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Wings shape effect on behavior of hybrid nanofluid inside a channel having vortex generator

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Abstract

Thermal and flow characteristics of hybrid nanofluid inside a channel having vortex-generator with different wing shapes, is investigated numerically. Three different wing shapes, including rectangular, triangular, and trapezoidal, are considered. The geometrical configuration considered in this work is representative of a channel with three wings in each row; one mounted to the top plate and the other ones mounted to the bottom plate and this trend changes between the plates alternately. MgO-MWCNT (50:50) suspended in the ethylene glycol (EG) as base fluid with volume fractions of 0.1%, 0.2%, 0.4%, and 0.6% is considered as working fluid. The effects of volume fraction of the nanoparticles and type of wings in the Reynolds number range of 200–1600, are investigated. Heat transfer coefficient, pressure drop and performance evaluation criterion (PEC) are the most important parameters that investigated at different flow conditions. The results shown that rectangular wings leads to increase the heat transfer coefficient. In addition the channel with trapezoidal and triangular wings at the same volume fraction, have the higher values of PEC due to lower pressure drop. Also the result indicated that heat transfer coefficient are enhanced by increasing the nanoparticles volume fraction. According to obtained results, the trapezoidal wings with nanofluid volume of fraction of 0.6 and minimum Reynolds number leads to desirable performance from heat transfer and fluid flow viewpoint.

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Abbreviations

Ac :

minimum free flow area (m2)

At :

total surface area in contact with working fluid (m2)

Cp :

specific heat (J kg-1 K-1)

Dh :

hydraulic diameter (m)

Fh :

fin height (m)

FP :

fin pitch (m)

h:

effective heat transfer coefficient (W m-2 K-1)

k:

turbulent kinetic energy

L:

channel length (m)

\( \dot{m} \) :

mass flow rate (kg s-1)

nt :

number of tabs

\( \dot{Q} \) :

convective heat transfer rate (W)

Rh :

rectangular wing height (m)

Rw :

rectangular wing width (m)

T:

temperature (K)

Th :

triangular wing height (m)

Tw :

triangular wing width (m)

T:

fin thickness (m)

U:

velocity (m s-1)

Vl :

longitudinal vortex spacing (m)

Vt :

transverse vortex spacing (m)

wh :

trapezoidal wing height (m)

∆P:

pressure drop (Pa)

∆T:

temperature difference (K)

x,y,z:

Cartesian coordinates

ρ :

density (kg m-3)

μ :

dynamic viscosity (kg m-1 s-1)

λ :

thermal conductivity (W m-1 K-1)

φ :

solid volume fraction

δ :

Kronecker delta

σ K :

effective Prandtl number

σ ε :

Schmidt number

ε :

rate of dissipation

ave:

average

b:

Bulk

bf:

base fluid

conv:

Convective

f:

Fluid

i,j:

x direction, y direction

LMTD:

Logarithmic Mean Temperature Difference

in:

inlet

nf:

Nanofluid

out:

outlet

w:

Wall

f :

friction factor

Nu:

Nusselt number

PEC:

performance evaluation criterion

Re:

Reynolds number

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Acknowledgements

The authors wish to thank the Energy Research Institute and the Research & Technology Administration of the University of Kashan for their support regarding this research (Grant No. 785398).

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Authors and Affiliations

  1. Mechanical Engineering Department, University of Kashan, Kashan, Iran

    Ghanbar Ali Sheikhzadeh, Faezeh Nejati Barzoki & Ali Akbar Abbasian Arani

  2. Mechanical and Aerospace Engineering Department, Malek-Ashtar University of Technology, Shahinshahr, Isfahan, Iran

    Farzad Pourfattah

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  1. Ghanbar Ali Sheikhzadeh
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  2. Faezeh Nejati Barzoki
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Correspondence to Ghanbar Ali Sheikhzadeh.

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Sheikhzadeh, G.A., Barzoki, F.N., Arani, A.A.A. et al. Wings shape effect on behavior of hybrid nanofluid inside a channel having vortex generator. Heat Mass Transfer 55, 1969–1983 (2019). https://doi.org/10.1007/s00231-018-2489-x

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