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Investigation of flow and heat transfer of nanofluid in microchannel with variable property approach

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Abstract

Laminar flow and heat transfer of water-Al2O3 nanofluid under constant heat flux have been investigated numerically. Single-phase with temperature dependant effective properties has been assumed for fluid. Enhancement in heat transfer and increase in friction factor have been obtained by the use of nanofluid. Heat transfer enhancement is more obvious by the use of variable properties. Also, effects of temperature variation on nanofluid heat transfer are greater than the pure water.

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Abbreviations

A:

Area (m2)

C:

Heat capacity (J/kg K)

D:

Diameter (m)

d:

Diameter (m)

f:

Friction factor

H:

Height (m)

h:

Convective heat transfer coefficient (W/m2 K)

k:

Conductivity (W/m K)

M:

Parameter

N:

Parameter

Nu :

Nusselt number

L:

Length (m)

T:

Temperature (K)

t:

Thickness (m)

U:

Velocity (m/s)

V:

Velocity (m/s)

W:

Width (m)

z:

Axial location (m)

app:

Apparent

ave:

Average

b:

Bulk

bf:

Base fluid

Brownian:

Brownian

c:

Cross section

eff:

Effective

f:

Fluid

h:

Hydraulic

nf:

Nanofluid

p:

Particle

s:

Solid

static:

Static

w:

Wall

z:

Axial location

+:

Non-dimension

*:

Non-dimension

α :

Aspect ratio

β :

Parameter

Γ:

Perimeter (m)

μ :

Viscosity (kg/m s)

ρ :

Density (kg/m3)

ϕ :

Volume fraction

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Authors and Affiliations

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

    Mostafa Mirzaei

  2. Department of Mechanical Engineering, Semnan University, 35196-45399, Semnan, Iran

    Maziar Dehghan

Authors
  1. Mostafa Mirzaei
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  2. Maziar Dehghan
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Correspondence to Mostafa Mirzaei.

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Mirzaei, M., Dehghan, M. Investigation of flow and heat transfer of nanofluid in microchannel with variable property approach. Heat Mass Transfer 49, 1803–1811 (2013). https://doi.org/10.1007/s00231-013-1217-9

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  • DOI: https://doi.org/10.1007/s00231-013-1217-9

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