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Titolo:
MASS-TRANSFER TO LOCAL ELECTRODES AT WALL AND WALL FRICTION FACTOR INDECAYING TURBULENT SWIRL FLOW
Autore:
YAPICI S; YAZICI G; OZMETIN C; ERSAHAN H; COMAKLI O;
Indirizzi:
ATATURK UNIV,FAC ENGN,DEPT CHEM ENGN TR-25240 ERZURUM TURKEY ATATURK UNIV,FAC ENGN,DEPT MECH ENGN TR-25240 ERZURUM TURKEY
Titolo Testata:
International journal of heat and mass transfer
fascicolo: 12, volume: 40, anno: 1997,
pagine: 2775 - 2783
SICI:
0017-9310(1997)40:12<2775:MTLEAW>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEAT-TRANSFER; TRANSFER ENHANCEMENT; TUBE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
S. Yapici et al., "MASS-TRANSFER TO LOCAL ELECTRODES AT WALL AND WALL FRICTION FACTOR INDECAYING TURBULENT SWIRL FLOW", International journal of heat and mass transfer, 40(12), 1997, pp. 2775-2783

Abstract

This paper describes an investigation of mass transfer to local electrodes at the wall and wall friction factor behaviour in decaying swirlflow in a circular duct generated by short helical swirl generators. Five swirl generators with angles between 15-70 degrees 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(x) = 0.0490 Re-x(0.817) (1 + tan theta(0))(0.508) Sc-1/3 for the whole range of swirl generator angles and the following correlations were developed f = 0.2517 Re-x(-0.263) (1 + tan theta(0))(0.880) and f = 39.810 Re-x(-0.642) (1 + tan theta(0))(0.746) for local friction factor for swirlers of 15-45 degrees and 60 and 70 degrees, respectively. (C) 1997 Elsevier Science Ltd.

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Documento generato il 15/07/20 alle ore 07:20:04