https://scholars.lib.ntu.edu.tw/handle/123456789/110981
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor | 陳志傑 | en |
dc.contributor | 臺灣大學:職業醫學與工業衛生研究所 | zh_TW |
dc.contributor.author | 張光男 | zh |
dc.contributor.author | Chang, Kuang-Nan | en |
dc.creator | 張光男 | zh |
dc.creator | Chang, Kuang-Nan | en |
dc.date | 2004 | en |
dc.date.accessioned | 2007-11-28T03:46:50Z | - |
dc.date.accessioned | 2018-06-29T17:23:12Z | - |
dc.date.available | 2007-11-28T03:46:50Z | - |
dc.date.available | 2018-06-29T17:23:12Z | - |
dc.date.issued | 2004 | - |
dc.identifier | zh-TW | en |
dc.identifier.uri | http://ntur.lib.ntu.edu.tw//handle/246246/59875 | - |
dc.description.abstract | 第一篇 中文摘要 粒徑分佈對於濾材的過濾及負載或是光學特性的研究上是一個很重要的參數,目前雖然有釵h的氣膠產生器已被發展來產生各種不同粒徑分佈的氣懸微粒,但這些產生器大部份都只能被用來產生中位粒徑不同但幾何標準偏差大致相同的氣懸微粒,沒有可以用來改變幾何標準偏差的產生器。在過去雖然有研究指出可產生中位粒徑相同但幾何標準偏差不同的微粒,其結果產生微粒的濃度並不高,且粒徑分佈只侷限於微米微粒,若要用在濾材的負載測試的研究並不合適。因此本實驗的目的將要建立一套高濃度且分佈包含微米微粒與次微米微粒範圍的可控制粒徑微粒產生系統。 在本研究中藉由改造蒸發凝結式單一粒徑微粒產生器 (Condensation Monodisperse Aerosol Generator, Model 3457, TSI Ins., St. Paul, MN, U.S.A) ,來產生可控制粒徑大小與分佈的微粒,此儀器主要的原理為利用凝結核與飽和高溫蒸氣混合,再讓蒸氣與凝結核通過冷凝管使蒸氣凝結在核上形成氣懸微粒。實驗中將產生固態的石蠟 (Paraffin) 微粒,控制粒徑分佈的方法則是增加一道外加氣流帶出石蠟蒸氣與凝結和混合,而氣流的大小則是由質流量控制閥控制,藉由短時間內改變不同的流量來控制粒徑分佈。 實驗結果顯示在石蠟溫度200℃、霧化壓力1Bar及Screen Flow 1 L/min的條件下,藉由調整石蠟的蒸氣量 (0.05-1.1 lpm),可產生粒徑0.3-3 | zh_TW |
dc.description.abstract | A variety of aerosol generators have been developed to produce aerosols with different size distribution. Most of these aerosol generators can only be modified to produce aerosols of different count median diameter (CMD) with about the same geometric standard deviation (GSD). Although an ultrasonic atomizing nozzle had been modified to become a universal size-distribution aerosol generator, the aerosol number concentration was too low for some applications, such as aerosol loading tests. Therefore, the main purpose of the present study was to develop a high concentration aerosol generator which is capable of generating various size distributions. In this study, a condensation monodisperse aerosol generator (Model 3475, TSI Incorporated, St. Paul, MN) was chosen as the core of the aerosol generating system, and the paraffin was used as the test agent. By using electromagnetic valves controlled by a computer, we were able to manipulate the air flows through saturator and filter units, to control the amount of vapors and the number of nuclei, respectively. By changing the cycle time of different combination of air flows, a universal size-distribution aerosol generator was made possible, including a fixed CMD with changeable GSD. For example, monodisperse aerosols with size ranging from 0.3 to 3 | en |
