Development And Performance Analysis Of New Spade Bit Designs Pdf Kornel Ehmann

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Modeling and simulation of multiphase multicomponent multiphysics porous media flows in the context of chemical enhanced oil recovery. One of the most important methods of chemical enhanced oil recovery EOR involves the use of complex flooding schemes comprising of various layers of fluids mixed with suitable amounts of polymer or surfactant or both.

The fluid flow is characterized by the spontaneous formation of complex viscous fingering patterns which is considered detrimental to oil recovery. Here we numerically study the physics of such EOR processes using a modern, hybrid method based on a combination of a discontinuous, multiscale finite element formulation and the method of characteristics.

We investigate the effect of different types of heterogeneity on the fingering mechanism of these complex multiphase flows and determine the impact on oil recovery. We also study the effect of surfactants on the dynamics of the flow via reduction of capillary forces and increase in relative permeabilities.

The current study aims to predict the steady state power of a generic solution vessel and to develop a corresponding heat transfer coefficient correlation for a Moly99 production facility by conducting a fully coupled multi-physics simulation. A prediction of steady state power for the current application is inherently interconnected between thermal hydraulic characteristics i.

Thus, the development of a coupling methodology is vital to understand the system behavior at a variety of system design and postulated operating scenarios. In this study, we report on the k-effective keff calculation for the baseline solution vessel configuration with a selected solution concentration using MCNP K-code modeling. The associated correlation of thermal properties e.

The numerical coupling methodology between multiphase CFD and MCNP is successfully demonstrated, and the detailed coupling procedure is documented. In addition, improved coupling methods capturing realistic physics in the solution vessel thermal-neutronic dynamics are proposed and tested further i. As a key outcome of the current study, a multi-physics coupling methodology between MCFD and MCNP is demonstrated and tested for four different operating conditions.

Those different operating conditions are determined based on the neutron source strength at a fixed geometry condition. The steady state powers for the generic solution vessel at various operating conditions are reported, and a generalized correlation of the heat transfer coefficient for the current application is discussed.

The assessment of multi-physics. Modeling multiphase materials processes. The book focuses on systems involving gas-liquid interaction, the most prevalent in current metallurgical processes. The performance characteristics of these processes are largely dependent on transport phenomena. This volume covers the inherent characteristics that complicate the modeling of transport phenomena in such systems, including complex multiphase structure, intense turbulence, opacity of.

Multiphysics modeling of magnetorheological dampers. Full Text Available The dynamics of a small scale magnetorheological damper were modeled and analyzed using multiphysics commercial finite element software to couple the electromagnetic field distribution with the non-Newtonian fluid flow.

Coupling of the physics is achieved through a modified Bingham plastic definition, relating the fluid's dynamic viscosity to the intensity of the induced magnetic field. Good agreement is confirmed between simulation results and experimentally observed resistance forces in the damper.

This study was conducted to determine the feasibility of utilizing magnetorheological dampers in a medical orthosis for pathological tremor attenuation.

The implemented models are thus dimensioned on a relatively small scale. The method used, however, is not specific to the damper's size or geometry and can be extended to larger-scale devices with little or no complication. Multiphysics modeling of a rail gun launcher. Full Text Available A finite element based multiphysics modeling was conducted for a rail gunlauncher to predict the exit velocity of the launch object, and temperaturedistribution.

For this modeling , electromagnetic field analysis, heat transferanalysis, thermal stress analysis, and dynamic analysis were conducted fora system consisting of two parallel rails and a moving armature. In particular,an emphasis was given to model the contact interface between rails andthe armature.

A contact theory was used to estimate the electric as well asthermal conductivities at the interface. Using the developed model , aparametric study was conducted to understand effects of variousparameters on the exit velocity as well as the temperature distribution in therail gun launcher. Multiphysics modelling of manufacturing processes: A review. Numerical modelling is increasingly supporting the analysis and optimization of manufacturing processes in the production industry.

Even if being mostly applied to multistep processes, single process steps may be so complex by nature that the needed models to describe them must include multiphysics For all five examples, the emphasis is on modelling results as well as describing the models in brief mathematical details.

Alongside with relevant references to the original work Multiphysics modelling of the spray forming process. An integrated, multiphysics numerical model has been developed through the joint efforts of the University of Oxford UK , University of Bremen Germany and Inasmet Spain to simulate the spray forming process.

The integrated model consisted of four sub- models : 1 an atomization model simulating the fragmentation of a continuous liquid metal stream into droplet spray during gas atomization; 2 a droplet spray model simulating the droplet spray mass and enthalpy evolution in the gas flow field prior to deposition; 3 a droplet deposition model simulating droplet deposition, splashing and re-deposition behavior and the resulting preform shape and heat flow; and 4 a porosity model simulating the porosity distribution inside a spray formed ring preform.

