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Heat and Mass Transfer

, Volume 52, Issue 12, pp 2735–2746 | Cite as

SiO2 nanofluid planar jet impingement cooling on a convex heated plate

  • Neda Asghari Lafmajani
  • Mahsa Ebrahimi BidhendiEmail author
  • Mehdi Ashjaee
Original

Abstract

The main objective of this paper is to investigate the heat transfer coefficient of a planar jet of SiO2 nanofluid that impinges vertically on the middle of a convex heated plate for cooling purposes. The planar jet issues from a rectangular slot nozzle. The convex aluminum plate has a thickness, width and length of 0.2, 40 and 130 mm, respectively, and is bent with a radius of 200 mm. A constant heat-flux condition is employed. 7 nm SiO2 particles are added to water to prepare the nanofluid with 0.1, 1 and 2 % (ml SiO2/ml H2O) concentrations. The tests are also performed at different Reynolds numbers from 1803 to 2782. Results indicate that adding the SiO2 nanoparticles can effectively increase both local and average heat transfer coefficients up to 39.37 and 32.78 %, respectively. These positive effects often are more pronounced with increasing Reynolds numbers. This enhancement increases with ascending the concentration of nanofluid, especially from 0.1 to 1 %.

Keywords

Heat Transfer Reynolds Number Heat Transfer Coefficient Nusselt Number Stagnation Point 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

A

Surface area of the target plate (m2)

d

Width of planar jet on the collision course (m)

d0

Width of the planar jet at the moment of fluid discharging (m)

g

Gravitational acceleration (m/s2)

h

Local heat transfer coefficient (W/m2 K)

havg

Average heat transfer coefficient (W/m2 K)

H

Nozzle-to-plate spacing (m)

I

Electric current (A)

I0

Length of the planar jet (m)

L

Length of the convex plate (m)

mp

Particle mass (kg)

q

Total power input (W)

Q

Flow rate of fluid flow (m3/s)

r

The calculated result

Re

Reynolds number

Rej

Reynolds number of the jet

Tf

Bulk temperature of the fluid (K)

Tw

Plate surface temperature (K)

U

Fluid velocity on the collision course (m/s)

U0

Average velocity of the planar jet at the moment of fluid discharging (m/s)

V

Voltage (V)

VP

Particle volume (m3)

Vt

Total volume (m3)

W

Width of the convex plate (m)

wj

Uncertainty of the measurement

Wr

Uncertainty of the result

x

Space from the stagnation point in the x direction (mm)

Xj

J measured variable

Greek symbols

φ

Volume fraction of nanoparticles in nanofluid

ρbf

Density of base fluid (kg/m3)

ρp

Density of particle (kg/m3)

ρnf

Density of nanofluid (kg/m3)

μbf

Dynamic viscosity of base fluid (kg/ms)

μnf

Dynamic viscosity of nanofluid (kg/ms)

υ

Kinematic viscosity of fluid flow (m2/s)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Neda Asghari Lafmajani
    • 1
  • Mahsa Ebrahimi Bidhendi
    • 1
    Email author
  • Mehdi Ashjaee
    • 1
  1. 1.Department of Mechanical EngineeringUniversity of TehranTehranIran

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