Thermal Science 2012 Volume 16, Issue 1, Pages: 239-250
https://doi.org/10.2298/TSCI101026131B
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Improvement of thermal homogenization using multiple swirling jets
Braikia Mohamed (Université H.B., Chlef, Algérie)
Loukarfi Larbi (Université H.B., Chlef, Algérie)
Khelil Ali (Université H.B., Chlef, Algérie)
Naji Hassan (Laboratoire Génie Civi & géo-Environnement (LGCgE-EA), Université d’Artois/Faculté des Sciences Appliquées, Béthune, France + Université Lille Nord de France, France)
The aim of this study is to examine different blowing configurations of
multiple swirling jets for use it in terminal units of ventilation
applications. The influence of several parameters such as the inclined vanes
of diffuser and the sense of rotation of the single or multiple swirling
jets, their number and their arrangement on the flow resulting dynamically
and thermally is experimentally investigated. Flow rate was adjusted at
Reynolds numbers, Re0, ranging from 104 to 30.103. The current study is
carried out under uniform heat flux condition for each diffuser at Reynolds
number of 30.103, the air being the working fluid. Experiences concerning the
fusion of several jets show that the resulting jet is clearly more
homogenized under swirling influence. The findings of this study show that
the gap between the jets and their sense of rotation relative to the central
jet, affects the quality of the homogenization of ambiance. Among the studied
different configuration, the one which consists of a swirling central jet
controlling the behavior of six swirling jets in counter-rotation is shown to
be the most effective in terms of thermal destratification.
Keywords: multiple free jets, swirling flow, thermal homogenization, vanes swirler, ventilation improvement, air blowing