The model has been validated against experiments of the spray forming of large diameter IN Ni superalloy rings. The modelled preform shape, surface temperature and final porosity distribution showed good agreement with experimental measurements. Multiphysics modelling and experimental validation of high concentration photovoltaic modules.

Such systems are more complex compared to conventional photovoltaics because of the multiphysics effect that is present. Modelling the power output of such systems is therefore crucial for their further market penetration. Following this line, a multiphysics modelling procedure for high concentration photovoltaics is presented in this work. It combines an open source spectral model , a single diode electrical model and a three-dimensional finite element thermal model. In order to validate the models and the multiphysics modelling procedure against actual data, an outdoor experimental campaign was conducted in Albuquerque, New Mexico using a high concentration photovoltaic monomodule that is thoroughly described in terms of its geometry and materials.

The experimental results were in good agreement within 2. This multiphysics approach is relatively more complex when compared to empirical models , but besides the overall performance prediction it can also provide better understanding of the physics involved in the conversion of solar irradiance into electricity.

It can therefore be used for the design and optimisation of high concentration photovoltaic modules. In the model , ion diffusion is allowed between the individual bentonite blocks and between the bentonite blocks and a sand layer filling the bentonite-rock gap.

The effective diffusion coefficient values for individual bentonite blocks were estimated based on the dry density of the bentonite, and the temperature-dependent evolution of the diffusion coefficients is approximated in the course of the simulation.

In order to solve the problem, a set of non-linear algebraic equations mass action law for the cation-exchange reactions, and charge and mass balance equations have been coupled with Fickian diffusion equations.

Preliminary results for the studied problem indicate that the effect of diffusion for the studied cations and chloride is significant and has the potential to explain quantitatively the observed patterns of homogenisation in the chemical composition in the bentonite package. However, the work is currently in progress and further analyses, including a sensitivity study of variables such as diffusion coefficients and boundary conditions, are on-going. A model simulating coupled cation-exchange and diffusion of major ions in the Package 1 of the ABM field experiment has been developed.

This work demonstrates the feasibility of implementing a reactive transport model directly into Comsol Multiphysics using conservation and mass action equations.

Comsol offers an intuitive and at the same time powerful modelling environment for simulating coupled multiphase , multi-species reactive transport phenomena and mechanical effects in complex geometries.

Such code integration has the potential to provide tools uniquely suited to solving complicated reactive. Kesterson, M. Savannah River National Lab. The U. Efforts are being made to increase the loading of Hanford tank wastes in glass while meeting melter lifetime expectancies and process, regulatory, and product quality requirements.

Wastes containing high concentrations of Al 2 O 3 and Na 2 O can contribute to nepheline generally NaAlSiO 4 crystallization, which can sharply reduce the chemical durability of high level waste HLW glass. Nepheline crystallization can occur during slow cooling of the glass within the stainless steel canister. The purpose of this work was to develop a model that can be used to predict temperatures of the glass in a WTP HLW canister during filling and cooling.

The intent of the model is to support scoping work in the laboratory. It is not intended to provide precise predictions of temperature profiles, but rather to provide a simplified representation of glass cooling profiles within a full scale, WTP HLW canister under various glass pouring rates.

These data will be used to support laboratory studies for an improved understanding of the mechanisms of nepheline crystallization. The model results were compared to available experimental data, TRR-PLT, and were found to yield sufficient results for the scoping nature of the study. Multiphysics Modeling Using COMSOL rapidly introduces the senior level undergraduate, graduate or professional scientist or engineer to the art and science of computerized modeling for physical systems and devices.

It offers a step-by-step modeling methodology through examples that are linked to the Fundamental Laws of Physics through a First Principles Analysis approach. The text explores a breadth of multiphysics models in coordinate systems that range from 1D to 3D and introduces the readers to the numerical analysis modeling techniques employed in the COMSOL Multiphysics software.

After readers have built and run the examples, they will have a much firmer understanding of the concepts, skills, and benefits acquired from the use of computerized modeling techniques to solve their current technological problems and to explore new areas of application for their particular technological areas of interest.

Multiphysics Modelling of Sodium Sulfur Battery. Due to global climate change and the desire to decrease greenhouse gas emissions, large scale energy storage has become a critical issue. Renewable energy sources such as wind and solar will not be a viable energy source unless the storage problem is solved.

