由於個人電腦裡CPU的發熱量相當驚人，需要有良好的散熱裝置來降低CPU的溫度，以保持電腦穩定的運作。搭配風扇的鰭片式散熱器是個人電腦上最常見的散熱裝置，使用者可以利用散熱器製造商所提供的總熱阻值來計算出CPU的溫度，但是由於不同風量的總熱阻值並不相同，使用者一旦更換不同風量的風扇後，便無法推算出CPU的溫度。本研究的目的是在合理的假設下利用有限差分方法，以電腦模擬出散熱器在不同風量或熱量條件下的CPU溫度。在可接受的運算時間及誤差範圍內，提供散熱器製造商或使用者能更方便地估算出接近的CPU溫度。 The heat generated by the CPU of a personal computer is amazing. It needs a good heat equipment to decrease the temperature of CPU and to keep the computer at a stable operation. The system of heat sink with a fan and fins is applied in a personal computer mostly today. Manufactures of heat sink offer the overall-resistance-value for PC users to estimate CPU temperature. It has different overall-resistance-value with different flow rate of air, so users can not estimate the CPU temperature when fan is changed.The purpose of this research is to compute the CPU temperature by finite difference method with suitable assumptions and different boundary conditions such as different airflow rates.This research offers a convenience way for manufactures of heat-sink and users of PC to find an approximate CPU temperature in an acceptable error range.
