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Combination of nanofluid and inserts for heat transfer enhancement

Gaps and challenges

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Journal of Thermal Analysis and Calorimetry Aims and scope Submit manuscript

Abstract

Improving heat transfer is a critical subject for energy conservation systems which directly affects economic efficiency of these systems. There are active and passive methods which can be employed to enhance the rate of heat transfer without reducing the general efficiency of the energy conservation systems. Among these methods, passive techniques are more cost-effective and reliable in comparison with active ones as they have no moving parts. To achieve further improvements in heat transfer performances, some researchers combined passive techniques. This article performs a review of the literature on the area of heat transfer improvement employing a combination of nanofluid and inserts. Inserts are baffles, twisted tape, vortex generators, and wire coil inserts. The progress made and the current challenges for each combined system are discussed, and some conclusions and suggestions are made for future research.

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Abbreviations

d, D :

Inner diameter of tube (m)

d p :

Nanoparticle diameter (nm)

D h :

Hydraulic diameter (m)

e :

Wire diameter (m)

e l :

Winglets–length ratio (-)

e p :

Winglets–pitch ratio (-)

e w :

Winglets–width ratio (-)

f :

Friction factor (-)

h :

Twist tape pitch (m)

H :

Pitch of twisted tape (m)

I p :

Longitudinal pitch (m)

l :

Twist length (m)

L :

Duct length (m)

N :

Number of tapes (-)

Nu :

Nusselt number (-)

p :

Pitch ratio (-)

p :

Perimeter of tube (m)

p :

Power (W)

Pr :

Prandtl number (-)

Re :

Reynolds number (-)

S :

Tube surface (m2)

T :

Tape thickness (m)

t p :

Transverse pitch (m)

w :

Tape width (m)

w h :

Wing height (m)

w w :

Wing width (m)

y :

Twist length (m)

Y :

Twist ratio (-)

y o :

Overlapped pitch length of tape (m)

x :

Axial distance (m)

f :

Base fluid

m :

Bulk

nf:

Nanofluid

p :

Particle

TA:

Twisted tape with alternate axis

TT:

Typical twisted tape

α :

Wing attach angle (°)

α f :

Area modification factor (°)

β :

Wing attack angle (°)

μ :

Dynamic viscosity (kg m−1 s−1)

φ :

Solid volume fraction of nanoparticles (-)

CNT:

Carbon nanotube

DW:

Delta wing

DWP:

Delta winglet

HL:

High to low

LH:

Low to high

MWCNT:

Multiwall carbon nanotubes

PEC:

Performance evaluation criterion

RW:

Rectangular wing

RWP:

Rectangular winglet

U:

Uniform

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Acknowledgements

S. Poncet acknowledges the support of the NSERC chair on industrial energy efficiency funded by Hydro-Québec, Natural Resources Canada (CanmetENERGY) and Rio Tinto Alcan.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, 91775-1111, Iran

    S. Rashidi

  2. Department of Mechanical Engineering, Semnan University, P.O. Box: 35196-45399, Semnan, Iran

    M. Eskandarian

  3. Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Laboratory (FUTURE Lab.), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok, 10140, Thailand

    O. Mahian

  4. Department of Mechanical Engineering, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada

    S. Poncet

Authors
  1. S. Rashidi
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  2. M. Eskandarian
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  3. O. Mahian
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  4. S. Poncet
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Corresponding author

Correspondence to S. Poncet.

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Rashidi, S., Eskandarian, M., Mahian, O. et al. Combination of nanofluid and inserts for heat transfer enhancement. J Therm Anal Calorim 135, 437–460 (2019). https://doi.org/10.1007/s10973-018-7070-9

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  • DOI: https://doi.org/10.1007/s10973-018-7070-9

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