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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NOURI, Hussain; RAVELET, Florent; BAKIR, Farid; SARRAF, Christophe; REY, Robert (ASME, 2012)An experimental study on the design of counter-rotating axial-flow fans was carried out. The fans were designed using an inverse method. In particular, the system is designed to have a pure axial discharge flow. The ...
Etude numérique des gains de performances et de capacité d'aspiration apportés par un étage axial contra-rotatif par rapport à une pompe mono-rotor. DANLOS, Amélie; RAVELET, Florent; SOLIS, Moises; BAKIR, Farid (2013)This study deals with the development of an efficient method of design for subsonic conter-rotating axial flow turbomachineries. From specifications of a reference axial pump with only one rotor, two configurations of ...
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 ...
TOMOV, Petar; DANLOS, Amélie; KHELLADI, Sofiane; RAVELET, Florent; SARRAF, Christophe; BAKIR, Farid (IOP sciences conference series, 2015)The fact of injecting bubbles into a cavitating flow influences typical cavitating behavior. Cavitation and aerated cavitation experiments has been carried out on a symmetrical venturi nozzle with convergent/divergent ...
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 ...