Heat transfer in staggered oblique fin microchannels
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Date
2018-05
Authors
Nurhamizah Sahar
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Abstract
Enhancement of the heat transfer performance in microchannel heat sink to
handle the increased dissipation of heat from electronic components is continuously
improved. Similar with oblique fin, staggered oblique fin also provides a secondary flow
which improved the fluid mixing which enhance heat transfer. However, staggered
oblique fin has much more breakage due to the staggered designs that improved the
regeneration of the flow causing it to always be in developing state. This re-initialization
of the flow effecting the thickness of the thermal boundary layer to be reduced and
increasing the pressure drop thus resulting a better heat transfer performance. Therefore,
two models of staggered oblique fins which differs in the height of staggered positions
are modelled in order to modulate the flow in microchannel heat sinks. The Navier Stokes momentum equation, continuity equation an energy equation are solved
simultaneously by ANSYS FLUENT 18.1. Heat flux of 65 W/cm2 and inlet velocity is
fixed. The pressure drop and temperature difference of the outlet and inlet of the flow in
both of the staggered oblique fins are higher compared to the oblique fins. The proposed
modification is found to be one of the effective ways to enhance the heat transfer
performance in microchannel heat sink.