hyDraulICS IS ThE uSE OF OIl to convert power to a more
useable form and distributing it to where it is needed. It does not
require electrical power and eliminates the risk of electrical shock,
sparks, fire and explosions. This is especially important in the oil
and gas industry. In construction and heavy industries, hydraulics
provides the power and control for the task at hand. It moves heavy
equipment. It lifts, cuts and forms heavy work pieces.
Hydraulic hammers are commonly used in road works. It is
fitted to mechanical excavators and used to
Volume 5, Issue 1 2010 Article 2
Chemical Product and Process
CFD Simulation of Hydraulics of Sieve Trays
with Gas Mal-Distribution
Mahmood Reza Rahimi, Yasouj University
Hajir Karimi, Yasouj University
Rahimi, Mahmood Reza and Karimi, Hajir (2010) "CFD Simulation of Hydraulics of Sieve
Trays with Gas Mal-Distribution," Chemical Product and Process Modeling: Vol. 5: Iss. 1,
CFD Simulation of Hydraulics of Sieve Trays
with Gas Mal-Distribution
Mahmood Reza Rahimi and Hajir Karimi
Next generation surgical instruments powered by hydraulics
Cuntz T., James G., Valkov V., Sanagoo A., Kaltenbacher D.
Fraunhofer PAMB, Mannheim, Germany
Abstract: Procedures in minimal invasive surgery are
continuously developed further while the instrumentation
setup for these operations is still similar to the one used
in the early day of laparoscopy. To meet the exigencies of
these new techniques a new generation of surgical in-
struments actuated with a hydraulic force transmission
was developed. First, it was
FLUID MECHANICS, HYDRAULICS,
HYDROLOGY AND AERODYNAMICS
1. Hunsaker, J. C. and B. G. Rightmire: Engineering Appli-
cations of Fluid Mechanics, McGraw-Hill, 1947, 494 pp.
2. Courant, R. and K. 0. Friedrichs: Supersonic Flow and
Shock Waves, Interscience, 1948, 480 pp.
3. Ferri, A.: Elements of Aerodynamics of Supersonic Flows,
4. Yennard, J. K.: Elementary Fluid Mechanics, Wiley, 1954,
5. Birkhoff, G., K. O. Friedrichs, and T. E. Sterne:
Transactions of the Symposium on Fluid Mechanics and
Computing, Interscience, 1954, 243 pp
The Hydraulics of Musical Desire
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The Expansion Principle
The shaping of time counted among the highest priorities for
seventeenth-century musicians. Of course, temporality always qualifies
as a fundamental dimension of music making. But in the 1600s, com-
posers sought to produce radically new, frequently extravagant experi-
ences of time, alternately expanding and contracting, rushing impetu-
ously forward only to hover in a state of apparent motionlessness. The
arrangement of elements we recognize as
to shift the
locus of regulation from public state engineers to private water meters charg-
ing “rationalized” prices.1 The con sul tants at Castalia insisted that, with these
changes, water would be more efficiently and equitably distributed. This effort
failed spectacularly in 2008 for a variety of reasons, not least because the con-
sul tants were unable to stabilize their mea sures of water during the water audit
(Anand 2017). The reform effort also ran into trou ble when settlers (also called
A Public Matter: Water, Hydraulics, Biopolitics
The paper deals with CFD modelling and simulation of coolant flow within the nuclear reactor VVER 440 fuel assembly. The influence of coolant flow in bypass on the temperature distribution at the outlet of the fuel assembly and pressure drop was investigated. Only steady-state analyses were performed. Boundary conditions are based on operating conditions. ANSYS CFX is chosen as the main CFD software tool, where all analyses are performed.
Results of numerical calculations of heat exchange in a nuclear heating detector for nuclear reactors are presented in this paper. The gamma radiation is generated in nuclear reactor during fission and radiative capture reactions as well as radioactive decay of its products. A single-cell calorimeter has been designed for application in the MARIA research reactor in the National Centre for Nuclear Research (NCBJ) in Świerk near Warsaw, Poland, and can also be used in the Jules Horowitz Reactor (JHR), which is under construction in the research centre in Cadarache, France. It consists of a cylindrical sample, which is surrounded by a gas layer, contained in a cylindrical housing. Additional calculations had to be performed before its insertion into the reactor. Within this analysis, modern computational fluid dynamics (CFD) methods have been used for assessing important parameters, for example, mean surface temperature, mean volume temperature, and maximum sample (calorimeter core) temperature. Results of an experiment performed at a dedicated out-of-pile calibration bench and results of numerical modelling validation are also included in this paper.
The study of flood risk involves the knowledge of the spatial variability in the characteristics of the vegetation cover, terrain, climate and changes induced by the intervention of humans in watersheds. The increased needs of the actors in land management mean that static maps no longer meet the requirements of scientists and decision-makers. Access is needed to the data, methods and tools to produce complex maps in response to the different stages of risk evaluation and response. The availability of very high spatial resolution remote sensing data (VHSR) and digital terrain model (DTM) make it possible to detect objects close to human size and, therefore, is of interest for studying anthropogenic activities. The development of new methods and knowledge using detailed spatial data, coupled with the use of GIS, naturally becomes beneficial to the risks analysis. Indeed, the extraction of information from specific processes, such as vegetation indices, can be used as variables such as water heights, flow velocities, flow rates and submersion to predict the potential consequences of a flood. The functionalities of GIS for cartographic overlay and multi-criteria spatial analysis make it possible to identify the flood zones according to the level of risk from the flood, thus making it a useful decision-making tool.
This study was carried out on the territory of watersheds in the Annaba region, East of Algeria. The choice was guided by the availability of data (satellites images, maps, hydrology, etc.) and hydrological specificities (proximity to an urban area). The adopted model is divided into two parts. The first part is to establish a methodology for the preservation of wetland biodiversity and the protection of urban areas against floods. Thanks to the multi-criteria spatial analysis and the functionalities of the GIS, we established a flood risk map for the watershed defined above. The result was satisfactory compared with the field reality. The second part of the model consisted of the integration of cadastral information with the flood risk map obtained in the first part of our research.
The primary objective of this mapping is to contribute to the development of flood risk management plans (in the sense of risk reduction). The mapping stage also provides quantitative elements to more accurately assess the vulnerability of a territory.
References 1. Yan, Y., Rizwan-uddin, & Kim, K. (2008). A coupled CFD-system code development and application. PHYSOR, Interlaken, Switzerland. 2. Reiss, T., Fehér, S., & Czifrus, S. (2008). Coupled neutronics and thermo hydraulics calculations with burn-up for HPLWRs. Progr. Nucl. Energy, 50, 52-61. 3. Seker, V., Thomas, J. W., & Downar, T. J. (2007). Reactor physics simulations with coupled Monte Carlo calculations and computational fl uid dynamics. In Proceedings of International Conference on Emerging Nuclear Energy Systems (ICENES 2007). 4. Breitkreutz, H