Advertisement

Heat transfer enhancement in a curved tube by using twisted tape insert and turbulent nanofluid flow

An experimental study
  • Arash Rezaei Gorjaei
  • Azadeh ShahidianEmail author
Article
  • 40 Downloads

Abstract

In this experimental study, twisted tape insert and nanofluid turbulent flow (passive techniques) are considered to increase the heat transfer in the curved tube. The curved tube and twisted tape are fabricated from the copper. The test section (curved tube) is submerged inside a pool filled with hot water. To prepare water/Al2O3 nanofluid, a three-step procedure is utilized. The influences of volume flow rate, nanoparticles concentration, and twisted tape insert on the convective heat transfer coefficient, Nusselt number, and Darcy friction factor are studied. The results show that the curved tube with twisted tape insert improves the convective heat transfer coefficient up to 31%. But enhancing Al2O3 concentration from 0 to 1% increases convective heat transfer coefficient up to 21%. On the other hand, the twisted tape and adding nanoparticle affect Darcy friction factor, and it is greater than that without twisted tape and base fluid. In addition, the Darcy friction factor declines by increment of volume flow rate. Ultimately, the current article presents a new twisted tape as passive enhancement technique.

Keywords

Nanofluid Pressure drop Nusselt number Twisted tape insert Darcy friction factor 

List of symbols

A

Area (m2)

a

Ring width (m)

b

Rings distance (m)

Cp

Specific heat (J kg−1 K−1)

D

Diameter (m)

d

Ring outer diameter (m)

f

Darcy friction factor

h

Convective heat transfer coefficient (W m−2 K−1)

k

Thermal conductivity (W m−1 K−1)

L

Length (m)

\(\mathop m\limits^{.}\)

Mass flow rate (kg s−1)

Nu

Nusselt number

p

Pressure (Pa)

Q

Volume flow rate (L min−1)

\(\dot{Q}\)

Heat transfer rate (W)

Re

Reynolds number

T

Temperature (K)

t

Ring thickness (m)

V

Velocity

Greek letters

μ

Dynamic viscosity (Ns m−2)

ρ

Density (kg m−3)

\(\phi\)

