Surface Loss Rate of Ozone in a Cylindrical Tube

In this paper, we describe the loss rate of ozone at the surface of a cylindrical tube. The loss rate of ozone at the surface is varied with the material of the tube. Therefore, tubes made of 6 different materials, borosilicate (Pyrex) glass, quartz, acrylic resin (poly methyl methacrylate, PMMA), c...

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Bibliographic Details
Published in:Ozone : science & engineering 2011-03, Vol.33 (2), p.106-113
Main Authors: Itoh, Haruo, Isegame, Satoru, Miura, Hayato, Suzuki, Susumu, Rusinov, Ilko M.
Format: Article
Language:English
Subjects:
Acrylic resin
Applied sciences
Borosilicate glasses
Decay
Density
Diffusion Coefficient
Effective Lifetime
Exact sciences and technology
Gas pressure
Glass
Loss Rate
Materials selection
Ozone
Pollution
Polymethyl methacrylates
Rate Coefficient
Reflection Coefficient
Stainless Steel
Tubes
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Summary:In this paper, we describe the loss rate of ozone at the surface of a cylindrical tube. The loss rate of ozone at the surface is varied with the material of the tube. Therefore, tubes made of 6 different materials, borosilicate (Pyrex) glass, quartz, acrylic resin (poly methyl methacrylate, PMMA), copper, aluminum and stainless steel are prepared as specimen. The investigations are carried out on the loss rate of ozone in the tube. The temporal decay of ozone density in the tube is observed by the HgI (254 nm) photoabsorption method. Since the density decreased exponentially with time, we determined the time constant for ozone density decay whose inverse represents the effective lifetime of ozone in the tube. The experiments are performed over a wide range of gas pressures from 6.7 to 1333 hPa (5 to 1000 Torr) to investigate the gas pressure dependence of the ozone effective lifetime in the tube. From these results, we determined the loss rate of ozone in the cylindrical tube made of each material. It was found that the loss rate of ozone depends on the wall material and the surface condition of them. The loss rate of ozone in the tube is mainly determined by the loss rate at the surface of the tube. Therefore, we introduce a new parameter named the equivalent diffusion coefficient. It is useful for selecting a suitable material, which utilizes ozone for various purposes, such as the production, preservation and transportation of ozone.
ISSN:0191-9512
1547-6545
DOI:10.1080/01919512.2011.548295