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Studies on heat transfer in flow of silver nanofluid through a straight tube with twisted tape inserts

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Abstract

Convective heat transfer in the flow of silver nanofluid through a straight tube with twisted tape inserts was investigated experimentally. This straight tube was used as absorber/receiver tube in parabolic trough collector. The experiments were conducted for Reynolds number range 500 < Re < 6000 with twisted tape inserts of different twist ratio range 0.577 < H/D < 1.732. This experimental study shows that twisted tape inserts enhances heat transfer rate in the tube. The heat transfer coefficient and friction factor in the flow of silver nanofliud with 5 % volume fraction (concentration) are higher compared to the flow of water. From this study, Nusselt number, friction factor and enhancement factor are found as 2.0–3.0 times, 10–48.5 and 135–175 %, respectively with silver nanofliud. Finally new possible correlations for predicting heat transfer and friction factor in the flow of silver nanofliud through the straight tube with twisted tape inserts are proposed.

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Abbreviations

c:

Constant

D:

Diameter (m)

f:

Friction factor

H:

Pitch (m)

ha :

Heat transfer coefficient with inserts (W/m2K)

hp :

Heat transfer coefficient without inserts (W/m2K)

havg :

Average heat transfer coefficient(W/m2K)

q:

Heat transferred (W)

Re :

Reynolds number

Ts :

Wall Temperature (°C)

Tb :

Mean (bulk) temperature (°C)

Nu :

Nusselt number

Pr :

Prandtl number

α:

Helix angle or twist angle

η:

Enhancement factor (%)

ρb :

Density of fluid (kg/m3)

ϕ:

Concentration (volume fraction)

exp:

Experimental

na:

Nonanofliud

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Acknowledgments

We acknowledge our sincere thanks to Dr. N. K. Sane, Professor, Pune University for his contribution for our experimental work. We also acknowledge our sincere thanks to BCUD, Pune University, for funding for our experimental work.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Government College of Engineering, Aurangabad, India

    D. R. Waghole, R. M. Warkhedkar, V. S. Kulkarni & R. K. Shrivastva

Authors
  1. D. R. Waghole
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  2. R. M. Warkhedkar
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  3. V. S. Kulkarni
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  4. R. K. Shrivastva
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Correspondence to D. R. Waghole.

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Waghole, D.R., Warkhedkar, R.M., Kulkarni, V.S. et al. Studies on heat transfer in flow of silver nanofluid through a straight tube with twisted tape inserts. Heat Mass Transfer 52, 309–313 (2016). https://doi.org/10.1007/s00231-015-1563-x

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  • DOI: https://doi.org/10.1007/s00231-015-1563-x

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