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الثلاثاء، 5 أغسطس، 2014

Three Dimensional Conjugate Heat Transfer in Heat Sinks with Water Cooling in Multi Rows Circular Mini Channels

 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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