The Study of Negative Air Ion Produced By Water Droplet Breakup
Date Issued
2004
Date
2004
Author(s)
Yen, Li-Huang
DOI
zh-TW
Abstract
Many investigators have studied the relationships between air ions and the living body, and show that a certain amount of negative air ions (NAI) in inhaled air is necessary for normal vital activity. The concentrations of air ions are dependent on the level of air pollution. Many kinds of air cleaners are used to improve indoor air quality. Recently, the negative air ion cleaners are emphasized without by-products produced. Thus, this kind air cleaner becomes more and more popular for indoor air preventing. There are two types of generating methods: one is by corona discharge, and the other is by droplet breakup. In this work, we would like to use the droplet breakup to generate NAI and also investigate the characteristics of air ions in the environments regarding forest, waterfall and city zones.
There are six sampling places in the forests including five kinds of the woods and one pavilion, which is between waterfall and forest. The results showed that the average NAI concentration of this six places were between 2,800-22,000 ions/cm3. The NAI of five kind woods showed the different concentration, which the NAI concentration of Chinese juniper was the highest. Furthermore, this study also contains four zones in the downtown city. The results showed that the air ions concentration of the downtown city were lower than the forest zones, as well as the air ions concentration of the outdoors were lower than the indoors. The average NAI concentration of the downtown city is in the range of 130-970 ions/cm3 and that of the waterfall zones were between 9,430-44,130 ions/cm3. Comparison of these data, the NAI concentration of the waterfall zones was much higher than that of forest zones and the downtown city.
In this study, we use three kinds of orifice diameter of nozzles and five distances to simulate the mechanism of droplet breakup by atomization in the spray system. The experimental results showed that the maximum and minimum average-NAI concentration were 10,670 ions/cm3 and 830 ions/cm3, respectively. In contrast with single-nozzle, the connection of nozzles were produced much lager amount of NAI. The type of three nozzles connected could produce the highest NAI concentration. The results also indicated that the NAI concentrations produced by the connection of any two nozzles were nearly the same.
Subjects
室內空氣品質
瀑布
噴嘴
空氣負離子
水滴破碎
negative air ion
waterfall
Indoor air quality
droplet breakup
nozzle
SDGs
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-93-R91541122-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):ed04d7d85699dfdea7f3ef072ef09646