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An empirical investigation on thermal characteristics and pressure drop of Ag-oil nanofluid in concentric annular tube

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Abstract

In this work an experimental study on Silver-oil nanofluid was carried out in order to present the laminar convective heat transfer coefficient and friction factor in a concentric annulus with constant heat flux boundary condition. Silver-oil nanofluid prepared by Electrical Explosion of Wire technique with no nanoparticles agglomeration during nanofluid preparation process and experiments. The average sizes of particles were 20 nm. Nanofluids with various particle Volume fractions of 0.011, 0.044 and 0.171 vol% were employed. The nanofluid flowing between the tubes is heated by an electrical heating coil wrapped around it. The effects of different parameters such as flow Reynolds number, tube diameter ratio and nanofluid particle concentration on heat transfer coefficient are studied. Results show that, heat transfer coefficient increased by using nanofluid instead of pure oil. Maximum enhancement of heat transfer coefficient occurs in 0.171 vol%. In addition the results showed that, there are slight increases in pressure drop of nanofluid by increasing the nanoparticle concentration of nanofluid in compared to pure oil.

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Abbreviations

f :

Darcy–Weisbach friction factor

k :

Thermal conductivity (W/m K)

c p :

Specific heat (J/kg K)

D :

Round tube diameter (m)

D h :

Concentric annular tube hydraulic diameter (m)

h :

Convective heat transfer coefficient (W/m2 K)

\(\bar{h}\) :

Mean convective heat transfer coefficient (W/m2 K)

L :

Length of the tube (m)

Nu :

Nusselt number

P :

Tube cross section perimeter (m)

Pe :

Peclet number

q″ :

Heat flux (W/m2)

T :

Temperature (K)

Re :

Reynolds number

X :

Distance from entrance of tube (m)

\(\Delta P\) :

Pressure drop along the test section (Pa)

µ:

Dynamic viscosity (Pa.s)

ρ:

Density (kg/m3)

ψ :

Weight concentration

bf :

Base fluid

nf :

Nanofluid

I :

Inlet

m :

Mean fluid bulk temperature

s :

Surface

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Authors and Affiliations

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

    A. A. Abbasian Arani

  2. Department of Mechanical Engineering, Islamic Azad University, Takestan Branch, Takestan, Iran

    H. Aberoumand & S. Aberoumand

  3. Aerospace Engineering Department, K.N. Toosi University of Technology, Tehran, Iran

    A. Jafari Moghaddam

  4. Mechanical Engineering Department, University of Sistan & Baluchestan, Zahedan, Iran

    M. Dastanian

Authors
  1. A. A. Abbasian Arani
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  2. H. Aberoumand
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  3. S. Aberoumand
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  4. A. Jafari Moghaddam
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  5. M. Dastanian
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Correspondence to H. Aberoumand.

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Abbasian Arani, A.A., Aberoumand, H., Aberoumand, S. et al. An empirical investigation on thermal characteristics and pressure drop of Ag-oil nanofluid in concentric annular tube. Heat Mass Transfer 52, 1693–1706 (2016). https://doi.org/10.1007/s00231-015-1686-0

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  • DOI: https://doi.org/10.1007/s00231-015-1686-0

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