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Experimental study on the flow and heat transfer characteristics of Ag/water and SiO2/water nanofluids flows in helically coiled tubes

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Abstract

The convective heat transfer and friction factor of two different water-based nanofluids, i.e., Ag–water and SiO2–water are examined experimentally in helically coiled tube with uniform heat flux boundary condition. The dynamic viscosity and thermal conductivity of nanofluids are gauged experimentally in different volume fractions and temperatures. The Reynolds number is varied from 1040 to 2120. The effects of geometric characteristics such as pitch circle diameter and coil diameter are also inspected. The outcomes indicate that using nanoparticles in coiled tubes can be more effective in increasing the heat transfer rate than the straight tube. The performance evaluation criterion is calculated and it is found that the highest value is 3.57 for Ag nanofluid in Re = 1336. Finally for predicting the Nusselt number and friction factors, empirical correlations are extracted based on experimental data.

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Abbreviations

\(C_{\text{p}}\) :

Specific heat (J kg−1 K−1)

b :

Helical pitch

d :

Inner diameter (m)

D :

Pitch circle diameter (m)

De :

Dean number

f :

Friction factor

Gz :

Graetz number

\(\bar{h}\) :

Average convective heat transfer coefficient \(( {\text{Wm}}^{ - 2}\,{\text{K}}^{ - 1} )\)

He :

Helical number

I :

Electric current (A)

k :

Thermal conductivity \(( {\text{Wm}}^{ - 1} \,{\text{K}}^{ - 1} )\)

L :

Length of tube (m)

\(\dot{m}\) :

Mass flow rate (kg s−1)

\(\overline{Nu}\) :

Average Nusselt number

\(\Delta p\) :

Pressure drop \(\left( {\text{Pa}} \right)\)

Pr :

Prandtl number

Q ave :

Total average heat transfer (J s−1)

Re :

Reynolds number

\(\overline{{T_{\text{w}} }}\) :

Mean wall temperature (K)

\(T_{\text{m}}\) :

Mean bulk temperature (K)

U:

Average velocity \(( {\text{ms}}^{ - 1} )\)

V:

Voltage (V)

\(\mu\) :

Dynamic viscosity (Pa s)

\(\rho\) :

Density (kg m−3)

\(\varphi\) :

Volume concentration

bf:

Base fluid

c:

Coil tube

nf:

Nanofluid

s:

Straight tube

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Authors and Affiliations

  1. Mechanical Engineering Department, Yazd University, Yazd, Iran

    A. Mokhtari Ardekani & V. Kalantar

  2. Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

    M. M. Heyhat

Authors
  1. A. Mokhtari Ardekani
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  2. V. Kalantar
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  3. M. M. Heyhat
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Correspondence to V. Kalantar.

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Ardekani, A.M., Kalantar, V. & Heyhat, M.M. Experimental study on the flow and heat transfer characteristics of Ag/water and SiO2/water nanofluids flows in helically coiled tubes. J Therm Anal Calorim 137, 779–790 (2019). https://doi.org/10.1007/s10973-018-08001-x

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  • DOI: https://doi.org/10.1007/s10973-018-08001-x

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