dc.description.tableofcontents | 第一篇 目錄 目錄 Ⅰ 圖目錄 Ⅱ 中文摘 Ⅲ Abstract Ⅳ 一、 研究緣起與目的 1 二、 文獻探討 2 三、 研究方法 9 3-1 氣懸微粒的產生 9 3-2 氣懸微粒的量測 10 3-3 實驗儀器 10 四、 結果與討論 13 五、 結論與建議 16 參考文獻 17 圖目錄 Figure 1. The idea of combining monodisperse aerosols to generate a polydisperse aerosols 18 Figure 2. Schematic diagram of the modified TSI 3457 condensation monodisperse aerosol generator 19 Figure 3. Schematic diagram of the experimental setup. 20 Figure 4. Effect of atomizing pressure on the size distribution and concentration of NaCl aerosols 21 Figure 5. Effect of screen flow rate on the nuclei number concentrations 22 Figure 6. Size distribution of paraffin aerosols at different screen flow rates 23 . Figure 7. Size distribution of paraffin particles at different saturator temperature conditions 24 Figure 8. Effect of bypass flow rate on the size distribution of paraffin aerosols 25 Figure 9. Effect of external flow rates through the saturator on the particle size distribution of paraffin aerosols 26 Figure 10. The maximum and minimum size distributions of monodisperse paraffin aerosols generated by the modified condensation monodisperse aerosol generator 27 Figure 11. Aerosols with fixed CMD but different GSD 28 . Figure 12. Bi-mode aerosol distribution 29 Figure 13. Triangular aerosol distributions 30 Figure 14. The near uniform size distribution 31 第二篇 目錄 目錄 I 圖目錄 Ⅱ 中文摘要 Ⅳ 六、 研究緣起與目的 1 七、 文獻探討 2 八、 研究方法 12 3-1 氣懸微粒的貫穿實驗 12 3-1-1 氣懸微粒的產生與量測系統 12 3-2 氣懸微粒的負載測試 12 3-2-1 改變海綿填充密度的方式 12 3-2-2 氣懸微粒的產生與量測 13 3-3 實驗儀器 15 九、 結果與討論 20 4-1海綿的過濾特性 20 4-2微粒的負載特性 20 十、 結論與建議 23 參考文獻 24 圖目錄 圖1. 海綿過濾測試系統圖 27 圖2. 舊式握持器與改良式握持器比較圖 28 圖3. 海綿負載測試系統圖 29 圖4. 不同孔隙度下海綿的穿透率 30 圖5. 不同充填密度下海綿的穿透率 31 圖6. 不同表面風速下海綿的穿透率 32 圖7. 有無蜂巢板對粉餅外觀的比較 33 圖8. 有無蜂巢板對微粒負載與壓降之關係 34 圖9. 不同材質微粒與不同濾材間所形成粉餅的關係 35 圖10. 不同孔隙度海綿對4.5mm石蠟微粒的負載特性 36 圖11. 不同充填密度海綿對4.5mm石蠟微粒的負載特性 37 圖12. 相同CMD不同GSD微粒分佈的負載下微粒重量與壓降關係 38 圖13. 相同CMD不同GSD微粒分佈的負載下微粒總表面積與壓降之關係 39 圖14. 單一粒徑壓克力粉末負載下微粒重量與壓降關係 40 圖15. 單一粒徑壓克力粉末負載下微粒總表面積與壓降關係 41 | zh_TW |
dc.language | zh-TW | en |
dc.language.iso | en_US | - |
dc.subject | 微粒產生器 | en |
dc.subject | 微粒負載 | en |
dc.subject | Loading | en |
dc.subject | Aerosol Generator | en |
dc.title | 可控制粒徑分佈之氣懸微粒產生器與粒徑分佈對微粒負載特性的影響 | zh |
dc.title | Generation of High Concentration Aerosol Particles with Controllable Size Distribution and Effects of Size Distribution on the Loading Characteristic | en |
dc.type | thesis | en |
dc.relation.reference | 第一篇 參考文獻 Almann, J., Peter, C. (1992) The Adjustment of the Particle Size at a Sinclair-La Mer-Type Aerosol Generator. J. Aerosol Sci., Vol. 23, Supp. 1, pp. S249-261. De la Mora, J. F., Loscertales, I. G. (1994) The Current Emitted by Highly Conducting Taylor Cones. J. Fluid Mechanics., 260, pp 155-184. Hinds, W. C. (1999) Aerosol Technology. John Wiley & Sons, Inc. pp. 428-226. Japuntich, D. A., Stenhouse, J. I. T., Liu, B. Y. H., (1992) An Aerosol Generator for High Concentrations of 0.5-5 | zh_TW |
item.fulltext | no fulltext | - |
item.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_46ec | - |
item.grantfulltext | none | - |
item.openairetype | thesis | - |
item.languageiso639-1 | en_US | - |
顯示於: | 環境與職業健康科學研究所 |
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