kinetic energy Articles
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Development of equilibrium thermodynamic models for studying technical and environmental problems in energy
Mathematical models based on the concepts of classical equilibrium thermodynamics are discussed. The models are intended for comprehensive thermodynamic analysis of various industrial and natural processes. Unlike traditional models, these allow one to view an attainable region of partial equlibria with regard to constraints on kinetics, energy and mass exchange and to determine the thermodynamic ...
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Application of a modified version of RAMS model to simulate the flow and turbulence in the presence of buildings: the MUST COST732 exercise
A modified version of the atmospheric model RAMS6.0 is used to simulate the flow in the MUST experiment, within the framework of the COST732 Action. A standard version of the k-ε turbulence closure model and its renormalisation group version, RNG k-ε, were implemented in the model. Simulations were performed to test the suitability of using the model to reproduce the flow and turbulence in the ...
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A new design of a highly efficient hydraulic turbine on the basis of the specific hydrodynamic effect
Traditional free flow turbines slow down water stream using its kinetic energy. This article describes a method for deriving energy from a free water stream using a unique hydraulic turbine which unlike traditional hydraulic turbines speeds up the water stream using potential energy thanks to a specific hydraulic effect. The article also describes a method of mathematic calculations of output ...
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Bed turbulent kinetic energy boundary conditions for trapping efficiency and spatial distribution of sediments in basins
The purpose of this study is to develop and validate a numerical tool for evaluating the performance of a settling basin regarding the trapping of suspended matter. The Euler-Lagrange approach was chosen to model the flow and sediment transport. The numerical model developed relies on the open source library OpenFOAM®, enhanced with new particle/wall interaction conditions to limit sediment ...
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Influence of turbulence closure on the simulation of flow and dispersion in complex terrain
A dispersion simulation test for the RAMS-MIRS-SPRAY (RMS) modelling system in real complex terrain is presented. As a test case, the TRACT campaign was chosen because this data set allows the comparison of both the meteorological variables and the tracer concentrations. Particular attention was focused on testing alternative turbulence closures and assessing their influence on modelling both the ...
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The Structure of Turbulence and mixed-phase Cloud Microphysics in a Highly Supercooled Altocumulus Cloud
Abstract: Observations of vertically resolved turbulence and cloud microphysics in a mixed-phase altocumulus cloud are presented using in situ measurements from an instrumented aircraft. The turbulence spectrum is observed to have an increasingly negative skewness with distance below cloud top, confirming that longwave radiative cooling from the liquid layer cloud is thesource of turbulence ...
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A solution for the two-dimensional transport equation for photons and electrons in a rectangular domain by the Laplace transform technique
In the first part of this paper, we describe a review in the Laplace transform technique applied to SN two-dimensional transport equation in a rectangular domain considering Compton scattering. In Compton scattering the incident photon interacts with an electron of the irradiated medium, giving the electron kinetic energy, and also producing a scattered photon. In order to track that electron, in ...
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Experimental studies on hydrophobic flocculation of coal fines in aqueous solutions and flotation of flocculated coal
Hydrophobic flocculation of fine bituminous coal particles in aqueous solutions under mechanical conditioning and without any surfactants has been experimentally studied through the measurements of aggregative efficiency, zeta potential and contact angle in this work. The results have shown that the hydrophobic coal fines strongly aggregated in a wide pH range (3.5?9.5), even though the particle ...
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Distribution of mean flow and turbulence statistics in plunge pools
When the capacity of the spillway of a dam is exceeded for a given flood, overtopping occurs; in such cases potentially dangerous hydrodynamic actions and scour downstream of the dam need to be foreseen. Detailed studies of jets impinging in plunge pools from overflow nappe flows are scarce. This work addresses plunge pool flows, and compares numerical results against our own experiments. The ...
