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Experimental study on the convective heat transfer performance and pressure drop of functionalized graphene nanofluids in electronics cooling system

  • Vishnuprasad S
  • Haribabu KEmail author
  • Perarasu V.T
Original
  • 17 Downloads

Abstract

Cooling of electronic equipment has gained significant importance in thermal management systems as a result of the increase of power densities in micro-electronic equipment. This present work investigates the convective cooling performance of microwave assisted acidic functionalized graphene – deionized water nanofluid. The nanofluid possess high dispersion stability (Zeta potential < −40 mV) in the pH range (6–8) and a thermal conductivity enhancement of 55.38% compared to base fluid. The heat transfer performance of the nanofluid was studied by investigating the effect of volume fraction (0 to 0.2 vol.%) and flow rate (5 ml/s to 10 ml/s) on the convective heat transfer coefficient, processor core temperature, and pressure drop. An increase in the convective heat transfer coefficient of about 78.5%, a decrease in the core temperature of about 15% and an average increase of 5% in pressure drop were obtained for the maximum concentration and flow rate of the nanofluid. The results concluded that acidic functionalization of graphene nanoparticle has a significant influence on the increase in the thermo-fluid properties of nanofluid and thus can be used as an efficient heat transfer fluid, compared to conventional coolants.

Keywords

Nanofluid Microwave assisted functionalization Thermophysical properties Electronic cooling Convective heat transfer coefficient Pumping power 

Nomenclature

A

surface area (m2)

as

surface area of nanoparticles (m2/g)

C

specific heat (J/kg0C)

D

mean pore diameter (m)

dH

Hydraulic diameter (m)

h

convective heat transfer coefficient (W/m2.0C)

hth

Theoretical convective heat transfer coefficient

k

thermal conductivity (W/m.0C)

L

Length of the channel (m)

m

mass flow rate (kg/s)

Nu

Nusselt number

Q

volumetric flow rate (m3/s)

q

Heat flux (W/m2)

Re

Reynolds number

T

temperature (°C)

Vm

pore volume distribution (cm3/g)

v

velocity (m/s)

Greek symbols

Ф

nanoparticle volume fraction

μ

Dynamic viscosity (kg/m.sec)

μw

Dynamic viscosity (kg/m.sec) of fluid at surface

∆P

pressure drop (Pa)

ρ

density (kg/m3)

Subscripts

core

processor core

eff

effective

f

fluid

in

inlet.

np

nanoparticles

nf

nanofluid

out

outlet.

p

particles

pow

power

Abbrevations

DI

de ionized

MAAFG

microwave assisted acidic functionalized graphene

Notes

Compliance with ethical standards

Conflict of Interest

The authors wish to confirm that there are no known conflicts of interest associated with this publication.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Chemical EngineeringNational Institute of Technology CalicutKozhikodeIndia
  2. 2.Department of Chemical Engineering, AC Tech CampusAnna UniversityChennaiIndia

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