複合式微結構對迴路式熱板特性影響之研究

Study on the Performance of loop heat pipe in the Complex Wicks

何啟廷(Chi-Ting Ho)

指導教授 ： 蘇程裕

國立臺北科技大學/機電學院/製造科技研究所/碩士(2008年)

摘要

迴路式熱管為一種利用兩相變化熱傳的散熱元件，其相對於傳統熱管更具有高熱傳量、傳輸距離長與低熱阻的表現，在目前電子產業的應用上有極大的發展空間。平板型迴路式熱管不同於一般蒸發區為圓柱型之迴路式熱管，其平板可直接貼於熱源上，免除圓柱型蒸發區需額外加裝一鞍座而增加系統熱阻之缺點，於應用上更加廣泛。
本研究中使用兩種不同粒徑之銅粉粉末（150網目、400網目），以刮刀成型法方式製成粗坏並燒結，製成迴路式熱板之複合毛細微結構。在第一微結構部份以400網目粉末燒結使其具有較大的毛細力，第二微結構（150網目）則有良好的滲透率，利用刮刀成型後之粗坏可進行單次直接燒結於平板型迴路式熱管下蓋，降低製程中之誤差。實驗中分別注水7.4g、9.5g及10.3g並量測其性能，結果顯示雖然7.4g之注水量於60W時有1.25℃/W的最低熱阻，但是在低瓦數啟動狀況下9.5g注水量系統卻有較為穩定之表現。

關鍵字

平板型迴路式熱管 ； 毛細結構 ； 燒結

並列摘要

Loop heat pipe is a heat transfer element which using heat transfer with two-phase changes. Its thermal conductivity, transfer distance, and heat resistance is better than traditional heat pipes. Loop heat pipe has a lot of development potential in the field of electronic industry. The loop heat pipe with flat evaporator is difference with cylinder one. The flat evaporator type can be place on the heat source directly without using saddle and increasing heat resistance.
In this research, we use two kind of copper powder 150 mesh and 400 mesh. The complex wick structure of loop heat pipe can be manufactured to green tape with stinter process by using doctor blade casting. In primary structure, we may stinter 400 mesh powder to have more capillarity. In secondary structure, the stinter of 150 mesh powder has well permeability. The green tape make by doctor blade casting can be stinter to chamber of loop heat pipe with flat evaporator type for single time. This technique can decrease the error during manufacture. In the experiment, we inject water 7.4g, 9.5g, and 10.3g respectively to measure the performance. The result shows the 7.5g water in 60W has lowest heat resistance 1.25℃/W. Furthermore, injection of 9.5g water is more stable in low watts start condition.

並列關鍵字

Loop Heat Pipe ； Wick Structure ； Sinter

參考文獻

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