https://scholars.lib.ntu.edu.tw/handle/123456789/77130
標題: | 氣膠含水率對散光係數影響之探討(2/2) Research on the Effects of Aerosol Water Content on Scatter ing Coefficient |
作者: | 鄭福田 | 關鍵字: | 氣膠;微粒;含水率;散光;散光係數;Aerosol;Light scattering;Scattering coefficient;Water content | 公開日期: | 31-七月-2002 | 出版社: | 臺北市:國立臺灣大學環境工程學研究所 | 摘要: | 本研究測定氯化鈉、硝酸銨及硫酸銨 等單一及混合成份多粒徑分布之氣膠微粒 群於不同相對濕度下所對應含水率下之散 光係數,並據其濕度條件推算含水率,配 合模式推算結果加以比較。測定結果顯 示:純鹽類及混合鹽類氣膠微粒於不同含 水率之粒徑變化情形,與以往吸濕相關研 究所得者相近且略小,並有隨起始粒徑增 加而增加其成長倍數之情形。純鹽類及混 合鹽類氣膠微粒於不同含水率之散光係數 變化情形,則並未與粒徑般呈一單調遞增 趨勢,主要原因應為不同大小微粒散光效 率為其粒徑之非線性函數。 Utilizing the facilities set up in the previous year, changes of aerosol size distribution and scattering coefficient are measured in the relative humidity-manipulated scenarios to resolve the mechanism of aerosol water content affecting scattering coefficient. The poly-dispersed sodium chloride, ammonium nitrate, and ammonium sulfate particles were prepared as pure-salt test particles. Internally mixed ammonium nitrate and ammonium sulfate particles were also used for test. The size distribution change of test particles can be surveyed by examining particle size change between 30% RH and 90% RH. The results show that the size change gets larger with larger initial particle size. The particle size change values are similar as those reported by other studies. The scattering coefficients corresponding to different RH do not follow the same trend as particle size. The cause should be the non-linearity behavior of scattering efficiency with particle size. The nephelometer readings are systematically higher than the theoretical estimation with a difference of 12% to 34%. The modified theoretical solution considering particles’ evaporation in nephelometer leads to a less difference of 7% to 14%. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/22093 | 其他識別: | 902211E002052 | Rights: | 國立臺灣大學環境工程學研究所 |
顯示於: | 環境工程學研究所 |
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