One of the practical and cost effective solutions for this problem is sodium sulfur batteries. Due to the use of porous materials in the electrodes, capillary pressure and the combination of capillary action and gravity become important. Capillary pressure has a strong dependence on the wetting phase liquid electrode material saturation; therefore sharp concentration gradients can occur between the inert gas and the electrode liquid, especially within the cathode. These concentration gradients can have direct impacts on the electrodynamics of the battery as they may produce areas of high electrical potential variation, which can decrease efficiency and even cause failures.

Then, thermal management also becomes vital since the electrochemistry and material properties are sensitive to temperature gradients. To investigate these phenomena in detail and to attempt to improve upon battery design a multi-dimensional, multi-phase code has been developed and validated in this study. Then a porous media flow model is implemented. Transport equations for charge, mass and heat are solved in a time marching fashion using finite volume method. Material properties are calculated and updated as a function of time.

The porous media model is coupled with the continuity equation and a separate diffusion equation for the liquid sodium in the melt. The total mass transport model is coupled with charge transport via Faraday's law. Results show that. This book reports on the state of the art in the field of multiphysics systems. The different chapters, covering new theories, methods and a number of case studies, provide readers with an up-to-date picture of multiphysics modeling and simulation. They highlight the role played by high-performance computing and newly available software in promoting the study of multiphysics coupling effects, and show how these technologies can be practically implemented to bring about significant improvements in the field of design, control and monitoring of machines.

In addition to providing a detailed description of the methods and their applications, the book also identifies new research issues, challenges and opportunities, thus providing researchers and practitioners with both technical information to support their daily work and a new source of inspiration for their future Predictive modeling of coupled multi-physics systems: I. The PMCMPS methodology uses the maximum entropy principle to construct an optimal approximation of the unknown a priori distribution based on a priori known mean values and uncertainties characterizing the parameters and responses for both multi-physics models.

Subsequently, the posterior distribution thus obtained is evaluated using the saddle-point method to obtain analytical expressions for the optimally predicted values for the multi-physics models parameters and responses along with corresponding reduced uncertainties.

Bimanual Interaction for Medical Virtual Environments: Palpation and Needle Intervention

Ehmann, Ph. James N. Students 1. Su, Static Analysis of Turbine Blade Keshmiri, Development of an End-Effector for Riveting Mathew, Design and Analysis of a Micropositioning Device Yeh, Error Simulation for a Multi-axis Machine

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Modeling and simulation of multiphase multicomponent multiphysics porous media flows in the context of chemical enhanced oil recovery. One of the most important methods of chemical enhanced oil recovery EOR involves the use of complex flooding schemes comprising of various layers of fluids mixed with suitable amounts of polymer or surfactant or both. The fluid flow is characterized by the spontaneous formation of complex viscous fingering patterns which is considered detrimental to oil recovery. Here we numerically study the physics of such EOR processes using a modern, hybrid method based on a combination of a discontinuous, multiscale finite element formulation and the method of characteristics. We investigate the effect of different types of heterogeneity on the fingering mechanism of these complex multiphase flows and determine the impact on oil recovery.

Modeling and simulation of multiphase multicomponent multiphysics porous media flows in the context of chemical enhanced oil recovery. One of the most important methods of chemical enhanced oil recovery EOR involves the use of complex flooding schemes comprising of various layers of fluids mixed with suitable amounts of polymer or surfactant or both. The fluid flow is characterized by the spontaneous formation of complex viscous fingering patterns which is considered detrimental to oil recovery. Here we numerically study the physics of such EOR processes using a modern, hybrid method based on a combination of a discontinuous, multiscale finite element formulation and the method of characteristics. We investigate the effect of different types of heterogeneity on the fingering mechanism of these complex multiphase flows and determine the impact on oil recovery.

Soorya Prakash, and V. Kavimani Cold deformation of dezincification resistant yellow brass for plumbing applications S. Sivasankaran, Abdulaziz S. Alaboodi, and Fahad Al-Mufadi Rapid synthesis of nano-magnetite by thermal plasma route and its magnetic properties E. Koushika, G.

Чатрукьян не был бы так раздражен, если бы ТРАНСТЕКСТ был его единственной заботой. Однако это было не. Несмотря на свой внушительный вид, дешифровальное чудовище отнюдь не было островом в океане.

 Он работает на Монокле, - пояснил Смит.  - Посылает сообщение о том, что Танкадо ликвидирован. Сьюзан повернулась к Беккеру и усмехнулась: - Похоже, у этого Халохота дурная привычка сообщать об убийстве, когда жертва еще дышит. Камера последовала за Халохотом, двинувшимся в направлении жертвы.

Сиди себе в заднем салоне и докуривай окурки. Хорошенькая картинка. Беккер застонал и провел рукой по волосам. - Когда он вылетает. - В два часа ночи по воскресеньям.

 Травматическая пуля, - задумчиво повторил Беккер.

3 Response
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