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Titolo:
Interactions of longitudinal vortices generated by twin inclined jets and enhancement of impingement heat transfer
Autore:
Nakabe, K; Fornalik, E; Eschenbacher, JF; Yamamoto, Y; Ohta, T; Suzuki, K;
Indirizzi:
Kyoto Univ, Dept Mech Engn, Kyoto 6068501, Japan Kyoto Univ Kyoto Japan 6068501 niv, Dept Mech Engn, Kyoto 6068501, Japan Stanislaw Staszic Univ Min & Met, PL-30059 Krakow, Poland Stanislaw Staszic Univ Min & Met Krakow Poland PL-30059 9 Krakow, Poland
Titolo Testata:
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
fascicolo: 3, volume: 22, anno: 2001,
pagine: 287 - 292
SICI:
0142-727X(200106)22:3<287:IOLVGB>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
CIRCULAR JET; CROSS FLOW;
Keywords:
jet impingement heat transfer; crossflow; twin jet interaction; heat transfer coefficient; longitudinal vortex; flow visualization; PIV system;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Nakabe, K Kyoto Univ, Dept Mech Engn, Kyoto 6068501, Japan Kyoto Univ Kyoto Japan 6068501 Mech Engn, Kyoto 6068501, Japan
Citazione:
K. Nakabe et al., "Interactions of longitudinal vortices generated by twin inclined jets and enhancement of impingement heat transfer", INT J HEA F, 22(3), 2001, pp. 287-292

Abstract

The present study was provided to examine the interaction between two inclined impinging jets in in-line and staggered arrangements with crossflow. The experimental investigations on impingement heat transfer characteristicsand Row structures were made using thermochromic liquid crystal, fluorescence dyes and particle image velocimetry, PIV, techniques. Color patterns ofthe liquid crystal images taken with a CCD video camera were transformed into target wall temperature distributions and then into Nusselt number distributions by means of neural network algorithm. The how patterns were visualized by using fluorescent dye injected into the jets and illuminated by a planer CW laser light. The cross-sectional images of a planer pulse laser light scattered by fine tracer particles were estimated with the PIV system and presented as the velocity distributions. It was observed that the geometrical arrangement of the inclined jets had an influence on the interactionbetween the two jet flows, on the vortical structures generated in the downstream of the jets, and eventually on the enhanced regions of jet impingement heat transfer. The large-scale four longitudinal vortices were generated in the case of staggered arrangement of the two inclined jets, while in the case of in-line arrangement only three major vortices were observed. (C)2001 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 08:44:30