Applied Mathematics and Mechanics (English Edition) ›› 2017, Vol. 38 ›› Issue (1): 125-136.doi: https://doi.org/10.1007/s10483-017-2155-6

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Heat transfer of nanofluids considering nanoparticle migration and second-order slip velocity

Jing ZHU1, Shengnan WANG1, Liancun ZHENG1, Xinxin ZHANG2   

  1. 1. Department of Applied Mathematics, University of Science and Technology Beijing, Beijing 100083, China;
    2. Department of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 收稿日期:2016-03-15 修回日期:2016-06-08 出版日期:2017-01-01 发布日期:2017-01-01
  • 通讯作者: Jing ZHU,E-mail:zhujing@ustb.edu.cn E-mail:zhujing@ustb.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Nos. 51476191 and 51406008)

Heat transfer of nanofluids considering nanoparticle migration and second-order slip velocity

Jing ZHU1, Shengnan WANG1, Liancun ZHENG1, Xinxin ZHANG2   

  1. 1. Department of Applied Mathematics, University of Science and Technology Beijing, Beijing 100083, China;
    2. Department of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2016-03-15 Revised:2016-06-08 Online:2017-01-01 Published:2017-01-01
  • Contact: Jing ZHU E-mail:zhujing@ustb.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 51476191 and 51406008)

摘要:

The heat transfer of a magnetohydrodynamics nanofluid inside an annulus considering the second-order slip condition and nanoparticle migration is theoretically investigated. A second-order slip condition, which appropriately represents the non-equilibrium region near the interface, is prescribed rather than the no-slip condition and the linear Navier slip condition. To impose different temperature gradients, the outer wall is subjected to q2, the inner wall is subjected to q1, and q1>q2. A modified two-component four-equation non-homogeneous equilibrium model is employed for the nanofluid, which have been reduced to two-point ordinary boundary value differential equations in the consideration of the thermally and hydrodynamically fully developed flow. The homotopy analysis method (HAM) is employed to solve the equations, and the h-curves are plotted to verify the accuracy and efficiency of the solutions. Moreover, the effects of the physical factors on the flow and heat transfer are discussed in detail, and the semi-analytical relation between NuB and NBT is obtained.

关键词: nanoparticle migration, semi-analytical relation, nanofluid, homotopy analysis method (HAM), second-order slip

Abstract:

The heat transfer of a magnetohydrodynamics nanofluid inside an annulus considering the second-order slip condition and nanoparticle migration is theoretically investigated. A second-order slip condition, which appropriately represents the non-equilibrium region near the interface, is prescribed rather than the no-slip condition and the linear Navier slip condition. To impose different temperature gradients, the outer wall is subjected to q2, the inner wall is subjected to q1, and q1>q2. A modified two-component four-equation non-homogeneous equilibrium model is employed for the nanofluid, which have been reduced to two-point ordinary boundary value differential equations in the consideration of the thermally and hydrodynamically fully developed flow. The homotopy analysis method (HAM) is employed to solve the equations, and the h-curves are plotted to verify the accuracy and efficiency of the solutions. Moreover, the effects of the physical factors on the flow and heat transfer are discussed in detail, and the semi-analytical relation between NuB and NBT is obtained.

Key words: second-order slip, semi-analytical relation, nanoparticle migration, homotopy analysis method (HAM), nanofluid

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