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Mechanical Engineering Commons

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Selected Works

2007

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Articles 1 - 20 of 20

Full-Text Articles in Mechanical Engineering

Laminar Flow In Mini-Fluidics Channels Assembly And Its Application In Zebra Fish Embryo Research, Radek Glaser Dec 2007

Laminar Flow In Mini-Fluidics Channels Assembly And Its Application In Zebra Fish Embryo Research, Radek Glaser

Radek Glaser

A Mini-Fluidics system was designed to facilitate the muscle growth of the Zebra Fish embryos. This experimental device is made of peristaltic pump, inflow/outflow manifolds, fluid storage tank, series of valves and flexible pipes and the main plate with six mini channels. These closed channels provide pathways for an extremely laminar flow. The Zebra Fish embryos are placed in the channels and exposed to the forces present in the fluid.


Experimental Study Of Coal Pyrolysis And Gasification In Association With Syngas Combustion, Wei-Hsin Chen Nov 2007

Experimental Study Of Coal Pyrolysis And Gasification In Association With Syngas Combustion, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Characterization Of Water Gas Shift Reaction In Association With Carbon Dioxide Sequestration, Wei-Hsin Chen Sep 2007

Characterization Of Water Gas Shift Reaction In Association With Carbon Dioxide Sequestration, Wei-Hsin Chen

Wei-Hsin Chen

The characteristics of a water gas shift reaction (WGSR) in association with carbon dioxide sequestration under the effects of a high-temperature catalyst (HTC) and a low-temperature catalyst (LTC) are studied experimentally. With the condition of fixed residence time (0.1 s) for the reactants in the catalyst bed, it is found that the reaction behaviors with the HTC are inherently different from those with the LTC. Specifically, for the WGSR with the HTC, the reaction can be divided into a rapid growth regime, a progressive growth regime and a slow growth regime with increasing reaction temperature or steam/CO ratio ...


Preliminary Model Tests For The Design Of A Gliding Deep Water Elevator, Christopher Roman, T. Gregory, E. Martin, A. Sanguinetti, J. Drummond Aug 2007

Preliminary Model Tests For The Design Of A Gliding Deep Water Elevator, Christopher Roman, T. Gregory, E. Martin, A. Sanguinetti, J. Drummond

Christopher N. Roman

This paper presents progress on the design of a "smart elevator" to be used in conjunction with deep sea ROV operations. Deep sea elevators are gravity driven untethered platforms used to deliver and or return items from the sea floor. Elevators are used when items are too large or heavy to be handled by the ROV, or when the turn around time to recover and redeploy the ROV system for sample removal is prohibitive. Unfortunately, efficiency is complicated by the precision with which elevators can be landed at a specific location on the bottom and recovered on the surface because ...


[Ph.D.] Caractérisation Mécanique De Matériaux Fibreux En Vibro-Acoustique, Olivier Doutres Ph.D. Aug 2007

[Ph.D.] Caractérisation Mécanique De Matériaux Fibreux En Vibro-Acoustique, Olivier Doutres Ph.D.

Olivier Doutres Ph.D.

This work deals with modelization and characterization of the mechanical properties of soft fibrous materials used in aeronautic industries. First, the Biot-Allard model and a simplified model dedicated to soft materials are presented. The simplified model, called limp model, assumes that the frame has no bulk stiffness. Being an equivalent fluid model accounting for the the motion of the frame, it has fewer limitations than the usual equivalent fluid model assuming a rigid frame. A criterion is proposed to identify the porous materials for which the limp model can be used : the use of the Biot model is generally recommended ...


Enhanced Tunable Bragg Diffraction In Large-Pore Inverse Opals Using Dual-Frequency Liquid Crystal, Elton Graugnard, S. N. Dunham, J. S. King, D. Lorang, S. Jain, C. J. Summers Aug 2007

Enhanced Tunable Bragg Diffraction In Large-Pore Inverse Opals Using Dual-Frequency Liquid Crystal, Elton Graugnard, S. N. Dunham, J. S. King, D. Lorang, S. Jain, C. J. Summers

Elton Graugnard

Large-pore TiO2 inverse opals were fabricated by atomic layer deposition in sintered polystyrene colloidal crystal templates and infiltrated with dual-frequency liquid crystal. The optical properties of the hybrid organic/inorganic structure were characterized by reflectance measurements of the Bragg peak, the position of which was tuned using a frequency dependent applied electric field. A 6 nm blueshift was observed for frequencies less than 13 kHz and a 13 nm redshift for frequencies above 13 kHz. These results demonstrate enhanced optical tunability in three-dimensional photonic crystals and are important for the development of active photonic devices.


