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Numerical investigation of heat transfer of nanofluid flow through a microchannel with heat sinks and sinusoidal cavities by using novel nozzle structure

  • Omid Ali Akbari
  • Erfan Khodabandeh
  • Faramarz Kahbandeh
  • Davood ToghraieEmail author
  • Mohammad Khalili
Article
  • 28 Downloads

Abstract

In this study, we analyze laminar flow for f-GNP nanofluid flow in different concentrations of solid nanoparticles. The computational domain of flow field and heat transfer is 3D, and for Re = 50, 100, 300, 700, a new rectangular microchannel design with cavity will be analyzed. The main objective of this study is determining the effect of boundary condition of inlet velocity for two structures in rectangular microchannel. Other goals of this study are investigating the effect of concentration of solid nanoparticles and Reynolds number on parameters including Nusselt number, friction factor and pressure drop and heat fluid performance evaluation criterion in different fluid and geometric parameters. The results of this study show that changing the direction of fluid at inlet and exit section has an important effect on flow field and heat transfer. Also, by adding a component to fluid velocity at inlet and exit sections, the value of heat transfer and friction factor will be increased. Using microchannel design with dimple can also create a good mixing for fluid during motion. Due to the solid walls, the momentum depreciation is greater in case (1), and also this affects the core regions of the fluid flow. In the microchannel, because of changes in the velocity components in different directions during the entrance of flow in microchannel, the mixing of the fluid for different regions and the amount of heat absorption increase. The existence of cavities in the flow path causes secondary flow to increase the temperature of the fluid during movement. In the microchannel case (2), due to direct fluid movement path, the velocity gradients are reduced and this prevents better mixing of the fluid and the heat transfer. Therefore, the distribution of temperature between the fluids is reduced and the layers of fluid close to the microchannel floor will experience higher temperature in comparison with other regions.

Keywords

Heat transfer Nanofluid flow Microchannel heat sinks Sinusoidal cavities 

List of symbols

A

Area/m2

Cp

Heat capacity/J kg−1 K−1

D

Hydraulic diameter/μm

f

Friction factor

f0

Friction factor for pure fluid

h

Heat transfer coefficient/Wm−2 K

Ha

Depth of the dimple/μm

Hf

Exit length in horizontal fashion/μm

Hs

Height of microchannel/μm

k

Thermal conductivity coefficient/Wm−1 K−1

La

Length of the dimple/μm

Lin

Length of exit/μm

Lt

Length of microchannel/μm

Nu

Nusselt number

Nu0

Nusselt number for pure fluid

P

Fluid pressure/Pa

p

Perimeter/μm

Pr

Prandtl number

q′′

Surface heat flux/W m−2

Re

Reynolds number

T

Temperature/K

u, v, w

Velocity components in x, y and z directions/ms−1

υ

Kinematic viscosity/m2 s−1

Wf

Width of inlet/μm

Ws

Microchannel silicon thickness/μm

x, y, z

Cartesian coordinates

Greek symbols

Δ

Difference

α

Thermal diffusivity/m2 s−1

μ

Dynamic viscosity/Pa s

ρ

Density/kg m−3

υ

Kinematics viscosity/m2 s−1

Super- and sub-scripts

Ave

Average

f

Base fluid (distilled water)

In

Inlet

m

Main

Out

Outlet

S

Surface

Notes

Compliance with ethical standards

Conflict of interest

We have no conflict of interest.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Young Researchers and Elite Club, Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran
  2. 2.Mechanical Engineering DepartmentAmirkabir University of Technology (Tehran Polytechnic)TehranIran
  3. 3.Mechanical Engineering DepartmentIsfahan University of TechnologyIsfahanIran
  4. 4.Department of Mechanical Engineering, Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran

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