International Scientific Journal


In this paper, heat transfer and pressure drop behavior of MWCNT-water nanofluid turbulent flow inside vertical coiled wire inserted tubes with constant heat flux boundary condition were investigated experimentally and numerically. In the experimental section, plain and five wire coil inserted tubes were used as the test section's geometries. In the numerical section, the governing equations associated with the required boundary conditions were solved using finite volume method based on the SIMPLE technique. The standard k-ε turbulence model was used in order to simulate the turbulence flow. The great agreement was found between the obtained experimental and numerical data with those predicted by the classical correlations for heat transfer and pressure drop in the plain tube. After validating the achieved data, the effects of various ranges of Reynolds number, particle weight concentration, wire diameter and coil pitch ratio on heat transfer coefficient and performance evaluation criterion (PEC) were declared. It was concluded that the Nusselt number has been increased up to 102% at the highest Reynolds number inside the coil wire WC3. Moreover, the maximum enhanced PEC was seen for the wire coil with lowest coil pitch-to-tube inner diameter ratio (p/d) and highest wire-to-tube diameter ratio (e/d).
PAPER REVISED: 2016-02-22
PAPER ACCEPTED: 2016-03-17
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THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Issue 1, PAGES [125 - 136]
  1. Choi, S.U.S., Enhancing thermal conductivity of fluids with nanoparticles. ASME FED, 1995. 231: p. 99-105.
  2. D. Wen and Y. Ding., Experimental investigation into convective heat transfer of nanofluid at the entrance region under laminar flow conditions. International Journal of Heat and Mass Transfer, 2004. 47(24): p. 5181-5188.
  3. J. Wang and X.Z. J. Zhu, Y. Chen, Heat transfer and pressure drop of nanofluids containing carbon nanotubes in laminar flows. Experimental Thermal and Fluid Science, 2013(44): p. 716-721.
  4. S.M. Fotukian and M.N. Esfahany, Experimental study of turbulent convective heat transfer and pressure drop of dilute CuO/water nanofluid inside a circular tube. International Communications in Heat and Mass Transfer, 2010. 37: p. 214-219.
  5. A. Behzadmehr, M. Saffar-Avval, and N. Galanis, Prediction of turbulent forced convection of a nanofluid in a tube with uniform heatflux using a two phase approach. International Journal of Heat and Fluid Flow, 2007. 28: p. 211-219.
  6. Mahmoodi, M., Mixed convection inside nanofluid filled rectangular enclosures with moving bottom wall. Thermal science, 2011. 15(3): p. 889-903.
  7. Javad Bayat and A.H. Niksereht, Thermal performance and pressure drop analysis of nanofluids in turbulent forced convective flows. International Journal of Thermal Sciences, 2012. 60: p. 236-243.
  8. Soltanipour, H., P. Choupani, and I. Mirzaee, Numerical analysis of heat transfer enhancement with the use of γ-Al2O3/water nanofluid and longitudinal ribs in a curved duct. Thermal science, 2012. 16(2): p. 469-480.
  9. Kshirsagar, J.M., R. Shrivastava, and P.S. Adwani, Charicterization and investigation of heat transfer enhancement in pool boiling with water-ZnO nano-fluid. Thermal Science, 2015(00): p. 200-200.
  10. A. Akbarinia and R. Laur, Investigating the diameter of solid particles effects on a laminar nanofluid flow in a curved tube using a two phase approach. International Journal of Heat and Fluid Flow, 2009. 30(4): p. 706-714.
  11. R. Mokhtari Moghari, A.A., M. Shariat, F. Talebi, R. Laur, Two phase mixed convection Al2O3-water nanofluid flow in an annulus. International Journal of Multiphase Flow 2011. 37(6): p. 585-595.
  12. A. Garcia, P.G. Vicente, and A. Viedma, Experimental study of heat transfer enhancement with wire coil inserts in laminar-transition - turbulent regimes at different Prandtl numbers. International Journal of Heat and Mass Transfer, 2005. 48: p. 4640-4651.
  13. M.A. Akhavan-Behabadi, R.K., M.R. Salimpour, R. Azimi, Pressure drop and heat transfer augmentation due to coiled wire inserts during laminar flow of oil inside a horizontal tube. International Journal of Thermal Sciences, 2010. 49: p. 373-379.
  14. R.C. Prasad and J. Shen, Performance evaluation using exergy analysis eapplication to wire-coil inserts in forced convection heat transfer. International Journal of Heat and Mass Transfer, 1994. 37(15): p. 2297-2303.
  15. Akhavan-Behabadi, M., M. Shahidi, and M. Aligoodarz, An experimental study on heat transfer and pressure drop of MWCNT-water nano-fluid inside horizontal coiled wire inserted tube. International Communications in Heat and Mass Transfer, 2015. 63: p. 62-72.
  16. S.J. Kline and F.A. Mcclintock, Describing uncertainties in single-sample experiments. Mechanical Engineering, 1953. 75: p. 3-8.
  17. Eiamsa-ard, S. and P. Promvonge, Numerical study on heat transfer of turbulent channel flow over periodic grooves. International Communications in Heat and Mass Transfer, 2008. 35(7): p. 844-852.
  18. Vanaki, S.M., et al., Effect of nanoparticle shapes on the heat transfer enhancement in a wavy channel with different phase shifts. Journal of Molecular Liquids, 2014. 196: p. 32-42.
  19. Mohammed, H., H.A. Hasan, and M. Wahid, Heat transfer enhancement of nanofluids in a double pipe heat exchanger with louvered strip inserts. International Communications in Heat and Mass Transfer, 2013. 40: p. 36-46.
  20. Launder, B.E. and D. Spalding, The numerical computation of turbulent flows. Computer methods in applied mechanics and engineering, 1974. 3(2): p. 269-289.
  21. Gnielinski, V., New equations for heat and mass transfer in turbulent pipe and channel flow International Chemical Engineering, 1976. 16: p. 359-368.
  22. Incropera, F.P. and D.P. Dewitt, Introduction to Heat Transfer (1996). John WHey & Sons. New York. NY.
  23. Webb, R., Performance evaluation criteria for use of enhanced heat transfer surfaces in heat exchanger design. International Journal of Heat and Mass Transfer, 1981. 24(4): p. 715-726.

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