Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 3, pp 2305–2315 | Cite as

CFD analysis of thermal and hydrodynamic characteristics of hybrid nanofluid in a new designed sinusoidal double-layered microchannel heat sink

  • Ramin Mashayekhi
  • Erfan Khodabandeh
  • Omid Ali Akbari
  • Davood ToghraieEmail author
  • Mehdi Bahiraei
  • Milad Gholami


In this study, laminar and steady flow of hybrid Al2O3–Cu/water nanofluid is done for volume fraction of solid nanoparticles 0–2% in a double-layered microchannel with sinusoidal walls. The results of this study show that the sinusoidal shape of the microchannel walls has a strong effect on increasing heat transfer, and increasing solid nanoparticle volume fraction in base fluid can have a significant difference for increasing Nusselt number, so that the value of Nusselt number for solid nanoparticles volume fraction of 2% for Re = 50, 300, 700 and 1200 experiences 23%, 22% 19% and 13% increase compared with the base fluid. By increasing fluid viscosity, the shear stress especially in the areas close to wall and in fluid layers is increased and this factor can increase pressure drop in higher solid nanoparticles volume fractions. The static temperature profiles are affected by hot surfaces and their sinusoidal shapes in lower Reynolds numbers, and the curve for temperature of flow centerline for Re = 700 and 1200 is straight lines. Therefore, the usage of it for Reynolds numbers above 700 is not recommended.


Thermal Nanofluid Sinusoidal Double-layered Microchannel heat sink 

List of symbols


Reynolds number


Temperature (K)


Specific heat capacity (J kg−1 K−1)


Thermal conductivity (W m−1 K−1)


Nusselt number


Heat flux (W m−2)


Heat transfer coefficient (W m−2 K−1)


Hydraulic diameter (m)


Area (m−2)


Perimeter (m)

Greek symbols


Dynamic viscosity (kg m−1 s−1)


Density (kg m−3)


Volume fractions of nanoparticles (%)





















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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran
  2. 2.Mechanical Engineering DepartmentAmirkabir University of Technology (Tehran Polytechnic)TehranIran
  3. 3.Department of Mechanical EngineeringKermanshah University of TechnologyKermanshahIran

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