DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf
ISBN Print: 978-1-56700-356-7
ISSN Online: 2642-3499
ISSN Flash Drive: 2642-3502
NUMERICAL ANALYSIS OF CONVECTIVE HEAT TRANSFER IN A PIN FIN HEAT SINK UNDER NON UNIFORM HEAT FLUX CONDITIONS
ABSTRAKT
In this study, numerical simulations of the flow hydrodynamics and heat transfer
of a heat sink with Diamond shaped pin fins in a staggered array were carried out using FLUENT
6.3 code. The heat sink is bonded flat against the back face of a 10 mm thick silicon mirror.
Conjugated heat transfer in the mirror and the heat sink is considered. The heat sink is 47 arrays of
8 staggered square pin fins, having 1.7mm in width and 1.6 mm in height. The pin fins are
equidistantly spaced with a fluid passage width 0.35 mm. Therefore the cross section is 0.35×1.6
mm2. Water was employed as the cooling liquid and the fin's material is cooper. Inlet mass flow
rate was varied from 0.27 to 2.95 l/min. The first order k-ε turbulence model was used for flow
modeling in the micro-channels. A Gaussian distribution of the heat flux density, with a maximum
at 350 W/cm2, is applied as a boundary condition on the front surface of the mirror. This
distribution corresponds to the light beam at the outlet of the storage booster of electrons in
Synchrotron SOLEIL facility.
The numerical modeling has been validated by comparison the results with the data provided by the
experimental study conducted by A. Hamza (2013). The final objective of this study is to propose
an optimal geometry and arrangement of the pin-fins which leads to a homogeneous temperature
distribution within the mirror. Reduction of the temperature gradient inside the optics will improve
the quality of photon beam-line derived from the Synchrotron SOLEIL.