Thermal Characterization Numerical Analysis And The Optimization Design Of Heat Sink

At first, the physical mechanism was studied then the 2D compact numerical simulation model for natural convection and forced convection heat transfer analysis was built respectively. Based on the computational model, the universal discrete equation was deduced to calculate temperature field, velocity field and pressure field, the numerical analysis of thermal characteristics of the section bar heat sinks undergoing the natural and forced convection cooling was offered respectively. In the process of analyzing the air flow field and temperature field between the ribs of heat sinks finite difference method was implemented, meanwhile the SIMPLEC method was used to calculate the flow field. The calculated results showed that the temperature and velocity field distributed symmetrically, there was a negative pressure field between the two ribs of the heat sink which undergoing natural convection cooling, and the heat transfer coefficient of the surface of the forced convection conditions varied mildly, the numerical results met with the experiment preferably. The experimental and theoretic heat transfer correlations of the parallel plate channels was used for reference to deduce a simple and applied computational method to calculate the thermal resistance of heat sinks, and a procedure was written.The thermal resistance was chosen as the optimization objective, under some constrains, the software Qfin was employed. Some test sections were machined to conduct experiment, the experimental results agreed well with the calculated results, the validity of the numerical model and the calculate method was proved consequently. The validity of Qfin was proved, too.