Volatile Release And Particle Formation Characteristics Of Injected Pulverized Coal In Blast Furnaces, Wei-Hsin Chen Jun 2007

Volatile Release And Particle Formation Characteristics Of Injected Pulverized Coal In Blast Furnaces, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Transient Gasification And Syngas Formation From Coal Particles In A Fixed-Bed Reactor, Wei-Hsin Chen Jun 2007

Transient Gasification And Syngas Formation From Coal Particles In A Fixed-Bed Reactor, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Performances Of Pulverized Coal Injection In Blowpipe And Tuyere At Various Operational Conditions, Wei-Hsin Chen Jun 2007

Performances Of Pulverized Coal Injection In Blowpipe And Tuyere At Various Operational Conditions, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Implementation Of A Mems Laboratory Course With Modular, Multidisciplinary Team Projects, John Lee, Stacy H. Gleixner, Tai-Ran Hsu, David W. Parent Jun 2007

Implementation Of A Mems Laboratory Course With Modular, Multidisciplinary Team Projects, John Lee, Stacy H. Gleixner, Tai-Ran Hsu, David W. Parent

Sang-Joon John Lee

This paper presents the implementation and outcomes of a hands-on laboratory course in microelectromechanical systems (MEMS), co-developed by a multidisciplinary team of faculty from mechanical engineering, electrical engineering, and materials engineering. Central to the design of the course is an emphasis on implementing modules that are able to overcome critical barriers related to (1) diverse academic background from different majors and (2) practical limitations in microfabrication facilities. These points are vital for promoting MEMS education, because they expand the student pool and reach audiences that need a cost-effective way to support instructional laboratory experiences in MEMS without the broader infrastructure ...


Design Of A Gas Tight Water Sampler For Auv Operations, Christopher Roman, R. Camilli May 2007

Design Of A Gas Tight Water Sampler For Auv Operations, Christopher Roman, R. Camilli

Christopher N. Roman

This paper presents the design and preliminary test results for a small gas tight water sampler intended to work on scientific AUVs. In recent years AUVs have developed into reliable platforms capable of carrying a wide variety of environmental sensors for in-situ chemical measurements. Physical sample collection however remains difficult, due to the combination of space, power and complexity constraints inherent in working with autonomous platforms. The AUV sampler is a small (12 cm times 85 cm) cylindrical package designed to collect eight 20 ml gas tight volumes of water, with each sample maintained at high pressure to depths of ...


Design And Characteristics Of A Split Hopkinson Pressure Bar Apparatus, Radek Glaser, Jesse Haines, Christopher Knight May 2007

Design And Characteristics Of A Split Hopkinson Pressure Bar Apparatus, Radek Glaser, Jesse Haines, Christopher Knight

Radek Glaser

A Split Hopkinson Pressure Bar Apparatus, also known as Kolsky Bar that is capable of conducting compressive strain rate testing in the approximate ranges from 50 to 10^4 in/in per second was designed as a part of a Senior Design Project. Generally, this device is similar to that first used by Kolsky in 1949. The design of this device is presented here in two stages: 1. Research, design and manufacturing of the Stress Generating System 2. Experimental Part – Testing of the apparatus to obtain necessary data. The present phase of the design was focused mostly on the stress ...


A Simplified Model Of Predicting Coal Reaction In A Partial Oxidation Environment, Wei-Hsin Chen Apr 2007

A Simplified Model Of Predicting Coal Reaction In A Partial Oxidation Environment, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Derivation And Application Of A Conserved Orbital Energy For The Inverted Pendulum Bipedal Walking Model, Jerry E. Pratt, Sergey V. Drakunov Mar 2007

Derivation And Application Of A Conserved Orbital Energy For The Inverted Pendulum Bipedal Walking Model, Jerry E. Pratt, Sergey V. Drakunov

Sergey V. Drakunov

We present an analysis of a point mass, point foot, planar inverted pendulum model for bipedal walking. Using this model, we derive expressions for a conserved quantity, the “Orbital Energy”, given a smooth Center of Mass trajectory. Given a closed form Center of Mass Trajectory, the equation for the Orbital Energy is a closed form expression except for an integral term, which we show to be the first moment of area under the Center of Mass path. Hence, given a Center of Mass trajectory, it is straightforward and computationally simple to compute phase portraits for the system. In fact, for ...


