ARTICLE:

• THERMAL EVALUATION OF JET-TO-PLATE SPACING EFFECTS IN LAMINAR CONFINED MULTIJETS  download article

R. Mehryar
Institut de Mécanique des Fluides de Toulouse, Toulouse, France

Andre Giovannini
Institut de Mecanique des Fluides de Toulouse, UMR 5502, Universite Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex, France

ABSTRACT

In this study, an experimental simulation is made to investigate the cooling performances of a confined multi-jets arrangement. Nine jets in square in-line arrays are considered. The jet diameter is 3 mm. The jet-to-jet spacing ratio equals to 2 times of the jet diameter and the jet-to-plate spacing changes from 1 to 4 times of the jet diameter. The jet Reynolds number varies from 100 to 1000. It is utilized an infrared camera for temperature measurement on the impingement plate and a system of PIV camera and laser for the velocity field measurement. The results show a nonsymmetric heat transfer effect on the impingement foil for H/d = 2 where the jet interactions behaviour is similar to H/d = 1 for the neighbour jets and similar to H/d = 3 between the diagonal neighbour jets. For H/d = 1 the cooling effect of the side jet increases compared to that of the central jet at high Reynolds number, but for H/d = 3, the maximum heat transfer coefficient is lowered considerably for the side jet.

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