Volume concentration

Subscripts

f

Fluid

h

Hot

i

Inner

in

Inlet

m

Mean

nf

Nanofluid

o

Outer

out

Outlet

p

Particle

s

Base case

w

Wall

Notes

References

  1. 1.
    Yadav RJ, Kore S, Raibhole VN, Joshi PS. Development of correlations for friction factor and heat transfer coefficient for square and hex duct with twisted tape insert in laminar flow. Proc Eng. 2015;127:250–7.CrossRefGoogle Scholar
  2. 2.
    Bas H, Ozceyhan V. Heat transfer enhancement in a tube with twisted tape inserts placed separately from the tube wall. Exp Thermal Fluid Sci. 2012;41:51–8.CrossRefGoogle Scholar
  3. 3.
    Choi SUS, Eastman JA. Enhancing thermal conductivity of fluids with nanoparticles. ASME Int Mech Eng Congr Expos. 1955;66:99–105.Google Scholar
  4. 4.
    Mashayekhi R, Khodabandeh E, Akbari OA, Toghraie D, Bahiraei M, Gholami M. CFD analysis of thermal and hydrodynamic characteristics of hybrid nanofluid in a new designed sinusoidal double-layered microchannel heat sink. J Therm Anal Calorim. 2018;134:2305–15.CrossRefGoogle Scholar
  5. 5.
    Ahmadi AA, Khodabandeh E, Moghadasi H, Malekian N, Akbari OA, Bahiraei M. Numerical study of flow and heat transfer of water-Al2O3 nanofluid inside a channel with an inner cylinder using Eulerian–Lagrangian approach. J Therm Anal Calorim. 2018;132:651–65.CrossRefGoogle Scholar
  6. 6.
    Mahian O, Kolsi L, Amani M, Estelle P, Ahmadi G, Kleinstreuer C, et al. Recent advances in modeling and simulation of nanofluid flows—part I: fundamental and theory. Phys Rep. 2018.  https://doi.org/10.1016/j.physrep.2018.11.004.Google Scholar
  7. 7.
    Mahian O, Kolsi L, Amani M, Estelle P, Ahmadi G, Kleinstreuer C, et al. Recent advances in modeling and simulation of nanofluid flows—part II: applications. Phys Rep. 2018.  https://doi.org/10.1016/j.physrep.2018.11.003.Google Scholar
  8. 8.
    Rezaei Gorjaei A, Soltani M, Bahiraei M, Kashkooli FM. CFD simulation of nanofluid forced convection inside a three-dimensional annulus by two-phase mixture approach: heat transfer and entropy generation analyses. Int J Mech Sci. 2018;146:396–404.CrossRefGoogle Scholar
  9. 9.
    Bahiraei M, Rezaei Gorjaei A, Shahidian A. Investigating heat transfer and entropy generation for mixed convection of CuO–water nanofluid in an inclined annulus. J Mol Liq. 2017;248:36–47.CrossRefGoogle Scholar
  10. 10.
    Bennia A, Bouaziz MN. CFD modeling of turbulent forced convective heat transfer and friction factor in a tube for Fe3O4 magnetic nanofluid in the presence of a magnetic field. J Taiwan Inst Chem Eng. 2017;78:127–36.CrossRefGoogle Scholar
  11. 11.
    Bahiraei M. A numerical study of heat transfer characteristics of CuO–water nanofluid by Euler–Lagrange approach. J Therm Anal Calorim. 2016;123:1591–9.CrossRefGoogle Scholar
  12. 12.
    Goharkhah M, Ashjaee M. Effect of an alternating non uniform magnetic field on ferrofluid flow and heat transfer in a channel. J Magn Magn Mater. 2014;362:80–9.CrossRefGoogle Scholar
  13. 13.
    Heshmatian S, Bahiraei M. Numerical investigation of entropy generation to predict irreversibilities in nanofluid flow within a microchannel: effects of Brownian diffusion, shear rate and viscosity gradient. Chem Eng Sci. 2017;172:52–65.CrossRefGoogle Scholar
  14. 14.
    Sheikhnejad Y, Hosseini R, Saffar Avval M. Experimental study on heat transfer enhancement of laminar ferrofluid flow in horizontal tube partially filled porous media under fixed parallel magnet bars. J Magn Magn Mater. 2017;424:16–25.CrossRefGoogle Scholar
  15. 15.
    Sivashanmugam P, Suresh S. Experimental studies on heat transfer and friction factor characteristics of turbulent flow through a circular tube fitted with regularly spaced helical screw-tape inserts. Appl Therm Eng. 2007;27:1311–9.CrossRefGoogle Scholar
  16. 16.
    Saeed M, Kim MH. Heat transfer enhancement using nanofluids (Al2O3–H2O) in mini-channel heatsinks. Int J Heat Mass Transf. 2018;120:671–82.CrossRefGoogle Scholar
  17. 17.
    Coleman HW, Steele WG. Experimental and uncertainty analysis for engineers. Hoboken: Wiley; 1989.Google Scholar
  18. 18.
    Bianco V, Manca O, Nardini S. Entropy generation analysis of turbulent convection flow of Al2O3–water nanofluid in a circular tube subjected to constant wall heat flux. Energy Convers Manage. 2014;77:306–14.CrossRefGoogle Scholar
  19. 19.
    Brinkman HC. The viscosity of concentrated suspensions and solutions. J Chem Phys. 1952;20:571.CrossRefGoogle Scholar
  20. 20.
    Hamilton R, Crosser O. Thermal conductivity of heterogeneous two-component systems. Ind Eng Chem Fundam. 1962;1(3):187–91.CrossRefGoogle Scholar
  21. 21.
    Notter RH, Rouse MW. A solution to the Graetz problem—III. Fully developed region heat transfer rates. Chem Eng Sci. 1972;27:2073–93.CrossRefGoogle Scholar
  22. 22.
    Webb RL. Performance evaluation criteria for use of enhanced heat transfer surfaces in heat exchanger design. Int J Heat Mass Transf. 1981;24(4):715–26.CrossRefGoogle Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringK. N. Toosi University of TechnologyTehranIran

Personalised recommendations