Investigation of thermal characteristics of CNF-based nanofluids for electronic cooling applications
A major problem being faced by existing coolants is the limited amount of heat that can be absorbed by the fluids. An innovative way to overcome this limitation is by utilizing a nano-coolant as a heat transfer medium in a cooling application. This paper was aimed at formulating an efficient nano...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Universiti Malaysia Pahang, Malaysia
2016
|
| Subjects: | |
| Online Access: | http://eprints.utem.edu.my/id/eprint/19946/1/Investigation%20of%20thermal%20characteristics%20of%20CNF-based%20nanofluids%20for%20electronic%20cooling%20applications.pdf http://eprints.utem.edu.my/id/eprint/19946/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | A major problem being faced by existing coolants is the limited amount of heat that can
be absorbed by the fluids. An innovative way to overcome this limitation is by utilizing a
nano-coolant as a heat transfer medium in a cooling application. This paper was aimed at
formulating an efficient nanofluid from Pyrograf III HHT24 carbon nanofibers (CNF) in
a base fluid consisting of deionized water (DI) and ethylene glycol (EG) with
polyvinylpyrrolidone (PVP) as the dispersant. The experiment was conducted by setting
the variable weight percentage of CNF from 0.1 wt% to 1.0 wt%, with the base fluid ratio
of 90:10 (DI:EG) weight percent. Then, the thermal properties of the formulated
nanofluids were investigated. The test on the thermal conductivity of the nanofluids
showed that the highest thermal conductivity of 0.642 W/m.K in this experiment was
produced when the concentration of nanofluid is 0.5 wt% at a temperature of 40°C.
Experimental investigations into the forced convective heat transfer performance of the
CNF-based nanofluid in a laminar flow through a mini heat transfer test rig showed that
the presence of nanoparticles enhanced the heat transfer coefficient as opposed to the
original base fluid. The highest heat transfer coefficient was reported using nanofluid with
a concentration of 0.6 wt% at 40°C. The enhancement of the heat transfer coefficient was
due to the higher thermal conductivity value. The Nusselt number was also calculated and
presented in this paper. This study showed that the CNF-based nanofluids have a huge
potential to replace existing coolants in electronic cooling applications. Thus, in order to
commercialize nanofluids in practice, more fundamental studies are needed to understand
the crucial parameters that affect their thermal characteristics.
Keywords: carbon nanofibers; nanofluid; thermal conductivity; heat transfer |
|---|