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Heat transfer performance of submerged impinging jet using silver nanofluids

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Abstract

Silver–water nanofluids used in this paper, has been prepared by a one step method adopting an ultrasound-assisted membrane reaction. Experimental investigations on heat transfer of submerged jet in plate and pin–fin heat sinks were carried out with different concentrations of silver nanofluids. The results indicate that the silver nanoparticles can be uniformly distributed in the base fluid with an average grain size of 4.8 nm. The used surfactant had a great influence on the viscosity of the nanofluids. Compared with the base fluid (water and surfactant), the heat transfer coefficient of the nanofluids, for the same jet velocity, increases in average by 6.23, 9.24 and 17.53 % for the silver nanoparticles weight fractions of 0.02, 0.08 and 0.12 %, respectively. Compared with water, the heat transfer coefficient is enhanced by 6.61 % with a silver nanoparticles weight fraction of 0.12 %. The Nu of pin fin heat sink are obviously higher than that of plate one, at corresponding Re. The exit of nanoparticles can intense internal energy transmission of fluids, and then enhance the heat transfer, while the Re is small.

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Abbreviations

d :

Diameter of jet (mm)

D :

Diameter of heat transfer surface (mm)

H :

Length of jet (mm)

H s :

Thickness of jet board (mm)

k :

Thermal conductivity (W m−1 K−1)

L :

Characteristic length (mm)

n :

Number of jet hole

q :

Heat flux (W m−2)

Q v :

Volume flow of fluid (ml min−1)

S :

Spacing of jet (mm)

T w :

Mean temperature of heat transfer surface (K)

T nf :

Inlet temperature of nanofluids (K)

u :

Jet velocity (m s−1)

μ :

Fluid dynamic viscosity (Pa s)

ν nf :

Kinematic viscosity of nanofluids (m2 s−1)

ρ :

Fluid density (kg m−3)

φ m :

Particle weight fraction of (%)

φ v :

Particle volume fraction of (%)

Φ s :

Diameter of jet board (mm)

p:

Nanoparticles

f:

Base fluid

nf:

Nanofluids

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Acknowledgments

The work is supported by the National Natural Science Foundation of China (51176002), the National Basic Research Program of China (2011CB710704) and the Research Fund for the Doctoral Program of Higher Education (20111103110009).

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Authors and Affiliations

  1. State Nuclear Power Technology Research and Develop Center, SNPTRD, Beijing, 100190, China

    Mingzheng Zhou

  2. Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, 100124, China

    Guodong Xia & Lei Chai

Authors
  1. Mingzheng Zhou
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  2. Guodong Xia
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  3. Lei Chai
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Correspondence to Mingzheng Zhou.

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Zhou, M., Xia, G. & Chai, L. Heat transfer performance of submerged impinging jet using silver nanofluids. Heat Mass Transfer 51, 221–229 (2015). https://doi.org/10.1007/s00231-014-1387-0

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  • DOI: https://doi.org/10.1007/s00231-014-1387-0

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