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2014

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Articles 271 - 300 of 616

Full-Text Articles in Materials Science and Engineering

Yttrium Oxide A Candidate Material For Environmental And Thermal Barrier Coatings, Peter Mechnich, Wolfgang Braue, Nadine K. Eils, Stefan Hackemann, Ravisankar Naraparaju Jun 2014

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 Jun 2014

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 Jun 2014

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 Jun 2014

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 Jun 2014

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 Jun 2014

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 Jun 2014

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 Jun 2014

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 Jun 2014

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 Jun 2014

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 Jun 2014

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.


Solubility Of Oxides From Zro2-Y2o3 And Zro2-Nd2o3 Systems In A Molten Cas. Selection Of A Thermal Barrier Composition Resistant To Cas Infiltration, Marie-Helene Vidal-Setif, Catherine Rio, Odile Lavigne, Nezha Chellah, Michel Vilasi, Cristophe Rapin, Carine Petitjean, Pierre Jean Panteix Jun 2014

Solubility Of Oxides From Zro2-Y2o3 And Zro2-Nd2o3 Systems In A Molten Cas. Selection Of A Thermal Barrier Composition Resistant To Cas Infiltration, Marie-Helene Vidal-Setif, Catherine Rio, Odile Lavigne, Nezha Chellah, Michel Vilasi, Cristophe Rapin, Carine Petitjean, Pierre Jean Panteix

Thermal Barrier Coatings IV

No abstract provided.


Effect Of Temperature Dependent Viscosity On Natural Convective Boundary Layer Flow Over A Horizontal Plate Embedded In A Nanofluid Saturated Porous Medium, Shoba Bagai, Chandrashekhar Nishad Jun 2014

Effect Of Temperature Dependent Viscosity On Natural Convective Boundary Layer Flow Over A Horizontal Plate Embedded In A Nanofluid Saturated Porous Medium, Shoba Bagai, Chandrashekhar Nishad

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

The effect of temperature dependent viscosity on natural convective boundary-layer flow of a nano-fluid over an isothermal horizontal plate is investigated numerically. The viscosity of the fluid is assumed to have an exponentially decaying dependence on temperature ν=ν0e−b(T−T∞). A similarity analysis is presented for field equations embodying conservation of total mass, momentum, thermal energy and nano-particles. The analysis shows that velocity, temperature and nano-particle volume fraction profiles in the respective boundary layers depend on the viscosity parameter γ besides the pertinent parameters such as buoyancy ratio Nr, Brownian motion Nb, thermophoresis Nt and Lewis number Le. From physical considerations one …


Miscible Density Driven Convective Mass Transfer Process Analysis Based On Entransy Dissipation Theory, Rong Li, Ruina Xu, Peixue Jiang, Huihai Liu, Jiannan Chen Jun 2014

Miscible Density Driven Convective Mass Transfer Process Analysis Based On Entransy Dissipation Theory, Rong Li, Ruina Xu, Peixue Jiang, Huihai Liu, Jiannan Chen

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

Density driven convective mass transfer process in porous media is one of the most universal phenomena in underground aquifer. In this study, an original model defining Nu (or Sh) number for miscible mass transfer system was derived, based on basic concept of integrated entransy dissipation rate. Numerical simulation results of density driven convective mass transfer process in a closed Hele-Shaw cell and porous media are analyzed. In the process of dilute brine-water mass transfer system in Hele-Shaw cell, three different stages were observed. Meanwhile, time dependent entransy variation and Nu number using our definition also show three different steps in …


Experimental Analysis Of Air Vortex Impingement Through Porous Screens, Xudong An, Howard Fultz, Fatemeh Hassanipour Jun 2014

Experimental Analysis Of Air Vortex Impingement Through Porous Screens, Xudong An, Howard Fultz, Fatemeh Hassanipour

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

This paper presents the experimental analysis of air flow vortex propagation through porous screens. This study is conducted by a new and unique experimental setup for ve- locity measurements and visualization of air vortex interac- tion with porous screen. A custom-made, high-precision vortex generator provides a variety of velocity profiles for vortex generation with an unprecedented level of precision. The flow fields are captured with the use of a fog gener- ator and a high-speed CCD camera. The porous screens are constructed out of acrylic rods with various orientations, thickness, and porosities from rod separation. The results presented in this …


Thermohydraulics Of Porous Heat Exchangers: Full Or Partial Blockage?, Kamel Hooman Jun 2014

Thermohydraulics Of Porous Heat Exchangers: Full Or Partial Blockage?, Kamel Hooman

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

No abstract provided.


