Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 3, pp 1611–1628 | Cite as

The effect of rib shape on the behavior of laminar flow of oil/MWCNT nanofluid in a rectangular microchannel

  • Mohammad Reza Gholami
  • Omid Ali Akbari
  • Ali Marzban
  • Davood Toghraie
  • Gholamreza Ahmadi Sheikh Shabani
  • Majid Zarringhalam


In this research, the laminar and forced flow and heat transfer of oil/multi-walled carbon nanotubes nanofluid in a microchannel have been numerically investigated. The studied geometrics is a two-dimensional rectangular microchannel with the proportion of length to height of 150 (L/d = 150). The purpose of this research is to investigate the effect of using rectangular, oval, parabolic, triangular and trapezoidal rib shapes on behavior and heat transfer of nanofluid flow in the rectangular microchannel. This research has been simulated in Reynolds numbers of 1, 10, 50 and 100 and volume fractions of 0, 2 and 4% of nanoparticles by using finite volume method. The results of this research indicate that the existence of ribs enhances the friction factor and Nusselt number, significantly. Also, the shape of rib is one of the most important factors for determining the behavior and heat transfer of cooling fluid flows. Among the investigated rib shapes, the parabolic rib, comparing to the augmentation of friction factor, has the best proportion of Nusselt number enhancement.


Nanofluid Rectangular microchannel Laminar flow Rib Multi-walled carbon nanotubes (MWCNT) 

List of symbols


Area (m2)


Friction factor


Heat capacity (Jkg−1 K−1)


Microchannel height (μm)


Ribbed height (m)


Thermal conductivity coefficient (Wm−1 K−1)


Inlet microchannel length (m)


Microchannel length (m)


Ribbed length (m)


Nusselt number


Fluid pressure (Pa)


Ribbed pitch (m)


Peclet number

Pr = (υf)/αf

Prandtl number

Re = (ρfu H)/μf

Reynolds number


Temperature (K)

U, V

Dimensionless velocity components in x, y directions

X, Y

Cartesian dimensionless coordinates

u, v

Velocity components in x, y directions (ms−1)


Inlet velocity in x directions (ms−1)


Brownian motion velocity (ms−1)


Outlet microchannel length (m)

Greek symbols


Thermal diffusivity (m2 s−1)


Nanoparticles volume fraction


Boltzmann constant (JK−1)


Dynamic viscosity (Pa s)


Dimensionless temperature


Density (kg m−3)


Kinematics viscosity (m2 s−1)

Super- and subscripts






Base fluid (oil)








Solid nanoparticles


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2017

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Aligoudarz BranchIslamic Azad UniversityAligoudarzIran
  2. 2.Young Researchers and Elite Club, Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran
  3. 3.Department of Mechanical Engineering, Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran
  4. 4.Young Researchers and Elite Club, South Tehran BranchIslamic Azad UniversityTehranIran

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