Flowing afterglow system for surface treatment of heat sensitive small diameter tubes

Kutasi, Kinga (2016) Flowing afterglow system for surface treatment of heat sensitive small diameter tubes. Plasma Sources Science and Technology. pp. 1-23. ISSN 0963-0252 ; ESSN: 1361-6595 (Submitted)

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Abstract

The flowing afterglow of an N2-O2 surface-wave microwave discharge is used to demonstrate the possibility of treating simultaneously the inner and outer surfaces of heat sensitive small diameter tubes in low pressure afterglows. It is shown that the afterglow can be efficiently guided through a 4.5 mm polymer tube, as well as similar afterglows can flow simultaneously inside and around the tube at gas flow rates in the range of 500-1000 sccm. A 5 mm inner diameter quartz tube is used to study the afterglow guided through small diameter tubes, by following the evolution of the UV emission originating from the excited NO molecules created in the three-body re- association process of N and O-atoms. The afterglows in the reactor and in the quartz tube are characterized using a 3-D hydrodynamic model. According to the calculated density distributions the relative density of atoms do not change considerably along the tube placed into reactor. The calculated gas temperature distribution in the reactor shows that the position of the heat sensitive tube in the reactor should be carefully chosen, e.g. in the second half of a 4.4 cm diameter and 40 cm long reactor.

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