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Influence of Geometry and Magnetic Field on Convective Flow of Nanofluids in Trapezoidal Microchannel Heat Sink

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Iranian Journal of Science and Technology, Transactions of Mechanical Engineering Aims and scope Submit manuscript

Abstract

The objective of the numerical study is to explore the effects of transverse magnetic field on heat transfer and fluid flow characteristics in a trapezoidal microchannel heat sink. The effects of the channel bottom width, channel top width, channel height and Hartmann number on heat transfer and fluid flow characteristics are widely investigated. In addition, effects of nanoparticles type (Al2O3, SiO2, CuO, ZnO), base fluid type (water and ethylene glycol) and its concentration (0–4%) under the influence of magnetic field are also investigated. The governing equations for three-dimensional steady, laminar flow and conjugate heat transfer of a microchannel are solved using the finite volume method. The acquired results are discussed in detail. The results reveal that the magnetic field can increase the thermal performance.

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Abbreviations

B o :

Magnetic field strength

C p :

Heat capacity (J/kg k)

D :

Channel depth (m)

D h :

Hydraulic diameter (2WchD/Wch + D) (m)

f :

Friction factor (f = 2ΔPD/ρV2L)

h :

Heat transfer coefficient (W/m2. K)

Ha:

Hartmann number (BoDh(σ/µ)1/2)

k :

Thermal conductivity (W/m K)

L :

Channel length

M :

Molecular weight (mol)

N :

Avogadro number

Nu:

Nusselt number (Nu = hDh/k)

P :

Pressure (Pa)

Re:

Reynolds number (Re = ρVDh/µ)

T :

Temperature (K)

V :

Velocity (m/s)

W :

Total channel width

W ch :

Channel width

κ :

Boltzmann constant

σ :

Electrical conductivity (S/m)

ρ :

Density (kg/m3)

μ :

Dynamic viscosity (kg m/s)

Ø :

Volume fraction of nanoparticle

ch:

Channel

top:

Top

bottom:

Bottom

bf:

Base fluid

eff:

Effective

nf:

Nanofluid

np:

Nanoparticle

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Authors and Affiliations

  1. Department of Mathematics, King Abdulaziz University, Jeddah, 21589, Saudi Arabia

    S. Sivasankaran

  2. Department of Mechanical Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia

    K. Narrein

Authors
  1. S. Sivasankaran
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  2. K. Narrein
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Correspondence to S. Sivasankaran.

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Sivasankaran, S., Narrein, K. Influence of Geometry and Magnetic Field on Convective Flow of Nanofluids in Trapezoidal Microchannel Heat Sink. Iran J Sci Technol Trans Mech Eng 44, 373–382 (2020). https://doi.org/10.1007/s40997-018-0258-6

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  • DOI: https://doi.org/10.1007/s40997-018-0258-6

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