臺灣博碩士論文加值系統

由於負壓式微幫浦相較於其它驅動方式的微幫浦，具有結構簡單及可驅動任意流體等優勢，因此本研究針對一固定外型之負壓式氣動微幫浦，利用計算流體力學模擬軟體FLUENT作為分析工具，將微幫浦吸入口位置及噴嘴長度做不同的變換搭配，探討微幫浦內部流場情形及不同搭配對於微幫浦能力的影響，找出微幫浦吸取流量的最佳化設計。
本研究的重要結論包括：不論開啟單級或多級的側向吸入口，當微幫浦吸入口的開口位置與噴嘴出口垂直時，吸入口的開口剛好對應於噴嘴出口，則微幫浦有最佳的吸取流量；在各種單級開口中，由於單級平行開口的流體流入方向與噴流同向，流體不會受到過多的擾動或阻力，因而成為本研究最佳的吸入口開啟位置；在開啟多級開口時，則以同時開啟前方及後段吸入口的設計為佳，因為噴流從前方吸入口吸入流體後，噴流流至漸縮流道前端時可再利用牽引作用從後段吸入口吸取流體而增加流量；無論單級開口或多級開口的任何情況，當噴嘴出口伸至漸縮流道後，微幫浦的吸取流體能力便大幅下降。

In comparison to other micropumps with different driving methods, a negative-pressure micropump can drive arbitrary fluids and it has simpler structure. Therefore, a fixed-shape gas-driven micropump of negative- pressure type was used in the present study. The study utilized a CFD code of FLUENT and as the analysis tool to analyze the internal flow fields inside the micropump in which the nozzle length is varied with various openings of suction inlets. In order to obtain the optimal design for pumping flow rates of the micropump, the effects on micropump performance were analyzed by the various combinations of nozzle length and suction inlets.
Major conclusions of the analyses for designing the gas-driven micropump were obtained in the present study. First of all, among the cases of single-opening and multi-opening vertical to the nozzle, the optimal suction flow rates could be obtained when the nozzle outlet location should correspond to the suction inlet opening. For the parallel single-opening cases, there was fewer shear force could disturb the flow due to the same directions of the suction inlet flow and the driving flow. As a result, the parallel cases were the optimal design of suction inlet opening in the present study. For the multi-opening cases, both suction inlet openings in the front of the pump and near the converging section could provide a better micropump flow rate. The reason for that is the suction flow rate is enhanced due to entrainment effects at the opening near the converging section of the micropump. For all of the single-opening and multi-opening cases in the study, the pumping capacity of the micropump significantly deteriorated when the nozzle length extended to the converging section of the micropump.

中文摘要------------------------------------------------ i
英文摘要------------------------------------------------ ii
目錄--------------------------------------------------- iv
圖目錄-------------------------------------------------- vi
表目錄-------------------------------------------------- ix
符號說明-------------------------------------------------x
第一章 導論--------------------------------------------- 1
1.1 研究動機-------------------------------------------- 1
1.2 文獻回顧-------------------------------------------- 2
1.2.1 壓力式微幫浦-------------------------------------- 2
1.2.2 非壓力式微幫浦------------------------------------- 5
1.2.3 氣動式微幫浦--------------------------------------- 7
1.3 研究目的與方法--------------------------------------- 9
第二章 解析理論------------------------------------------ 12
2.1 統御方程式------------------------------------------ 12
2.1.1 連續方程式---------------------------------------- 12
2.1.2 動量方程式---------------------------------------- 14
2.2 紊流理論-------------------------------------------- 18
2.2.1 雷諾應力------------------------------------------ 19
2.2.2 紊流模型------------------------------------------ 21
第三章 數值分析------------------------------------------ 26
3.1 數值模擬方法---------------------------------------- 26
3.1.1 FLUENT模擬軟體------------------------------------ 26
3.1.2 網格的建構---------------------------------------- 27
3.1.3 流場模擬步驟-------------------------------------- 29

3.2 流場幾何尺寸與邊界條件------------------------------- 30
3.2.1 微幫浦基本尺寸及結構變化--------------------------- 30
3.2.2 邊界條件設定-------------------------------------- 33
第四章 結果與討論--------------------------------------- 36
4.1 各單級開口配合各不同噴嘴長度之模擬結果----------------- 36
4.1.1 前段開口F的模擬結果-------------------------------- 36
4.1.2 中段開口M的模擬結果------------------------------- 43
4.1.3 後段開口L的模擬結果-------------------------------- 49
4.1.4 平行開口P的模擬結果-------------------------------- 53
4.2 各多級開口配合各不同噴嘴長度之模擬結果----------------- 57
4.2.1 同時開啟F、M及L開口的模擬結果----------------------- 58
4.2.2 同時開啟P與F開口的模擬結果-------------------------- 61
4.2.3 同時開啟P與M開口的模擬結果-------------------------- 63
4.2.4 同時開啟P與L開口的模擬結果-------------------------- 66
4.3 單級開口與多級開口微幫浦性能的最佳化比較---------------- 68
第五章 結論與建議---------------------------------------- 74
5.1 結論----------------------------------------------- 74
5.2 建議----------------------------------------------- 75
參考文獻------------------------------------------------ 77

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