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  • 學位論文

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

Generation of High Concentration Aerosol Particles with Controllable Size Distribution and Effects of Size Distribution on the Loading Characteristic

指導教授 : 陳志傑

摘要


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

並列摘要


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

並列關鍵字

Loading Aerosol Generator

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.
第一篇
參考文獻

被引用紀錄


詹朝竣(2010)。以海綿為衝擊介質呼吸性粉塵分徑採樣器之佳化研究〔碩士論文,國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342%2fNTU.2010.00805

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