https://scholars.lib.ntu.edu.tw/handle/123456789/80889
標題: | 小型熱聲冷凍機製造及研究(1/3) | 作者: | 胡文聰 | 公開日期: | 31-七月-2003 | 出版社: | 臺北市:國立臺灣大學應用力學研究所 | 摘要: | 本計劃欲分三年執行,總目的為設計、製 造及分析一小型熱聲學冷凍機。“小型”指冷 凍機之特徵長度為公分尺度(第一年)到公釐 (第二年),但將使用MEMS 製程製造關鍵零件 在各年中。第一年將進行系統設計、使用矽製 造stack 關鍵零件、安裝在熱聲冷凍機平台 中、及測試。第二年將專注於熱聲driver 之 設計、製造及測試。第三年將進行熱聲冷凍機 系統整合、製造及測試。 第一年目標在熱聲機中關鍵零件: stack。計劃中將使用矽製造數件MEMS stack 片,並將stack 片疊整齊,stack 片與stack 片 間使用低熱傳導材料隔離。MEMS stack 片之 物理動機在於降低聲波軸向之熱傳導(以空氣 為主,熱傳導係數約0.025W/m-K)並增加聲 波徑向之熱傳導(以矽為主,熱傳導係數約 150W/m-K)。Stack 片疊將安裝在一活塞為 driver (最大300Hz.)之共振器中。矽stack 量 測結果將與陶瓷stack 比較。數值計算及設 計將使用熱聲學程式DeltaE。 This three-year proposal aims at design, fabrication and experimental study of small cooling devices. The term ‘small cooling devices’implies cooling systems whose overall length-scale ranges from centimeter (first year focus) to millimeter (second year focus), but with MEMS fabricated components throughout the course of the three-year project (as an example, see Fig. 8). The first year will focus on the stack, perhaps the key component in a thermoacoustic device, and its performance. The second year will focus on the driver (micro-speaker) and its performance. The focus of the third year would be to integrate results from the first two years. The first year focus is on the design and testing of a new small-scale thermoacoustics refrigerator stack using micro-machined technique. The unique approach is to use several MEMS fabricated silicon wafers with equally spaced gap as the stack. The motivation is based on the physic of suppressing conduction heat transfer (due to the air gap) in the direction of acoustic oscillation while encouraging heat transfer in the normal direction, since thermal conductivity of silicon (150W/m-K) is much higher than that of air (0.025W/m-K). The stack assembly will be mounted adjacent to an oscillating piston (max 300 Hz) as an acoustic source. Results will be compared with a ceramic stack as baseline as well as computation by a linear acoustic code DeltaE. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/21686 | 其他識別: | 912212E002098 | Rights: | 國立臺灣大學應用力學研究所 |
顯示於: | 應用力學研究所 |
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912212E002098.pdf | 205.17 kB | Adobe PDF | 檢視/開啟 |
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