平板式熱管微流道液壓成形之研究與熱性能測試

Abstract

本研究運用實驗室所研發之高液壓成形試驗機，成形出寬度比傳統沖壓製程更細小之微流道，以應用於平板式熱管之毛細結構中。研究中使用材料為厚度0.15mm之銅(C1100)薄板，進行液壓成形平板式熱管微流道之研究。同時利用有限元素模擬軟體Abaqus/Standard針對熱管微流道之液壓成形進行數值模擬分析，匯入材料試驗所得到銅之材料參數，考量模具幾何與其它邊界條件，來建立有限元素模型，並與實驗結果比較，驗證此模型之準確性。 經由有限元素模型預測微流道之成形性，在不同成形壓力下，實際成形出所需之各種微流道尺寸，將成形完之試片作為毛細組織，組裝成一平板式熱管，並在真空環境中填入水為工作流體進行熱性能測試，探討在不同的微流道深度、熱管填充率及熱管工作角度下，對於平板式熱管的熱傳性能之差異性。

In this study, a high-pressure hydroforming apparatus with a maximum working pressure of 250MPa was used to fabricate the wick structures for the flat heat pipe. Copper sheets (C1100) with a thickness of 0.15 mm were tested in the hydroforming experiment. Simultaneously, finite element analysis (Abaqus / Standard) was used to analyze the hydroforming process numerically, and this research compared the results of simulation and hydroforming experiments to verify the accuracy of the finite element model. Subsequently, this finite element model was used to predict the formability, and dimensions of formed microchannels using difference working pressures. A flat heat pipe was assembled with hydroformed microchannels and filled with water as working fluid in a vacuum environment. Them, thermal performance experiments were conducted using different dimensions of microchannels, different amount of working fluid, and different inclination angles.