Electrohydrodynamic free convection heat transfer of a nanofluid in a semi-annulus enclosure with a sinusoidal wall
Electrohydrodynamic free convection heat transfer of a nanofluid in a semi-annulus enclosure with a sinusoidal wall
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DOI：
10.1080/10407782.2015.1090819
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发表时间：
2016-01-01
影响因子：
2
通讯作者：
Chamkha, Ali J.
中科院分区：
文献类型：
--
作者：
Sheikholeslami, Mohsen;Chamkha, Ali J.
研究了电场作用下纳米流体的自然对流换热。采用控制体积有限元法（CVFEM）对该问题进行了数值模拟。采用Fe 3 O 4-乙二醇纳米流体作为工作流体。考虑了电场对纳米流体粘度的影响。数值研究进行了几个值的瑞利数，纳米粒子的体积分数，和所提供的电压。数值计算结果表明，施加电压可以改变流场的形状。库仑力使等温线在靠近底壁处变得更致密。传热量随电压和瑞利数的增加而增加。电场对传热的影响在低瑞利数时更为明显，这是由于传导机制占主导地位。
Natural convection heat transfer of a nanofluid in the presence of an electric field is investigated. The control volume finite element method (CVFEM) is utilized to simulate this problem. A Fe3O4-ethylene glycol nanofluid is used as the working fluid. The effect of the electric field on nanofluid viscosity is taken into account. Numerical investigation is conducted for several values of Rayleigh number, nanoparticle volume fraction, and the voltage supplied. The numerical results show that the voltage used can change the flow shape. The Coulomb force causes the isotherms to become denser near the bottom wall. Heat transfer rises with increase in the voltage supplied and Rayleigh number. The effect of electric field on heat transfer is more pronounced at low Rayleigh numbers due to the predomination of the conduction mechanism.