Research On Thermal Analysis And Optimization Of Air-cooled Heat Sinks

With the quickly development of electronics industry, the number of transistors integrated in CPU (Central Processing Unit) grows rapidly (from 2,300 in 1990 to 230,000,000 nowadays), and the line width of chip reduces rapidly. As a result, the power and the heat in CPU grow sharply, which results in that the function of CPU is impacted. Thus, the improvement of cooling performance of heat sinks becomes one of the key issues in electronic manufacture field. In this thesis, the cooling rules and structure optimization of air cooling system are studied deeply.After the structure characteristics of the existing CPU heat sinks are analyzed, CPU heat sinks analysis software and user interface are developed using UIDL (User-Interface Design Language) of ANSYS and integrated into ANSYS. By using this program, users can analyze the influence of various parameters to cooling performance of CPU heat sinks conveniently and quickly.The optimization process of heat sinks is a circular process of pre-solution, solving and post treatment. On the premise of satisfying the constraint of cooling space, the maximum temperature of heat sinks is minimized. The structure parameters of heat sinks are optimized in order to enhance the cooling performance of heat sinks. The concrete process is as follows: firstly, the design variables and objective function are defined and the optimization algorithms are chosen, secondly, the analysis and optimal control program is developed in ANSYS using ADPL (ANSYS Parametric Design Language), lastly the optimization module of ANSYS is used to implement the structure parametric optimization of heat sinks.A series of examples of analysis and structure parametric optimization of heat sinks are showed in order to validate the analysis and structure parametric optimization methods proposed in this thesis. Finally, the conclusion of this thesis and the advices for future research are given.