Engineering Commons^™

Ceramic Matrix Composite Environmental Protection Strategies, Bradley Richards, Hengbei Zhao, Haydn Wadley

Thermal Barrier Coatings IV

No abstract provided.

Keynote Talk – Novel Convective Heat Transfer Enhancement In Channels And Tubes Filled With Nanofluid-Saturated Metal Foams, Fumika Sakai, Wenhao Li, Akira Nakayama

5th International Conference on Porous Media and Their Applications in Science, Engineering and Industry

A local thermal non-equilibrium theory was exploited to investigate heat transfer in nanofluid saturated porous media, in view of possible heat transfer applications of metal foams filled with nanofluids as high performance heat exchangers. The resulting set of the macroscopic equations based on the modified Buongiorno model proposed by Yan et al. for convective heat transfer in nanofluids were used to obtain the analytical solutions for laminar fully developed forced convection in channels and tubes filled with nanofluid saturated metal foams. The analytical and numerical solutions were obtained for laminar fully developed forced convection in channels and tubes filled with …

Upel Presents Paper At Compel 2014 | Utah State University Power Electronics Lab, Usu College Of Engineering

College of Engineering News

UPEL Student, Warren Chen, published a paper at COMPEL this year, the annual conference for Control and Modeling for Power Electronics. The paper, titled "Isolated bidirectional DC/AC and AC/DC three-phase power conversion using series resonant converter modules and a three-phase unfolder", highlights recent research with a Dual Active-Bridge Resonant Power converter. The converter, paired with a three-phase unfolder is able to achieve low AC THD without the need for a bulky LC filter, instead using the large bandwidth of the converter.

Development Of A Mobile High Shear Colloidal Grout Pump For The Construction Industry, John Kijak, David Kennedy

Conference Papers

The aim of this project was to design and develop a group pump and solve associated technical issues for a construction company in Ireland. The design is based on a high shear colloidal group mixing and pumping rig. The initial machine has failed in terms of bearing and seal performance, has high manufacturing costs and is poorly designed.

To account for these issues, extensive research of the design features of grout mixing units from various competitors and suppliers was carried out by research and field studies at trade fairs. Using the information gathered, and incorporating improvements into the existing design, …

The Impact Of Fuzzy Requirements On Medical Device Software Development, Martin Mchugh, Abder-Rahman Ali, Fergal Mccaffery

Conference papers

Any software development project can experience difficulties with unclear or vague requirements. Unfortunately, this problem can be experience two fold in regulated environments such as the medical device software development industry. In the medical device software development industry, development organisations must contend with vague or “fuzzy” both the customer and regulatory bodies. As new requirements are introduced they can have a knock on effect on other requirements. These requirements should be analysed to determine if they are conflicting, cooperative, mutually exclusive and irrelevant. Only when the requirement is classified can a clear method be established as how to integrate that …

A Multi-Period Mixed Integer Linear Programming Model For Desalination And Electricity Co-Generation In Kuwait, Nael Abdulhameed Alqattan

USF Tampa Graduate Theses and Dissertations

Water is the root of life and the engine that drives agriculture, industry, economy and services. The demand for water often necessitates desalination, particularly in arid coastal environments where there are several desalination technologies in use today such as Multi-Effect Distillation (MED) and Reverse Osmosis (RO). The key utility requirement for technologies such as desalination and population in general include energy in one form or another. Therefore, desalination and co-generation are often integrated. Another key utility is electricity which is generated from either renewable or non-renewable sources. The demands for water and electricity change over time and are subject to …

Calculated Vs. Experimental Values For Volume And Surface Resistivity In Various Polymer Compounds, Megan Webster

Pursuit - The Journal of Undergraduate Research at The University of Tennessee

Versatile due to their resistance to high stress environments including but not limited to extreme temperature, pressure, and stress, polymers additionally have many uses in electrical applications wherein antistatic or conductive properties are preferential, i.e. conductive seals, oil pipeline spheres, and gaskets, to name a few. Being a complex material, many factors may affect the electrical resistivity of a given polymer compound including type and amount of carbon black, type of rubber, cure time and temperature, and dispersion, amongst other factors. External conditions such as relative humidity and temperature also play key roles. This paper will analyze five different rubber …

