Etude expé́rimentale du transport hydraulique de grandes particules en conduite horizontale et en forme de S
TypeCommunications avec actes
We study the pressure drop and flow regimes for large spheres with respect to the diameter of the pipe (5, 10 and 15%) by differential pressure measurements and visualizations. Two densities are used. The losses are smaller for large grain sizes, and density has a strong effect on the transition point between regimes with a stationary bed flow and dispersed flows. Models based on the Froude number are tested. Finally, we study mixtures of size and / or density. We are also interested in plugging and unplugging transients.
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Influence of design parameters on the global performances of low-speed counter-rotating axial-flow fans WANG, Juan; RAVELET, Florent; BAKIR, Farid (2014)The present work aims at experimentally investigating the effects of some parameters on the performances of a counter-rotating stage, and on the instationary flow between the rotors. Three counter-rotating fans, which have ...
Experimental study of blade rigidity effects on the global and the local performances of a thick blades axial-flow fan NOURI, Hussain; RAVELET, Florent; SARRAF, Christophe; BAKIR, Farid (ASME, 2010)An experimental investigation on the aerodynamic performances of thick blades axial-flow fans was carried out in this study. Two fans are considered, the first one is rotomoulded (in plastic) and the second one is milled ...
Experimental study of blade thickness effects on the overall and local performances of a Controlled Vortex Designed axial-ﬂow fan SARRAF, Christophe; NOURI, Hussain; RAVELET, Florent; BAKIR, Farid (Elsevier, 2011)The purpose of this work is to study the effects of blade thickness on the performances of an axial-ﬂow fan. Two fans that differ only in the thickness of their blades were studied. The ﬁrst fan was designed to be part of ...
Performance gains provided by the use of a counter-rotating axial-flow fan with respect to a conventional rotor-stator stage WANG, Juan; RAVELET, Florent; BAKIR, Farid (Ethan publishing, 2015)The adoption of counter-rotating stages for propellers, axial-flow pumps and low-speed fans has opened a way to design high performance and compact turbomachines in various industrial domains, leading to potentially high ...
RAVELET, Florent; BAKIR, Farid; KHELLADI, Sofiane; REY, Robert (Elsevier, 2013)This article presents an experimental study of the hydraulic transport of very large solid particles (above 5 mm) in an horizontal pipe. Two specific masses are used for the solids. The solids are spheres that are large ...