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MODELLING OF HYDRODYNAMIC AND THERMAL BEHAVIOURS IN IMPINGING TWIN-JETS

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.1150
pages 1527-1540

Fatiha Bentarzi
Theoretical and applied laboratory of fluid mechanics, University of science and Technology of Algiers USTHB, B.P: 32 Al Alia - BabEzzouar -16111- Algiers, Algeria

Mourad Rebay
University of Reims Champagne-Ardenne GRESPI / Faculte des Sciences PB 1039, 51687 Reims, France

Amina Mataoui
Laboratoire de Mécanique des Fluides Théorique et Appliquée - Faculté de Physique Université des Sciences et de la Technologie Houari Boumediene

Resumo

This study presents the numerical predictions of the fluid flow and the heat transfer characteristics for impingement of twin turbulent jets on a solid heated plate located before the merging point of the jets. The study is relevant to a wide range of practical applications including manufacturing, material processing, electronic cooling, drying paper or textile, tempering of glass, etc.... A turbulent control volume method solves the governing equations based finite-difference method with power-law scheme. The well known second order RSM model and its associated wall function have been used for the description of the turbulent behaviour. The velocity and pressure terms of momentum equations are solved by the SIMPLE method. In this study non uniform collocated grids are managed. The possibility of improving the heat transfer is carried out according to the characteristic parameters of the interaction jet-wall. A parametrical study has been conducted including the jet Reynolds number (Re) and the ratio of the distance nozzle-plate to the nozzle width (D/w). The separating distance between the two jets is fixed to 20 nozzle height. Good agreement with previous experimental studies of multi-jets has been observed. The results show the presence of a complex scarf vortex formed around each impinging jet, and a fountain upwash flow resulting from the interaction of the wall jet. The influence of (D/w) on the Nusselt number have shown to be very significant. The Nusselt number evolution presents a main peak in the impact location, and can have supplementary peaks, due to the secondary eddies, in the case where the plate is located in the merging region of the jets.

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