Mathematically Modeling Fetal Electrocardiograms, Samuel Estes, Kiersten Utsey, Erick Kalobwe

Pursuit - The Journal of Undergraduate Research at The University of Tennessee

Abstract

Some of the most common and fatal birth defects are those related to the heart. In adults, possible heart conditions are often identified through the use of an electrocardiogram (ECG). However, due to the presence of other signals and noise in the recording, fetal electrocardiography has not yet proven effective in diagnosing these defects. This paper develops a mathematical model of three-dimensional heart vector trajectories, which was used to generate synthetic maternal and fetal ECG signals. The dipole model is a useful simplification in which the electrical activity of the heart is viewed as a single time-varying vector originating …

Simulation Of A Smart Home Energy Management System With Dynamic Price Response, Jason Y. Chan, Qinran Hu

Pursuit - The Journal of Undergraduate Research at The University of Tennessee

With the continuing development of the smart grid combined with the fluctuating nature of the electricity market, the development of demand-side management with controllable loads have been greatly driven. With the amount of household loads in the residential sector, managing their energy usage has received lots of interest. This paper presents a simulation of a previously proposed hardware design of a smart home energy management system (SHEMS), focusing on the data collection and processing functions of the proposed design while implementing them onto standard household loads like an electric water heater and an electric vehicle charging station. It was found …

Vehicle Multi-Pass Rut Volume And Mobility Power Study, William W. Barbour

Pursuit - The Journal of Undergraduate Research at The University of Tennessee

This paper presents the relationship between applied power by a wheeled vehicle to soil and the rutting effects. Specifically, a strong positive relationship was found between cumulative applied power and total rut volume across multiple passes by the vehicle over the same tracks. Field-testing was conducted using a high-mobility multi-purpose wheeled vehicle (HMMWV) and two distinct soil types. Sensors on the vehicle measured torque and angular velocity of each of the four wheels, from which applied power was calculated. A rut profile meter was used to document the shape of the rut after set numbers of passes and this profile …

Story Guided Virtual Cultural Heritage Applications, Selma Rizvic

Journal of Interactive Humanities

Virtual cultural heritage applications, particularly virtual museums, nowadays include various forms of storytelling. Every object, site or artifact is better perceived and understood through the adjoining story. Interactive applications naturally request the storytelling to become interactive as well. This paper describes the concepts of interactive digital storytelling in our virtual museums and cultural heritage presentations and discusses their advantages and drawbacks recognized through user evaluation. We used digital stories not only to introduce visitors with the context and information on the objects, but also to enhance their navigation through virtual environments with purpose of learning and perceiving maximum amount of …

Effect Of Variable Porosity On Composite Heat Transfer In A Boundary Layer Flow, Puttabasavsetty Nagaraju

5th International Conference on Porous Media and Their Applications in Science, Engineering and Industry

The effects of variable porosity and variable thermal conductivity of the medium and also the emission, absorption and scattering of radiation are studied in this paper. The comparative study has been made for three different situations, namely a) variable porosity b) constant porosity and c) absence of porous medium.In carrying out the solution, the momentum and energy equations are coupled and they are solved simultaneously by Runge-Kutta Gill method in conjunction with Newton-Raphson iterative scheme. The results of the analyses show that, in the cases of variable porosity and absence of porous medium the velocity profiles possess very small curvature …

Mri Evidence Of Nanoparticles Migration In Drying Porous Media, Emmanuel Keita, Pamela Faure, Stephane Rodts, Phillippe Coussot

5th International Conference on Porous Media and Their Applications in Science, Engineering and Industry

Due to the migration of elements they induce imbibition-drying cycles are known to play a major role in the colloid-facilitated transport in many industrials process, for instance for pollutants migration in soils or pores clogging in building materials. We study the drying of a colloidal suspension in a porous media. The critical physical phenomenon at work here is the displacement and redistribution of colloidal particles induced by evaporation of the liquid phase from the porous medium. This can be clearly seen by filling a bead packing with coffee. Indeed after full drying the sample has shaded tones with darker regions …

