本文係利用數值模擬方法，探討毛細多孔介質對於冷板在散熱效能上之影響。文中分析了冷板之三維模型，其中包含多孔介質區域的動量修正及加入毛細效應的動量源。並使用計算流體力學軟體CFX進行模擬與實驗結果作為比較。根據簡化模型初步分析的結果，冷板具有優異的溫度擴散效果，可以有效避免熱點(hot spot)現象。其內部的毛細多孔層無論在流動或是熱傳方面皆有所影響。此外在計算中加入毛細力的影響與原先的熱阻值約有3%的差距。 其次使用冷板真實模型分別就探討燒結層厚度、孔隙度、使用Darcy與Darcy-Forchheimer兩種多孔介質理論和不同毛細理論的差異以及冷板最大負載功率進行探討。分析結果顯示，孔隙度在0.65以及燒結層厚度在0.8mm時，冷板有最低的熱阻值。而且在發熱量逐漸上升其熱阻反而降低，在180W時有最低值。使用不同的多孔介質模式對冷板的熱傳行為並沒有太大的影響。但是使用不同毛細理論的結果相差了約3~5%。而使用Lago的毛細效應理論其模擬結果與實驗誤差僅2.67%較為接近。 The main object of this thesis is to discuss the effect on heat dissipate by capillary porous media inside cold plate. The three-dimension model of cold plate has been analyzed theoretically including momentum modification by porous media and momentum source due to capillary effect. Then compare with the experiment result and simulation result using computer fluid dynamic software CFX. According to the basic analysis on simplified model, cold plate has excellent ability in spreading temperature to avoid the hot spot problem. The capillary porous media inside cold plate has effects both in flow and heat transfer. Besides it is about 3% difference in thermal resistance between including capillary force and not. In further analysis of the real model shows it has minimum thermal resistance when the porosity is 0.65 and porous thickness is 0.8mm. The thermal resistance of decrease when heating rate increase and has minimum value in 180W. The different porous model has few influence in heat transfer but 3~5% different when use different capillary model. Using Lago’s model has good agreement with the experiment result which has 2.67% error.