Modeling Of The Semi-Solid Material Behavior And Analysis Of Micro-/Mesoscale Feature Forming, Gap-Yong Kim, Muammer Koc, Rhet Mayor, Jun Ni Mar 2007

Modeling Of The Semi-Solid Material Behavior And Analysis Of Micro-/Mesoscale Feature Forming, Gap-Yong Kim, Muammer Koc, Rhet Mayor, Jun Ni

Gap-Yong Kim

One of the major challenges in simulation of semi-solid forming is characterizing the complex behavior of a material that consists of both solid and liquid phases. In this study, a material model for an A356 alloy in a semi-solid state has been developed for high solid fractions (>0.6) and implemented into a finite element simulation tool to investigate the micro-/mesoscale feature formation during the forming process. Compared to previous stress models, which are limited to expressing the stress dependency on only the strain rate and the temperature (or the solid fraction), the proposed stress model adds the capability ...


Design And Development Of Sand Bed Filter For Upgrading Producer Gas To Ic Engine Quality Fuel, B. S. Pathak, D. V. Kapatel, Prakash Bhoi, Ashokkumar M. Sharma, D. K. Vyas Feb 2007

Design And Development Of Sand Bed Filter For Upgrading Producer Gas To Ic Engine Quality Fuel, B. S. Pathak, D. V. Kapatel, Prakash Bhoi, Ashokkumar M. Sharma, D. K. Vyas

Prakash Bhoi

Engine quality producer gas must be almost free of solid particulate matters (SPM) and organic contaminants (Tar) to minimize engine wear and maintenance. Except for the catalytic tar crackers, none of the gas cleaning systems commercially available can securely meet a tar removal exceeding 90 % and hence new concepts for tar removal are required. This paper presents a design and development work of sand filter for upgrading producer gas to IC engine quality fuel. The developed sand filter was tested for its performance with SPRERI’S 20 kWe down draft circular throat type gasifier with engine set up. The experimental ...


Extinction Of Counterflow Diffusion Flames With Radiative Heat Loss And Nonunity Lewis Numbers, Wei-Hsin Chen Jan 2007

Extinction Of Counterflow Diffusion Flames With Radiative Heat Loss And Nonunity Lewis Numbers, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Enhancing Design Learning Using Groupware, Andrew Wodehouse, Ozgur Eris, Hillary Grierson, Ade Mabogunje Dec 2006

Enhancing Design Learning Using Groupware, Andrew Wodehouse, Ozgur Eris, Hillary Grierson, Ade Mabogunje

Ozgur Eris

Project work is increasingly used to help engineering students integrate, apply and expand on knowledge gained from theoretical classes in their curriculum and expose students to `real world' tasks. To help facilitate this process, the department of Design, Manufacture and Engineering Management at the University of Strathclyde has developed a web-based groupware product called LauLima to help students store, share, structure and apply information when they are working in design teams. This paper describes a distributed design project class in which LauLima has been deployed in accordance with a Design Knowledge Framework that describes how design knowledge is generated and ...


Mechanochemical Mechanism For Fast Reaction Of Metastable Intermolecular Composites Based On Dispersion Of Liquid Metal, Valery I. Levitas, Blaine W. Asay, Steven F. Son, Michelle Pantoya Dec 2006

Mechanochemical Mechanism For Fast Reaction Of Metastable Intermolecular Composites Based On Dispersion Of Liquid Metal, Valery I. Levitas, Blaine W. Asay, Steven F. Son, Michelle Pantoya

Steven F. Son

An unexpected mechanism for fast reaction of Alnanoparticles covered by a thin oxide shell during fast heating is proposed and justified theoretically and experimentally. For nanoparticles, the melting of Al occurs before the oxide fracture. The volume change due to melting induces pressures of 1–2 GPa and causes dynamic spallation of the shell. The unbalanced pressure between the Al core and the exposed surface creates an unloading wave with high tensile pressures resulting in dispersion of atomic scale liquid Al clusters. These clusters fly at high velocity and their reaction is not limited by diffusion (this is the opposite ...


Effect Of Crosslinking And Pt-Zr Quasicrystal Fillers On The Mechanical Properties And Wear Resistance Of Uhmwpe For Use In Artificial Joints, Christian J. Schwartz, Shyam Bahadur, Surya K. Mallapragada Dec 2006

Effect Of Crosslinking And Pt-Zr Quasicrystal Fillers On The Mechanical Properties And Wear Resistance Of Uhmwpe For Use In Artificial Joints, Christian J. Schwartz, Shyam Bahadur, Surya K. Mallapragada

Surya K. Mallapragada

The use of artificial joints is common for restoration of comfort and functionality in joints that have been afflicted with cartilage loss due to disease or injury.  These implants incorporate an articulating interface of ultra-high molecular weight polyethylene (UHMWPE) sliding against a polished metallic counterface such as 316L stainless steel.  While the design of these joints has been refined over several decades, there are still significant limitations to their pain-free lifetime due to osteolysis induced by UHMWPE particulate.  Crosslinking has been used recently to increase the wear resistance of the polymer, but there are significant tradeoffs involving reduced elastic modulus ...