Phase Change With Local Thermal Non-Equilibrium In A Two-Phase Mixture Model, Franz Lindner, Michael Pfitzner, Christian Mundt

5th International Conference on Porous Media and Their Applications in Science, Engineering and Industry

CFD solutions of multi-phase, single-component flow through a vertical channel, filled with a porous medium, heated from one side, are shown. Steady-state solutions are presented for Darcian flow through capillary porous media. Local thermal non- equilibrium is used with a two-phase mixture. The effects of variation of Peclet-number and dimensionless heat input are shown. The displacement effect of the super-heated vapor reduces the free cross-section of flow of the liquid fluid and accelerates the liquid fluid flowing past the evaporation front. The temperatures, liquid saturations, liquid and vapor heat transfer coefficients are shown for cases with super-heated vapor.

Effects Of Non-Darcy Flow And Pore Proximity On Gas Condensate Production From Nanopore Unconventional Resources, Alireza Sanaei, Ahmad Jamili, Jeffrey Callard

5th International Conference on Porous Media and Their Applications in Science, Engineering and Industry

Transport properties and mechanisms as well as phase behavior under nanoscale confinement exhibit significant deviations from their bulk behavior. Phase behavior due to the significant effect of molecule-wall interactions as well as molecule-molecule interactions changes in nanopores. Additionally, in nanopores, when the mean free path of molecules is in the order of the pore radius, non-Darcy flow occurs. This phenomenon causes an increase in effective permeability of the flowing fluid. In this study, we focus on analyzing and determining the effect of phase behavior and transport properties change due to pore proximity on production from a shale gas condensate reservoir. …

Performance Comparison Of The Finite-Difference, Practical-Finite-Analytic, Differential-Quadrature, And Differential-Cubature Methods For Solving Porous Media Immiscible Fluids Transport, Faruk Civan

5th International Conference on Porous Media and Their Applications in Science, Engineering and Industry

Reviews and comparisons of the finite-difference, differential-quadrature, differential-cubature, finite-analytic, and practical-finite-analytic methods are presented. Numerical solution of immiscible fluids transport in porous media are illustrated. The cubature and practical finite-analytic methods are shown to have apparent advantages over the other methods because the numerical solution schemes are derived directly from the specific problems of interest.

A Simplified Model For Transport In Aquifers, Robert Mckibbin, Amjad Ali, Winston Sweatman

5th International Conference on Porous Media and Their Applications in Science, Engineering and Industry

Chemicals that are dissolved in groundwater flow along with the slow-moving water as it makes its way through the complex pores of the aquifer; during this process they are dispersed in different directions. The rate of dispersion depends on the porous structure and the fluid speed. Many groundwater aquifers have a natural layered structure; here this is used to advantage by discretizing them into "almost horizontal" layers, where each may have different matrix properties such as thickness, permeability, dispersivity, porosity, etc. The mean dynamic pressure (or mean hydraulic head) may be assumed constant vertically at each horizontal point if it …

Cmas Deposition Within The Turbine Of A Small Jet Engine And Effects On Tbc Spallation, Tw Clyne

Thermal Barrier Coatings IV

No abstract provided.

Yttrium Oxide A Candidate Material For Environmental And Thermal Barrier Coatings, Peter Mechnich, Wolfgang Braue, Nadine K. Eils, Stefan Hackemann, Ravisankar Naraparaju

Thermal Barrier Coatings IV

No abstract provided.

Examination Of Cmas-Induced Eb-Pvd Tbc Failure, Vladimir Tolpygo

Thermal Barrier Coatings IV

No abstract provided.

Development Of A Naturalistic Test Media For Dust Ingestion Cmas Testing Of Gas Turbine Engines, Andrew W. Phelps, Lynne Pfledderer

Thermal Barrier Coatings IV

No abstract provided.