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A novel FACTS dynamic stabilisation scheme for stand-alone tidal energy conversion systems
Renewable abundant ocean kinetic energy has become increasingly popular as a consequence of strong ecological viable concerns and economical energy solutions in remote island communities. However, the integration of dispersed renewable tidal energy will pose a greater challenge to the power quality of distribution networks in remote areas due to fluctuation of the tidal stream velocity. The paper ...
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Modelling oil degradation in electric transformer oil under typical loads
In testing transformer oils for durability, it is desirable to use typical transformer operating conditions with appropriate allowances for factor of safety against temperature and voltage. The kinetics of degradation of used type II transformer oil with original flash point of 148?C, pour point of 51?C, and water content of 4 ppm was investigated. Assuming that the oil temperature in models Pr01 ...
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The Real Cost Associated With Neodymium Wind Turbines
According to a research organized by a group of UK scientists, it is predicated that 15% of the country’s energy requirements in the year 2020 are expected to come from renewable energy sources. They have also considered about the wind farms that are popping in every corner of the country to come into this conclusion. These reports have created several contradictions among people as well. ...
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Predicting actual reactor conditions: why time–domain simulation is necessary for BWR stability
Despite two decades of development and successful use of coupled thermal–hydraulics/neutron–kinetics (TH/NK) codes for the analysis of design basis accidents, the application of coupled codes to BWR stability transients remains a formidable challenge. While the issues in physical models and numerical methods can be identified, quantified and managed through special developments and ...
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Producing Green Energy: Must Have
In today’s world, everything we do almost revolve around power and power generating equipment are very necessary for that matter. Industrial, commercial and residential needs drive the need for the generation of power and power equipment. There is a very rapid growth of this need which begins in huge plants and then is disbursed using power lines to substations and finally to the ...
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The Structure of Turbulence and mixed-phase Cloud Microphysics in a Highly Supercooled Altocumulus Cloud
Abstract. Observations of vertically resolved turbulence and cloud microphysics in a mixed-phase altocumulus cloud are presented using in situ measurements from an instrumented aircraft. The turbulence spectrum is observed to have an increasingly negative skewness with distance below cloud top, confirming that longwave radiative cooling from the liquid layer cloud is the source of turbulence ...
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Introduction to some kinds of renewable energy
Clean energy is a kind of energy which does not produce pollutants in the use procedure. It includes nuclear energy and "renewable energy". Renewable energy refers to a kind of inexhaustible energy such as hydropower, wind power, solar energy, biomass energy (biogas), water energy, and tidal energy and so on. Renewable energy doesn’t have the possibility of energy depletion, and ...
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Tidal power - A different perspective
Kepler Energy is taking a different approach to tidal power, applying a design that can be used in benign sea conditions in a location closer to end-demand and which could generate utility-scale quantities of power, as Peter Dixon explains.The physical environment of tidal turbines is clearly very different to that of wind turbines, not least because water is a lot denser than air! However, ...
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Winds of Change: Offshore Wind Farms at the Forefront of Energy Transition
At a time when the importance of turning to sustainable energy sources and reducing our carbon footprint is increasingly recognised, offshore wind farms represent a ray of hope amid growing concerns about the energy crisis. They constitute a significant step forward in the search for long-term solutions in the field of renewable energies and sustainable development. In this article, we take a ...
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Energy storage implementation to reach carbon neutrality
Summary The massive deployment of intermittent renewables to achieve the decarbonization targets set out in Paris Agreement by 2050, is arising power management concerns while integrating with the power system due to the variability and intermittency of their renewable energy sources. The implementation of energy storage systems will lead to more efficient energy management system since the ...
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Which is more efficient solar or wind energy?
Before we start our reasoning, we'd like to remind you that both are renewables, and therefore both are great energy options to turn to to improve our planet and to break our addiction to oil and gas. Today we will try to answer a question that we often ask ourselves when we are interested in renewable energies : between solar and wind energy, which is the most efficient? First, let's take a ...
By Abora Solar
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