的情况下获得平均nu的42％增强在压力系数更高时进入负方向的流体速度。移动物体用作控制排气腔中的传热的动态特征的有用工具。原创性/值 - 具有移动椭圆物体的通风腔内的对流传热控制的本方法是新颖的，可以用作磁场效应的有效工具，由于在许多实际的热量中具有排气口的空腔中的腔中的对流使用。工程系统。

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