Research Papers: Forced Convection

Experimental Investigation and Three-Dimensional Numerical Analysis of Ferroconvection Through Horizontal Tube Under Magnetic Field of Fixed Parallel Magnet Bars

[+] Author and Article Information
Yahya Sheikhnejad

Mechanical Engineering Department,
Amirkabir University of Technology,
Tehran 15875-4413, Iran;
Instituto de Telecomunicações,
Universidade de Aveiro,
Aveiro 3810-193, Portugal
e-mail: yahya@ua.pt

Mir Mehrdad Hosseini, Reza Hosseini, Majid Saffar Avval

Mechanical Engineering Department,
Amirkabir University of Technology,
Tehran 15875-4413, Iran

Antonio Teixeira, Ali Shahpari

Instituto de Telecomunicações,
Universidade de Aveiro,
Aveiro 3810-193, Portugal

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received December 14, 2016; final manuscript received April 27, 2017; published online June 6, 2017. Assoc. Editor: Peter Vadasz.

J. Heat Transfer 139(10), 101703 (Jun 06, 2017) (10 pages) Paper No: HT-16-1811; doi: 10.1115/1.4036620 History: Received December 14, 2016; Revised April 27, 2017

This study includes experimental and three-dimensional numerical analysis of conjugate steady-state laminar forced ferroconvection of Newtonian incompressible ferrofluid through a horizontal circular pipe under constant heat flux and in presence of transverse magnetic field. The magnetic field was applied by two fixed parallel magnet bars at the beginning of the tube. To validate the thermohydrodynamic characteristics obtained by numerical results, appropriate experimental setup with accurate instrumentations was conducted. Based on presence and absence of porous media and solid rod inside of pipe, six conditions were compared for quantifying the heat transfer enhancement and effectiveness. Governing equations were discretized by finite volume method (FVM) and solved using the semi-implicit method for pressure linked equations (SIMPLE) algorithm and computational fluid dynamic (CFD) techniques. It was found that magnetic field, porous media, and solid rod increase heat transfer and pressure loss in the pipe such that solid rod has the best effect on heat transfer and worst effect on effectiveness.

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Fig. 1

Geometry of thick tube partially filled with porous media (hashed symmetrical rectangle around longitude axis) under constant heat flux

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Fig. 2

(Up) Front and 3D view of tube with structured O-type grid, (down-right) Nusselt number distribution for constant temperature boundary condition over fluid–solid interface with ReD=50 and Pr=0.54, and (down-left) paraboloid profile of axial velocity in a fully developed zone

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Fig. 4

(a) Column of polyester fiber, initial structure of porous media production, (b) porous media: copper, metal foam, and (c) schematic of experimental setup configuration

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Fig. 3

(Up) Two parallel opposite poles of magnet bar and correspondence magnetic field, (down-left) transverse magnetic field perpendicular to flow direction, and (down-right) components of magnetic force in cylindrical coordinate system

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Fig. 5

(a) SEM of nanoparticles, (b) XRD report of nanoparticles, and (c1)–(c3) ferrofluid response to magnetic field of magnet bar in 5, 15, and 30 mm distance, respectively

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Fig. 6

Condition of experiments: pipe in absence of porous media and without magnet bar: (a) oil with Q = 1.8 (L/min) and (b) ferrofluid 2% with Q = 1.4 (L/min)

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Fig. 7

Darcy friction factor for six main conditions

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Fig. 8

Local (a) and mean (b) heat transfer coefficient, for six main conditions

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Fig. 9

Effectiveness parameter: (a) six main conditions and (b) four main conditions (zoomed)

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Fig. 10

Local temperature of outer surface of pipe with two different Re numbers (left) without porous and magnetic field and (right) with porous and without magnetic field

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Fig. 11

Local heat transfer coefficient: (a) in absence of magnetic field and without porous media, (b) in presence of magnetic field and without porous media, and (c) in presence of magnetic field and partially filled with porous media




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