Abstract
Due to their compact design, ease of manufacture and high efficiency in heat and mass transfer, helically coiled tubes are widely used in a number of industries and processes such as in the food, nuclear, aerospace and power generation industries and in heat recovery, refrigeration, space heating and air-conditioning processes. Due to the formation of a secondary flow, which inherently enhances the mixing of the fluid, helically coiled tubes are known to yield enhanced heat transfer characteristics when compared to straight tube heat exchangers. The secondary flow is perpendicular to the axial fluid direction and reduces the thickness of the thermal boundary layer. Goering et al. [1] estimated the secondary flow to account for circa 16–20% of the mean fluid flow velocity.
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Abbreviations
- bf :
-
Base fluid
- c :
-
Coil
- crit :
-
Critical
- eff :
-
Effective
- f :
-
Frictional
- h :
-
Hydraulic diameter
- nf :
-
Nanofluid
- np :
-
Nanoparticle
- s :
-
Straight tube
- tb :
-
Tube
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Acknowledgements
The authors of the current investigation would like to thank the University of Central Lancashire, UK, for facilitating the completion of this study as well as the various authors who have been contacted during the course of this study.
Notation List
C p Specific heat (J/kgK)
d Tube diameter (m)
di Molecule or particle diameter (m)
D Helix diameter (m)
De Dean number (−)
h Convective heat transfer coefficient (W/m2K)
H Pitch (m)
k Thermal conductivity (W/mK)
M Molecular weight (mol/g)
N Avogadro constant (−)
ΔP Frictional pressure drop (Pa)
Re Reynolds number (−)
T Temperature (K)
T o Reference temperature (K)
Greek Symbols
β Modelling function (−)
δ Curvature ratio (d h /D c) (−)
η Performance index (−)
κ Boltzmann constant (J/K)
μ Dynamic viscosity (Pa s)
ρ Density (kg/m3)
φ Volume concentration (−)
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Fsadni, A.M., Whitty, J.P.M., Adeniyi, A.A., Simo, J., Brooks, H.L. (2018). A Review on the Application of Nanofluids in Coiled Tube Heat Exchangers. In: Jackson, M., Ahmed, W. (eds) Micro and Nanomanufacturing Volume II. Springer, Cham. https://doi.org/10.1007/978-3-319-67132-1_15
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DOI: https://doi.org/10.1007/978-3-319-67132-1_15
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