Author : Mohamed Medhat Mahmoud Sourour
Degree : M.Sc. Mechanical
Title: Three Dimensional Conjugate Heat Transfer in Heat Sinks with Water
Cooling in Multi Rows Circular Mini Channels
Abstract
This thesis is devoted to study
numerically three dimensional flow and conjugate heat transfer in circular mini
channels-based multi rows heat sink for electronic packaging applications. The
governing equations of the incompressible laminar flow specifically the
continuity, Navier-Stokes equations of motions and energy equations for water
flow and solid are numerically solved using the generalized single equation
framework for solving conjugate problems. The numerical computations are
carried out using FLUENT 6.3 commercial package with GAMBIT as a CAD and
meshing software are used to solve this research problem. The hydrodynamic and
thermal characteristics under different mini-channel dimensions and many
channel rows are investigated. Effects of thermal geometrical parameters
including: channel dimensions, channel arrangements (Inline or staggered) and
number of channel rows with a single pass flow on the thermal performance of
the heat sink are presented and discussed. The detailed temperature
distributions through the mini channel region, the average heat transfer
coefficient, the thermal resistance, as well as the pressure DROP are reported
and -discussed. The number of rows and the diameter of the circular channel for
a constant Reynolds number are found to have a remarkable cooling effect on the
heat sink. The maximum heat flux applied to the heat sink from the electronic
chip is computed based on an 80°C bottom surface temperature constrain was
reported as a cooling capacity measure of heat sink for all the 15 different
geometries selected. It was found out that in the case of using four channel
rows with channel diameter of Irnm, the cooling capacity is 88.5W/cm2 compared
to 28W/cm2 for a single row 1 mm diameter.
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