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姓名 鍾享宸(Hsiang-Chen Chung)  查詢紙本館藏   畢業系所 能源工程研究所
論文名稱 反向氣流對微小粉末於儲槽排放行為影響之研究
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摘要(中) 顆粒流動之行為中包含細微顆粒和間隙氣體之間的作用。在儲槽中顆粒的流動相當受到矚目。儲槽內部在間隙氣體之作用下,會使顆粒在流動時產生排放不順暢的現象,並且在顆粒小於200 µm時特別顯著。由於不同粒徑的粉末在儲槽中流動所產生的排放流率和氣泡現象都具有可探討的價值,故本研究旨在探討不同粒徑的粉末於儲槽中流動時所產生的排放流率和氣泡面積大小。本實驗以三種不同粒徑大小(90.5 µm、115.5 µm、165 µm)作為實驗探討之變因,並且以質量流率量測法、氣壓值偵測法、氣泡影像分析法作為實驗中的分析方法。本研究經由實驗測量的結果顯示:使用不同粒徑的顆粒確實是對於顆粒的排放速率有影響,顆粒粒徑較大時,其所產生的排放流率會較佳;顆粒粒徑較小時,其所產生的排放流率會較差,再加上,不同粒徑的顆粒對於空氣所形成的氣泡面積大小也會有影響,較小粒徑的顆粒在儲槽中排放時,其形成的氣泡面積較大;較大粒徑的顆粒在儲槽中排放時,其所形成的氣泡面積較小。此外,本研究也藉由氣壓偵測軟體偵測出儲槽內部氣壓的回升情形。
關鍵詞:儲槽、粒徑、質量流率、氣泡現象
摘要(英) The behavior of the particle flow involves the interaction between the fine particles and the interstitial fluid. From the interaction of the interstitial fluid, the particles may be discharged when the flow is not smooth, and the particles are particularly dominated when the particles are less than 200 μm . Since the discharging flow rates and the bubble phenomenon are worth investigating with different size of the particles in silo, so this research means to investigate the discharging flow rate and the bubble maximal area of the different size of the particles.
Three different size of the powders were used in this research (90.5 μm、115.5 μm、165 μm). In this research, mass flow rate measured method , gauge pressure detected method and the bubble image observed method were used as the experimental analyzed method. Based on the results of this experiment, it can be understood that the powders with different particle size indeed affect the area of the air bubbles also the mass flow rate of the powders .That is to say:the larger powder size is, the higher mass flow rate will be, the larger powder size is, the smaller maximal area of the bubble is ; the smaller powder size is, the lower mass flow rate will be, the smaller powder size is , the larger maximal area of the bubble is.
Furthermore, this research also detects the values of pressure rising in the silo via the pressure detection software.
Keywords: silo、particle size、mass flow rate、bubble phenomenon
關鍵字(中) ★ 儲槽
★ 顆粒粒徑
★ 氣泡面積
關鍵字(英) ★ Silo
★ Particle size
★ Bubble area
論文目次 摘要ⅰ
Abstract ⅱ
目錄 ⅳ
附表目錄 ⅵ
附圖目錄 ⅶ
符號說明 ⅹ

第一章 前言 1
1.1研究背景 1
1.1.1儲槽介紹 1
1.1.2儲槽排放行為介紹 2
1.2文獻回顧 4
1.2.1儲槽開口與排放流率 4
1.2.2間隙氣體與空氣氣泡 7
1.2.3顆粒粒徑與流動性 11
1.3研究動機 13
1.4論文架構 14

第二章 實驗方法 20
2.1實驗設備 20
2.2分析方法 22
2.2.1累積質量及瞬時質量流率量測法 22
2.2.2樣本擾動係數計算法 23
2.2.3孔隙率與滲透率計算法 23
2.2.4平均排放流率計算法 24
2.2.5儲槽內部氣壓量測法 24
2.2.6空氣進入率之計算法 25
2.3實驗流程 25

第三章 實驗結果與討論 32
3.1非開放系統下顆粒排放行為 32
3.1.1累積質量及流動順暢度 32
3.1.2瞬時流率與排放穩定性 34
3.2儲槽氣壓值 36
3.3氣泡現象 38
3.3.1氣泡影像 38
3.3.2氣泡二值化及形心位置 39
3.3.3氣泡面積 40
3.3.4空氣進入率 40
3.3.5儲槽內部氣壓與空氣進入率 41

第四章 結論 67
參考文獻 70
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指導教授 蕭述三(Shu-San Hsiau) 審核日期 2019-12-25
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