Concentration Of Bioethanol And Dehydration Of Organic Solvents By Porous Membranes, Tadashi Uragami Jun 2014

Concentration Of Bioethanol And Dehydration Of Organic Solvents By Porous Membranes, Tadashi Uragami

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

In order to obtain higher membrane performance in the concentration of bioethanol and dehydration of organic solvents, porous poly[1-(trimethylsilyl)-1-propyne] (PTMSP) and porous chitosan membranes, respectively are applied to a temperature-difference controlled evapomeation (TDEV) method in which a temperature difference between the feed solution and the membrane surroundings is established. Pressure treated porous PTMS membranes showed a high ethanol concentration performance with a high permeation rate and porous chitosan membranes also showed a high dehydration performance in TDEV. Membrane performances through these porous membranes in TDEV are discussed from the viewpoints of physical structure of membranes and permeants.


Experimental Evaluation Of Wellbore Cement- Formation Shear Bond Strength In Presence Of Drilling Fluid Contamination, Mileva Radonjic, Arome Oyibo Jun 2014

Experimental Evaluation Of Wellbore Cement- Formation Shear Bond Strength In Presence Of Drilling Fluid Contamination, Mileva Radonjic, Arome Oyibo

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

The objective of this experimental study is to investigate the impact of physical and chemical mud contaminations on cement-formation shear bond strength for sandstone and shale formations. Physical contamination occurs when drilling fluids (mud) dehydrates on the surface of the formation, while chemical contamination on the other hand occurs when the drilling fluid (still in the liquid state) is mixed with cement slurry and reacts chemically with the cement during a cementing job. We investigated the impact of the contamination on the shear bond strength and the changes in the mineralogy of the cement at the cement-formation interface to quantify …


Quantification Of Effect Of Convergence In Porous Media Flow, Srinivas Pasupuleti, Pradeep Kumar, K. Jayachandra Jun 2014

Quantification Of Effect Of Convergence In Porous Media Flow, Srinivas Pasupuleti, Pradeep Kumar, K. Jayachandra

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

An attempt is made in this study to quantify the effect of convergence on macroscopic scale in the case of flow through porous media. Experiments are conducted separately on specially conceived parallel flow permeameter and converging flow permeameter keeping identical inlet and outlet conditions, using eight sizes of coarse granular media and water as the fluid medium. The media is sieved through sieves of different sizes to separate the crushed rock into sizes of 3.25 mm, 4.73 mm, 10.00 mm, 11.64 mm, 13.10 mm, 20.10 mm, 28.90 mm and 39.50 mm and glass spheres of 15.41 mm, 18.03 mm and …


A Model For Magnetic Drug Targeting In A Permeable Microvessel With Spherical Porous Carrier Particles, Precious Sibanda, Sachin Shaw Jun 2014

A Model For Magnetic Drug Targeting In A Permeable Microvessel With Spherical Porous Carrier Particles, Precious Sibanda, Sachin Shaw

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

We present a mathematical model for targeting a drug at malignant tissue cells in a permeable microvessel. The drug molecules are transported in carrier particles which are assumed to be porous spheres. This mode of drug delivery is non-invasive and has less toxic effects on healthy cells and tissues. The microvessel tube (see Figure 1) is subdivided into three regions, the outer endothelial glycocalyx layer where the blood has a Newtonian character, and a core and plug regions where the blood flow is described using a non-Newtonian Casson fluid model which is suitable for microvessels of radius 5mμ. Targeting is …


Multilayer Minichannel Heat Sinks: The Effect Of Porosity Scaling On Pressure Drop, Arun K. Karunanithi,, Fatemeh Hassanipour Jun 2014

Multilayer Minichannel Heat Sinks: The Effect Of Porosity Scaling On Pressure Drop, Arun K. Karunanithi,, Fatemeh Hassanipour

