Heat and Mass Transfer

, Volume 54, Issue 3, pp 685–696 | Cite as

Turbulent forced convection of nanofluids downstream an abrupt expansion

Original
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Abstract

Turbulent forced convection of Nanofluids through an axisymmetric abrupt expansion is investigated numerically in the present study. The governing equations are solved by ANYS 14.0 CFD code based on the finite volume method by implementing the thermo-physical properties of each nanofluid. All results are analyzed through the evolutions of skin friction coefficient and Nusselt number. For each nanofluid, the effect of both volume fraction and Reynolds number on this type of flow configuration, are examined. An increase on average Nusselt number with the volume fraction and Reynolds number, are highlighted and correlated. Two relationships are proposed. The first one, determines the average Nusselt number versus Reynolds number, volume fraction and the ratio of densities of the solid particles to that of the base fluid (\( \overline{Nu}=f\left(\operatorname{Re},\phi, \frac{\rho_s}{\rho_f}\right) \)). The second one varies according Reynolds number, volume fraction and the conductivities ratio of solid particle to that of the base fluid (\( \overline{Nu}=f\left(\operatorname{Re},\phi, \frac{k_s}{k_f}\right) \)).

Keywords

Abrupt expansion Forced convection Nanofluids Turbulent flow Turbulence modeling 

Nomenclature

Cf

skin friction coefficient (−)

turbulent modeling constant (−)

I0

turbulence intensity (−)

k

kinetic energy (m2 s−2)

Nu

Nusselt number (−)

P

mean static pressure (Pa)

Pr

Prandtl number (−)

Re

Reynolds number (−)

T

mean temperature (K)

To

ambient temperature (K)

Tw

wall temperature (K)

U, V

Velocity components (m s−1)

Greek characters

σ

Diameters ratio (−)

β

expansion coefficient (1/K)

κ

thermal diffusivity (m2 s−1)

ε

dissipation (m2 s−3)

ρ

density (kg m−3)

ϕ

nanoparticles volume fraction (−)

μ

dynamic viscosity (N s m−2)

μt

eddy viscosity (N s m−2)

Subscripts

nf

nanofluid

f

Fluid

s

solid

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Theoretical and Applied Laboratory of Fluid Mechanics, Faculty of PhysicsUniversity of Science and Technology Houari Boumedienne – USTHBAlgiersAlgeria

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