Natural convection in a nanofluid-filled eccentric annulus with constant heat flux wall: A lattice Boltzmann study with immersed boundary method

被引：20

作者：

Hu, Yang ^{[1
]}

Li, Decai ^{[1
]}

Shu, Shi ^{[2
]}

Niu, Xiaodong ^{[3
]}

机构：

[1] Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing 100044, Peoples R China

[2] Xiangtan Univ, Sch Math & Computat Sci, Xiangtan 411105, Peoples R China

[3] Shantou Univ, Coll Engn, Shantou 515063, Peoples R China

来源：

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER | 2017年 / 86卷

基金：

北京市自然科学基金; 中国国家自然科学基金;

关键词：

Natural convection; Nanofluid; Constant heat flux; Lattice Boltzmann method; Immersed boundary method; SQUARE ENCLOSURE; CIRCULAR-CYLINDER; TRANSFER ENHANCEMENT; FORCED-CONVECTION; RAYLEIGH NUMBER; SIMULATION; MODEL; FLOW; TURBULENCE; VISCOSITY;

D O I：

10.1016/j.icheatmasstransfer.2017.05.015

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A numerical investigation of natural convection in a Cu-water nanofluid-filled eccentric annulus with constant heat flux wall is presented. The governing equations of the flow and temperature fields are solved by lattice Boltzmann method (LBM), and the Dirichlet and Neumann boundary conditions are treated using the immersed boundary method (IBM). Influences of the Rayleigh number (10(3) <= Ra <= 10(7)), eccentricity (epsilon = -0.625,0 and 0.625), nanoparticles volume fraction (0 <= phi <= 0.03) and radial ratio (rr = 2.33,2.6 and 3) on the streamlines, isotherms and Nusselt number are studied. It is found that the inclusion of the nanoparticles into pure fluid changes the flow pattern. And the Nusselt number has a positive relationship with nanoparticle volume fraction, Rayleigh number and radial ratio. Also, it can be confirmed that Nusselt number in the case with negative eccentricity (epsilon = 0.625) is larger than the others.

引用

页码：262 / 273

页数：12

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