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

Previous studies have shown that stacked multi-layer mini-channels heat sinks with square or circular channels have advantages over traditional single layered channels in terms of both pressure drop and thermal resistance. In this work, porous media is used in the multi-layered stacked mini-channels instead of square or rectangular channels and the effect of the same on pressure drop and thermal perfor- mance is studied. Porosity scaling is done between the lay- ers of porous media and is compared with unscaled stacked multilayer channel. Porosity scaling allows the porosity to vary from one layer to the next layer and could result …


Numerical Simulation Of Pressure Pulse Decay Experiment On Crushed Low Permeability Rocks Considering Klinkenberg Effect And Gas Absorption/Desorption, Bo Zhou, Rui-Na Xu, Pei-Xue Jiang Jun 2014

Numerical Simulation Of Pressure Pulse Decay Experiment On Crushed Low Permeability Rocks Considering Klinkenberg Effect And Gas Absorption/Desorption, Bo Zhou, Rui-Na Xu, Pei-Xue Jiang

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

Pressure pulse decay method is widely used for permeability tests for low permeability rock plug samples. This method can be used for crushed grain samples by removing the downstream chamber in standard pulse decay tests. Processes in pulse decay tests for low permeability crushed shale are investigated using numerical simulation. Both the Klinkenberg slip effect for gas flows in low permeability rock and the gas absorption/desorption in the porous matrix are considered. The complete mathematical model is set up to include the two effects. Deviation of the numerical pulse decay curve from the analytical one with an assumption that the …


Fluid Flows Through Unsaturated Porous Media: An Alternative Simulation Procedure, Maria Laura Martins-Costa, Joao Carlos Castro Dias, Rogerio M. Saldanha Da Gama Jun 2014

Fluid Flows Through Unsaturated Porous Media: An Alternative Simulation Procedure, Maria Laura Martins-Costa, Joao Carlos Castro Dias, Rogerio M. Saldanha Da Gama

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

This article studies fluid flows through an unsaturated porous matrix, modeled under a mixture theory viewpoint, which give rise to nonlinear hyperbolic systems. An alternative procedure is employed to simulate these nonlinear nonhomogeneous hyperbolic systems of two partial differential equations representing mass and momentum conservation for the fluid (liquid) constituent of mixture. An operator splitting technique is employed so that the nonhomogeneous system is split into a time-dependent ordinary portion and a homogeneous one. This latter is simulated by employing Glimm’s scheme and an approximate Riemann solver is used for marching between two consecutive time steps. This Riemann solver conveniently …


Numerical Study Of Forced Air Cooling Of A Heated Porous Foam Pyramid Array, Kevin Anderson, Maryann Shafahi, Alfredo Gutierrez, Watit Pakdee Jun 2014

Numerical Study Of Forced Air Cooling Of A Heated Porous Foam Pyramid Array, Kevin Anderson, Maryann Shafahi, Alfredo Gutierrez, Watit Pakdee

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

The current study employs CFD to study the forced air cooling of a pyramid shaped porous foam absorber. Herein, a three by three (3×3) array of porous foam absorbers heated with an external heat flux is modeled using the differential equations governing heat and fluid flow through porous media based on the Brinkman-Darcy flow equations and an effective thermal conductivity to account for the porous medium. The numerical simulations are carried out using the COMSOL commercial Computational Fluid Dynamics (CFD) Finite Element based software package. The primary finding of our study is that the more porous the foam absorber media …


Numerical Simulation Of 3-D Free Convection In Porous Media Due To Combined Surface Forced Convection And Internal Heat Generation, Kevin Anderson, Maryann Shafahi, Shawn Mcgann, Watit Pakdee Jun 2014

Numerical Simulation Of 3-D Free Convection In Porous Media Due To Combined Surface Forced Convection And Internal Heat Generation, Kevin Anderson, Maryann Shafahi, Shawn Mcgann, Watit Pakdee

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

A three-dimensional fluid-saturated porous medium model for natural convective flow has been developed, taking into account inertial and viscous forces within the fluid. The model consists of a cube with a top surface partially exposed to a steady, uniform convective heat flux and the entire domain to uniform internal heat generation. The differential equations for the Brinkman-extended Darcy model were formulated and non-dimensionalized, with numerical solutions obtained using the Galerkin finite element method. The results have been validated by comparison with previously published reports. It has been observed that the applied boundary conditions result in a central toroidal vortex driven …


