本研究之目的為製造高效能之燒結與溝槽複合式毛細結構微熱管，以應用於新型電腦之高性能散熱模組，其原理是採溝槽式毛細結構來加強燒結式毛細結構之滲透率，同時以燒結式毛細結構提升溝槽式毛細結構之毛細力。首先經由理論分析燒結式毛細結構與溝槽式毛細結構的特性，包含毛細半徑、孔隙度、滲透率與工質填充量的不同，並依理論結果設計出熱管之製造參數。在完成初步設計後，研擬建立複合式熱管製造與測試設備及製程，最後進行熱管實作與性能測試，製作不同熱管長度，並改變不同燒結長度以探討重力影響下之操作角度對熱傳性能的影響。
在性能測試方面，先比較燒結式與溝槽式毛細結構的性能差異，結果顯示重力對燒結式毛細結構熱管的影響很小，但長度增長時液相壓降愈大，以致最大熱傳量會愈低，而溝槽式毛細結構熱管的毛細力低，20˚以上的傾角即無法傳遞熱能，但其毛細結構之滲透率高，使水平測試下的效能可高出燒結式毛細結構熱管的50%。至於複合式毛細結構熱管之最大熱傳量會依其燒結長度而有所改變，當燒結長度愈短時，其滲透率高而毛細力低，故重力對最大熱傳量影響大，在水平測試下的最大熱傳量可高出燒結式熱管之2倍；當燒結長度愈長時，其滲透率低而毛細力高，水平測試下之最大熱傳量可高出燒結式熱管60%的效能，由本研究之結果可知，利用調整其燒結長度，可在滲透率與毛細力間加強其不足，得到高於單一毛細結構之效能的熱管。

This experimental and fabrication investigation aims to develop and manufacture a high-efficiency composite heat pipe incorporated with the thermal module for the thermal management of advanced computers. The fundamental concept is taking advantage of both the high permeability of grooved wick and the strong capillary force of sintered wick. In this study, the sintered and grooved wicks are combined together to form a composite wick structure in enforcing the maximum heat-transfer capability for this micro heat pipe. At first, an appropriate set of processing parameters are determined from the theoretical analysis on capillary radius, porosity, permeability, and the amount of working mediums for this heat pipe. Then, the manufacture facility, process procedure, and performance test system are set up to perform a parametric study on the influences of sintered-wick length, heat-pipe length, and inclined angle.
To serve as the comparison foundation, the performance differences between the sintered and the grooved wick structures are obtained on this test platform. It is found that gravity has little impact on the sintered heat pipe while a strong downgrade is observed for an increasing heat pipe length. Also, due to the weak capillary force, the grooved wick structure can not function normally at a 20° inclination angle; however, a 50% performance enhancement compared to sintered wick is observed under horizontal position due to the high permeability.
Regarding the composite-wick heat pipe, it is demonstrated that the maximum heat transfer rate varies significantly with the length of sintered wick under both positive and negative inclination angles. Clearly, the shorter the sintered wick is, the higher the permeability and the weaker the capillary force will be. Thus, gravity has significant influences on maximum heat transfer rate, which can be twice as much as that of the sintered heat pipe under level test. In the other end, the longer the sintered wick is, the lower the permeability and the higher the capillary force will be. Nevertheless, the maximum heat transfer rate still can be 60% times as much as that of the sintered heat pipe at the worst case. In summary, the performance of this composite heat pipe is superior to both of the sintered-wick and grooved-wick heat pipe. Moreover, to meet the specified need for different applications, it is possible for engineers to reinforce the permeability or the capillary force to obtain a better heat pipe by adjusting the length of sintered wick

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