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Dellinger G.,National Institute for Applied Sciences, Strasbourg | Garambois P.-A.,National Institute for Applied Sciences, Strasbourg | Dufresne M.,Laboratoire Des Science Of Lingenieur | Terfous A.,National Institute for Applied Sciences, Strasbourg | And 2 more authors.
IOP Conference Series: Earth and Environmental Science | Year: 2016

Finding new, safe and renewable energy is becoming more and more of a priority with global warming. One solution that is gaining popularity is the Archimedean Screw Generator (ASG). This kind of hydroelectric plant allows transforming potential energy of a fluid into mechanical energy and is convenient for low-head hydraulic sites. As it is a new and growing technology, there are few references dealing with their design and performance optimization. The present contribution proposes to investigate experimentally and numerically the ASG performances. The experimental study is performed for various flow conditions and a laboratory scale screw device installed at the fluid mechanics laboratory of the INSA of Strasbourg. The first results show that the screw efficiencies are higher than 80% for various hydraulic conditions. In order to study the structure of 3D turbulent flows and energy losses in a screw, the 3D Navier Stokes equations are solved with the k-w SST turbulence model. The exact geometry of the laboratory-scale screw was used in these simulations. Interestingly, the modeled values of efficiency are in fairly good agreement with experimental results while any friction coefficient is involved.

Madec M.,Laboratoire Des Science Of Lingenieur | Haiech J.,Laboratoire Des Science Of Lingenieur | Rosati E.,Laboratoire Des Science Of Lingenieur | Rezgui A.,Laboratoire Des Science Of Lingenieur | And 2 more authors.
Medecine/Sciences | Year: 2017

Synthetic biology is an emerging science that aims to create new biological functions that do not exist in nature, based on the knowledge acquired in life science over the last century. Since the beginning of this century, several projects in synthetic biology have emerged. The complexity of the developed artificial bio-functions is relatively low so that empirical design methods could be used for the design process. Nevertheless, with the increasing complexity of biological circuits, this is no longer the case and a large number of computer aided design softwares have been developed in the past few years. These tools include languages for the behavioral description and the mathematical modelling of biological systems, simulators at different levels of abstraction, libraries of biological devices and circuit design automation algorithms. All of these tools already exist in other fields of engineering sciences, particularly in microelectronics. This is the approach that is put forward in this paper. © 2017 médecine/sciences-Inserm.

Dufresne M.,British Petroleum | Dufresne M.,Laboratoire Des Science Of Lingenieur | Vazquez J.,British Petroleum | Vazquez J.,Laboratoire Des Science Of Lingenieur | And 4 more authors.
Houille Blanche | Year: 2014

This paper proposes three methodologies for the determination of discharge using water depth and velocity measurements when international standards are not applicable. Each methodology is illustrated through the use of a practical application. The first methodology deals with the instrumentation of the overflow discharge of a combined sewer overflow chamber. Even if these works are hydraulically very similar to standard weirs, their geometry is generally very complex and sometimes unique. The proposed methodology consists in a hydraulic analysis, the use of 3D computational fluid dynamics and the analysis of the simulated results in order to build simple head-discharge relationships that can be easily used by sewer managers. The second methodology deals with ultrasonic (transit-time) gauging stations where singularities have a significant influence on the link between the measured velocities and the mean velocity. The methodology for such stations is very similar to the previous one, with the exception that the models have to be chosen for simulating the velocity distribution and not only the water level distribution. Finally, the third method deals with the determination of the discharge in a sewer using two water level measurements located in two distant manholes. The methodology here consists in a hydraulic analysis, the use of the backwater curve equation (1D model) and an analysis of the simulated results to build an exploitable relationship. © 2014 Société Hydrotechnique de France .

Parida D.,CNRS The Institute of Chemistry and Processes for Energy, Environment and Health | Serra C.A.,CNRS The Institute of Chemistry and Processes for Energy, Environment and Health | Garg D.K.,Laboratoire Des Science Of Lingenieur | Hoarau Y.,Laboratoire Des Science Of Lingenieur | And 2 more authors.
Macromolecular Reaction Engineering | Year: 2014

Continuous-flow atom transfer radical polymerization of 2-(dimethylamino)ethyl methacrylate in tubular microreactors of different diameters and geometries is studied. Scale-up of tubular reactors from micro (876μm ID) to milliscales (1753 and 4083μm IDs) is investigated. Coil flow inverter (CFI) reactors having 3 and 6m length (three and seven bends, respectively) are also considered for this study. Positive effects of flow inversion are visible in all three types of reactors expressed by an increase in molecular weight and monomer conversion as well as a decrease in the PDI for the same operating parameters. An increase in reactor diameter results in an increase in the throughput. It is worthy to mention that a CFI reactor having 4083μm ID and 3m (three bends) is found to increase the throughput by ten times without significantly increasing the PDI compared to a coiled tube microreactor with 876μm ID, 6m and no flow inversion pattern. However, pressure drops are higher (+0.1 bar) in case of larger diameter tubes. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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