Application Of Nanoparticles-Assembled Bi-Porous Structures To Power Electronics Cooling, Kazuhisa Yuki, Tessai Sugiura, Koichi Suzuki Jun 2014

Application Of Nanoparticles-Assembled Bi-Porous Structures To Power Electronics Cooling, Kazuhisa Yuki, Tessai Sugiura, Koichi Suzuki

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

Nanoparticles-assembled bi-porous structure is newly proposed and its potential to enhance the boiling heat transfer is evaluated in order to develop a new cooling device toward 300W/cm2 of on-vehicle inverter cooling. In order to assemble nanoparticles on to a heat transfer surface as a thin layer, a boiling adhesion method (BAM) is originally introduced in which, water or water/ethanol solution with mono-dispersed nanoparticles is dropped or sprayed onto a high temperature surface, and then the nanoparticles deposit onto the heat transfer surface during the boiling. In addition to that, it is expected that boiling bubbles can produce micro or milli …


Three Dimensional Flow In A Sphere-Packed Pipe By Digital Holographic Ptv And Numerical Simultation, Shin-Ichi Satake, Yusuke Aoyagi, Takuma Tsuda, Noriyuki Unno, Kazuhisa Yuki Jun 2014

Three Dimensional Flow In A Sphere-Packed Pipe By Digital Holographic Ptv And Numerical Simultation, Shin-Ichi Satake, Yusuke Aoyagi, Takuma Tsuda, Noriyuki Unno, Kazuhisa Yuki

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

In present study, high time-resolution flow field measurement in a sphere-packed pipe (SPP) is performed by the digital-holographic particle-tracking velocimetry. The visualization technique is carried out by a refractive index-matching method using a sodium iodide (NaI) solution employed as a working fluid. Hologram fringe images of particles behind the spheres can be observed, and the particles’ positions can be reconstructed by a digital hologram. Consequently, 3-D velocity-fields around the spheres are obtained by the reconstructed particles’ positions. In addition, numerical simulation of a sphere-packed pipe flow with Immersed Boundary technique is carried out to compare with the experimental value. In …


An Approximate Solution Of Fokker-Planck Equation For One Dimensional Groundwater Recharge Through Porous Media, Kajal Patel, Manoj Mehta, Twinkle Singh Jun 2014

An Approximate Solution Of Fokker-Planck Equation For One Dimensional Groundwater Recharge Through Porous Media, Kajal Patel, Manoj Mehta, Twinkle Singh

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

The nonlinear Fokker-Planck equation arising for one-dimensional groundwater recharge through porous media, is in the form of partial differential equation which has been solved by using Homotopy Analysis method with the help of first approximate solution ()0,ZTθfor given auxiliary parameter 0q=. The solution is physically interpreted and concluded that during one-dimensional recharge through unsaturated porous media, the moisture content of the soil is parabolically increasing as depth Z increases for given0T>. The graph of the solution is given by using Maple coding.


The Velocity Distribution In A Random Porous Medium, Maciej Matyka, Zbigniew Koza, Jaroslaw Golembiewski Jun 2014

The Velocity Distribution In A Random Porous Medium, Maciej Matyka, Zbigniew Koza, Jaroslaw Golembiewski

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

We investigate the velocity distribution function of the fluid flow through a model of random porous media. We examine how the form of the distribution changes with porosity. We find a crossover porosity at which the scaling character of the distribution changes and discuss our findings in the context of a nearly exponential velocity distribution function measured recently experimentally [Datta, S.S. et al. (2013) Phys. Rev. Lett. 111: 064501].


Experimental Study Of Water Retention Properties Of A High Performance Concrete With Small Sliced Samples, Qier Wu, Thomas Rougelot, Nicolas Burlion, Xavier Bourbon Jun 2014

Experimental Study Of Water Retention Properties Of A High Performance Concrete With Small Sliced Samples, Qier Wu, Thomas Rougelot, Nicolas Burlion, Xavier Bourbon

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

No abstract provided.