平板式熱管輻射狀微流道液壓成形之研究與熱性能測試

Abstract

本研究利用實驗室所研發之高液壓成形機台，針對厚度為0.15mm的商用純銅(C1100)板材，進行平板式熱管輻射狀微流道之液壓成形實驗。同時使用Abaqus/Explicit針對熱管微流道之液壓成形進行數值模擬分析，首先由材料試驗取得板材之材料性質，接著以實測得到之材料性質及模具幾何與液壓實驗之條件為基礎，建立一板液壓成形之有限元素模型，並透過實驗與模擬結果之對照驗證此模型之準確度。 接下來依實際研究過程及結果之有限元素模型預測微流道之成形，決定液壓實驗之實驗參數，最後實際成形所需之輻射狀微流道並製作出微型平板式熱管輻射狀微流道。再以純水為工作流體，探討在不同充填量改變下，平板式輻射狀熱管的熱傳性能之差異性，並實際應用在LED 燈之散熱，探討其實用性。

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. At the same time, finite element analysis (Abaqus/Explicit) was used to analyze the hydroforming process numerically. A finite element model of sheet metal hydroforming was based on material properties gotten from material testing, and conditions of hydroforming. And this research compared the results of simulation and hydroforming experiment to verify the accuracy of the finite element model. After that, this finite element model was used to predict the formability of radial micro-channels to decide experiment parameters of hydroforming. A radial flat heat pipe was assembled with hydroformed radial micro-channels and filled with water as working fluid in vacuum environment. Then, thermal performance experiments were conducted by using different amount of working fluid, and subsequently this radial flat heat pipe was also used on cooling LED practically.