Journal of Computational Electronics, cilt.18, ss.1259-1271, 2019 (SCI İndekslerine Giren Dergi)
Impinging jet is a method for attaining high convective heat transfer coefcients and so increasing the heat transfer from
cooling surfaces. In this work, improvement in the heat transfer from copper plate patterned surfaces having high heat fux
depending on developing technologies in order to solve increased thermal load problem of the electronic equipments such
as microchips are numerically examined by using an impingement jet technique. Five diferent patterned surfaces as reverse
and straight circles are placed inside rectangular channels consisting of one open and three blocked sides. Governing 3D
Navier–Stokes and energy equations as steady are solved by using Ansys Fluent software program with k-ε turbulence model.
Air used as jet fuid has 300-K inlet temperature. A constant heat fux of 1000 W/m2
is implemented to the patterned surfaces
while top and side surfaces are adiabatic. The study is conformed for diferent Re numbers ranging from 4000 to 10000
and diferent jet-to-plate distances (H/Dh) from 4 to 12 for two diferent surface confgurations. The numerical results are
agreed well with numerical and experimental studies existed in the literature. The results are presented as mean Nu numbers
and surface temperature variations for each of the analyzed patterned surfaces. The velocity and temperature contours and
jet fow streamline distributions are assessed for diferent Re numbers and H/Dh ratios. For Re=10000 and H/Dh=12, the
mean Nu number value on the straight-circle-patterned surfaces is 24.13% higher than that of the reverse-circle-patterned.