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Experimental study on the effects of big particles physical characteristics on the hydraulic transport inside a horizontal pipe

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Chinese Journal of Chemical Engineering 2016年第2期24卷 317-322页

作者： Salah Zouaoui Hassane Djebouri Kamal Mohammedi sofiane khelladi Aomar Ait Aidelr LMSE Laboratory Mouloud Mammeri University of Tizi-OuzouP.O.Box 17 RPI 5000Algeria LEMI Laboratory MESO M'Hamed Bougara University of Boumerdes35000Algeria DynFluid Laboratory Arts et Metiers Paris Tech151 boulevard de PHOpital75013 ParisFrance

This paper presents an experimental study of the physical characteristic effects of large particles on hydraulic transport in a horizontal *** particles are spherical and are large with respect to the diameter of the pipe(8%,10%,16% and 25%).Experiments were done to test the important parameters in solid transport(pressure,velocity,etc.).As a result,the relationship between the pressure gradient forces and the mixture velocity was substantially different from the pure liquid ***,in a single-phase flow a monotonous behavior of the pressure drop curve is observed,and the curve of the solid particle flow attains its minimum at the critical *** regimes are characterized with differential pressure measurements and visualizations.

关键词： Solid transport Two-phase flow Hydraulic gradient Flow regime

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Tonal Noise Prediction of an Automotive Engine Cooling Fan： Comparison between Analytical Models and Acoustic Analogy Results

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Journal of Mechanics Engineering and Automation 2012年第7期2卷 455-463页

作者： Elias Tannoury sofiane khelladi Bruno Demory Manuel Henner Farid Bakir Valeo Thermal Systems La Verriere 78321 France Laboratoire de Dynamique des Fluides Arts et Metiers ParisTech Paris 75013 France

Valeo, involved in engine cooling fan system design for many years, is interested in noise prediction tools for axial fans. Thus, this paper describes a two-part study of tonal noise computation. The first part deals with the prediction of tonal noise using analytical models. As for the second part, it describes a hybrid approach for predicting tonal noise where the sources are extracted from an Unsteady Reynolds-Averaged Naviers-Stocks （URANS） simulation and then propagated into the far, free field using the Ffowcs Williams and Hawkings＇ acoustic analogy. The computational domain is meshed with 46 million polyhedral elements and the simulation takes into account the exact geometry of the rotor blades, the stator blades and the shroud. The results from the first part show that analytical models can be used for comparisons between different fan geometries, but are unable to provide accurate noise predictions compared to experimental results. The simulation shows non-periodic blade loading over a whole fan revolution, and different blade loading between the blades. This introduces some bias in the assessment of the acoustic performance of the fan. Overall, the results from the hybrid method are in accordance with the experimental results.

关键词： Aeroacoustics axial fan tonal noise.

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