Heat Dissipation Enhancement Using Staggered Fin Heat Sink
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Date
2022-07-24
Authors
Ong, Zi Hui
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The current study focuses on the computational evaluation of the heat
dissipation of staggered plate fin heat sinks (PFHS). The simulation setup consists of
an aluminium alloy 6061 heat sink exposed to impinging air flow with Reynolds number
in the range of 1333 to 5334 at 25 ℃. A constant heat flux of 18750 𝑊𝑚−2
is applied
at the bottom surface of the heat sink. A parametric study is carried out to study the
influences of the geometric and flow parameters on the heat sink performance. The
results show that the staggered PFHS shows a lower thermal resistance and higher
pumping power required as compared with the conventional PFHS. Among the
inclination angles studied involving θ = 0˚, 30˚, 60˚, 90˚, alternating 30˚, and alternating
60˚, the staggered PFHS with θ = 90˚ shows the highest increase in both Nusselt number
and pumping power required in comparison to the conventional PFHS, whereas
configuration with θ = 0˚ yields the best trade-off between Nusselt number and pumping
power required. Alternating the θ = 30˚ and θ = 60˚ configurations result in better heat
dissipation performance of the heat sink in comparison to that without alternation, albeit
with an increase in the pumping power required. As 𝑆𝐿/𝐿 increases from 0.81 to 1, the
thermal resistance of the heat sink decreases slightly while the pumping power of the
heat sink increases. The longitudinal fin pitch of the heat sink has no significant effect
on its trade-off between Nusselt number and pumping power required. As compared
with the staggered PFHS with wall, the no wall configuration exhibits a slightly lower
thermal resistance but a lower average Nusselt number. The no wall configuration
shows a lower pumping power required, as well as a better trade-off performance
between Nusselt number and pumping power.