A Thermodynamic Database For Simulation Of Cmas And Tbc Interactions, Lina Kjellqvist, Johan Brattberg, Ake Jansson, Huahai Mao

Thermal Barrier Coatings IV

A thermodynamic database has been developed for calculating thermochemical interaction of thermal barrier coatings, namely 7YSZ (yttria partially stabilized zirconia), with CaO-MgO-Al2O3-SiO2 (CMAS) deposits. CaO-MgO-Al2O3-SiO2-Y2O3-ZrO2 is thus the core system for understanding and modeling of processes occurring between CMAS and TBC. A good thermodynamic description of all phases in the system is essential in modeling related to materials design and process optimization. An efficient technique used to obtain a self-consistent thermodynamic database is called the CALPHAD method [1], where the Gibbs energy of each phase is described with a mathematical model. The Gibbs energy of the total system is then …

Tbc Lifetime Under Thermal Gradient Cyclic Testing With Simultaneous Cmas Attack: Towards Prediction Of Advanced Tbc Performance, Daniel Emil Mack, Doris Sebold, Michael Müller, Robert Vaseen, Maria Ophelia Jarligo, Tanja Wobst

Thermal Barrier Coatings IV

No abstract provided.

Cmas Degradation And Implications For Coating Design, Arlos Levi

Thermal Barrier Coatings IV

No abstract provided.

Aps Tbc Life Prediction - Impact Of Manufacturing Variations, Stefan Lampenscherf, Ramesh Subramanian

Thermal Barrier Coatings IV

No abstract provided.

Probabilistic Lifetime Prediction Of Tbc Coated Parts Considering Design, Operation And Manufacturing + Thermal Barrier Coatings Ageing Mechanisms In Land-Based Gas Turbines, Hans Peter Bossmann, Gregoire Witz

Thermal Barrier Coatings IV

A lifing model has been developed based on lab testing to describe the time-temperature-dependence of TBC spallation. An extensive parameter study, using serial parts and coating processes, was done to investigate the affect of manufacturing scatter on TBC life as well as on thermal loading. The impacts of several parameters have been quantified. The transfer to part level has to consider the overall boundary conditions, i.e. increased TBC thickness will reduce on one hand the bondcoat temperature and the risk of spallation, but on the other hand, the increased thickness will increase the stresses within the TBC and the risk …

Attack Of Thermal Barrier Coatings By Molten Silicate Deposits (Sand, Ash) And Its Mitigation, Nitin P. Padture

Thermal Barrier Coatings IV

No abstract provided.

Studies On Permeability Properties And Particle Capture Efficiencies Of Porous Sic Ceramics Processed By Oxide Bonding Technique, Atanu Dey, Nijhuma Kayal, Omprakash Chakrabarti, Rafael Caldato, Caio Andre, Murilo Innocentini, Vadila Guerra

5th International Conference on Porous Media and Their Applications in Science, Engineering and Industry

Porous SiC ceramics bonded with mullite (MBS of fractional porosity (e) of 0.29-0.56, average pore size (dpore) of 5-11 μm, flexural strength (σ) of 9-34 MPa and elastic modulus (E) of 7-28GPa) and cordierite (CBS with e of 0.33-0.72, dpore of 6-50 μm, σ of 5-54 MPa and E of 6-42 GPa) were prepared by heating in air at 1350-1500°C compacts of desired amounts of SiC, Al2O3 and MgO powders and petroleum coke dust as the pore former. Air permeation behavior of well-characterized samples was studied with fluid superficial velocity (vs) from 0.08 to 1.0 m s-1and at RT to …

Fractional Diffusion Model For Transport Through Porous Media, Iftikhar Ali, Nadeen Malik, Bilal Chanane

5th International Conference on Porous Media and Their Applications in Science, Engineering and Industry

We model the transport of fluid through porous media in terms of fractional diffusion equation (FDE) for the pressure (,)pxt. Potential application could be to shale gas recovery in tight porous media. Specifically, we pose the time FDE in a finite domain of length L.

Cama Newsletter - June, 2014, Civil Aviation Medical Association

Browse all Civil Aviation Medical Association Newsletters

A twelve page newsletter of the Civil Aviation Medical Association. The newsletter provided news about civil aviation medicine and information related to the organization.