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Experimental study on the heat transfer and flow properties of Ag–ethylene glycol nanofluid as a coolant

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Abstract

The heat transfer and flow characteristics of silver (Ag) Ethylene glycol (EG) nanofluids, flowing through a tubular heat exchanger were experimentally investigated. The spherically shaped Ag nanoparticles of an average size of 10–65 nm were dispersed in EG in a 0.1–2.0 vol%. The test results reveal that the convective heat transfer coefficient and pressure drop of the Ag–EG nanofluids increased from 39.5 to 49 and 1.42 to 23.7 % respectively, with increased nanoparticles concentration.

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Abbreviations

A:

Surface area, m2

C:

Specific heat capacity, J/(kg K)

D:

Inner tube diameter, m

L:

Length of the tube, m

f:

Friction factor

h:

Convective heat transfer coefficient, W/(m2 K)

K:

Thermal conductivity, W/(m K)

m:

Mass flow rate, kg/s

Re:

Reynolds number

Nu:

Nusselt number

Pr:

Prandtl number

Pe:

Peclet number

∆p:

Pressure drop, Pa

v:

Volume, m3

Q:

Heat transfer rate, W

Qave :

Average heat transfer rate, W

T:

Temperature, K

T(mean) :

Bulk temperature of the nanofluid, K

Twall :

Average temperature of the wall, K

∆Tlm :

Logrithmic mean temperature difference, K

U:

Overall heat transfer coefficient, W/(m2 K)

um :

Mean velocity of the nanofluid, m/s

m:

Dynamic viscosity, Pas

ρnf = ρeff:

Density of the nanofluid, kg/m3

α:

Thermal diffusivity, m2/s

Øp:

Particle volume concentration (%)

δt:

Tube thickness, m

ave:

Average

bf:

Base fluid

c:

Cold

h:

Hot

i:

Inside

in:

Inlet

m:

Mean

nf = eff:

Nanofluid

o:

Outside

out:

Outlet

p:

Nanoparticle

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Acknowledgments

The authors gratefully acknowledge the financial support extended by the DST, New Delhi, to carry out this research work under SERC Fast Track Proposals for Young Scientists scheme (DST Sanction order No. SR/FTP/ETA-07/2009). The authors would also like to thank. R. Parameshwaran, Centre for Nanoscience and Technology, Anna University, Chennai, for his assistance in nanomaterials’ preparation and characterisation. The authors are also grateful to Dr. Parvathi for her valuable comments and suggestions on the language used in the manuscript. The authors express their sincere thanks to the Editor and Reviewers for their positive criticism and constructive advice.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Anna University, Chennai, 600 025, India

    D. Madhesh & S. Kalaiselvam

  2. Department of Applied Science and Technology, Anna University, Chennai, 600 025, India

    D. Madhesh & S. Kalaiselvam

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  1. D. Madhesh
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  2. S. Kalaiselvam
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Correspondence to S. Kalaiselvam.

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Madhesh, D., Kalaiselvam, S. Experimental study on the heat transfer and flow properties of Ag–ethylene glycol nanofluid as a coolant. Heat Mass Transfer 50, 1597–1607 (2014). https://doi.org/10.1007/s00231-014-1370-9

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  • DOI: https://doi.org/10.1007/s00231-014-1370-9

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