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Mass transfer to local electrodes at wall and wall friction factor in decaying turbulent swirl flow

✍ Scribed by S. Yapici; G. Yazici; C. Özmetin; H. Ersahan; Ö. Çomakli

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
635 KB
Volume
40
Category
Article
ISSN
0017-9310

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✦ Synopsis

This paper describes an investigation of mass transfer to local electrodes at the wall and wall friction factor behaviour in decaying swirl flow in a circular duct generated by short helical swirl generators. Five swirl generators with angles between 15-70 ° to duct axis were employed. The experiments were carried out in a Reynolds number range 8900-27 000 and at a Schmidt number of 1692. The axial distribution of the mass transfer to a circular electrode at the wall were measured using an electrochemical technique and the friction factors at the wall were calculated. Flow visualization experiments showed that no circulation nor dead zone occurs in the system. The local mass transfer data were correlated in the form of Sh, = 0.0490 Re o 8L7 (1 + tan 00) °5°~ Sc v3, for the whole range of swirl generator angles and the following correlations were developed f = 0.2517 RG-o 263 (1 + tan Oo) ° 88o and f = 39.810 Rex 0.642 (1 + tan 00) ° 746 for local friction factor for swirlers of 15-45 ° and 60 and 70, respectively.

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