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NUMERICAL SIMULATION OF TWO HEATED PARALLEL PLANE AIR JETS

DOI: 10.1615/ICHMT.2008.CHT.1480
14 pages

Bentarzi Fatiha
Laboratoire de Mécanique des Fluides Théorique et Appliquée - Faculté de Physique -Université des sciences et de la technologie Houari Boumediene (USTHB), B.P. 32, Bab Ezzouar, 16111 Al Alia, Alger, Algérie

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

Terfous Abdelali
Laboratoire de Génie de la Conception, INSA de STRASBOURG, 24, Boulevard de la Victoire - F-67084 - STRASBOURG - France

Abstract

Two parallel plane air jets have several features such as the existence of a sub-atmospheric pressure region and the formation of a flow recirculation zone adjacent to the nozzle plate. In particular, the symmetry plane that exists between two parallel plane jets may appear to affect the flow field in much the same way as a solid wall does in a reattaching offset jet. However, it is obvious that there are significant differences far downstream from the nozzles because the two parallel plane jets will combine to form a single free jet while the offset jet will develop into a wall jet. These results indicate that the wall exerts significant retarding and turbulence suppression effects on the offset jet in the flow development region. By comparisons, the interaction of two inner shear layers on both sides of the symmetry plane in two parallel plane jets results in a much more turbulent near field than that of the offset jet.
The study aims to obtain a better understanding of the gas jet used for enhancing heat transfer between a fluid and a surface. Such configuration is widely encountered in many industrial processes. Steady-state simulations were performed and the flow was considered incompressible and turbulent. The flow field has been predicted numerically using RANS turbulence modelling. The mean flow and turbulence transport equations are solved using finite volume method. The pressure-velocity coupling is solved using the well-known PISO algorithm The pre-processor, Gambit, was used to generate the required grid for the CFD package FLUENT 6.3 to solve the two dimensional Navier-Stokes equations numerically for the jet Reynolds number ranging from 11000 to 20 000 . The influence of the distance between the two jets is also examined.
Several computing data are compared with previous experimental investigation. Recirculating zones are characterized by a negative pressure. High Reynolds number models are not adapted for the prediction of the near wall region which probably has great important influences, but in our case the recirculating zones which are governed by pressure effects can explain the validation of this kind of models.

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