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The Development And Numerical Modelling Of A Representative Elemental Volume For Packed Sand, Ashraf Thabet 2017 The University of Western Ontario

The Development And Numerical Modelling Of A Representative Elemental Volume For Packed Sand, Ashraf Thabet

Electronic Thesis and Dissertation Repository

The motivation of this thesis is the development of simple microscopic-scale model (representative elemental volume; REV) that can be used to conduct flow and heat transfer simulations from which closure coefficients can be established for the volume-averaged transport equations for porous media (packed bed). The thesis provides a brief introduction to the computational technique adopted for the geometric generation of the REV (YADE), followed by a parametric study undertaken to reveal the minimum number of particles inside the REV that are required to mimic the appropriate physics. Additional analysis was conducted with the goal of determining the influence of deviation ...


Numerical Simulations Of Two-Phase Flows In The Liquid Solid Circulating Fluidized Bed, Hao Luo 2017 The University of Western Ontario

Numerical Simulations Of Two-Phase Flows In The Liquid Solid Circulating Fluidized Bed, Hao Luo

Electronic Thesis and Dissertation Repository

The liquid-solid circulating fluidized bed (LSCFB) has many potential applications in biochemical and petroleum industries, as well as in wastewater treatments, given its higher contact efficiency and being able to accommodate two reactions under one system. With extensive experimental results becoming available, there is clearly a need for computational fluid dynamics (CFD) modeling to expand our understandings of LSCFBs and to predict the hydrodynamic behaviors of the two-phase flows within LSCFB.

In this research, the Eulerian-Eulerian two-phase model combined with the kinetic theory for the granular phase is applied to simulate the two-phase flows in LSCFBs. The key factors affecting ...


Experimental Measurements Of Far Field Cough Airflows Produced By Healthy And Influenza- Infected Human Subjects, Ahmed Faraj Alarbi Mohamed 2017 The University of Western Ontario

Experimental Measurements Of Far Field Cough Airflows Produced By Healthy And Influenza- Infected Human Subjects, Ahmed Faraj Alarbi Mohamed

Electronic Thesis and Dissertation Repository

The present work details an experimental study of the cough airflow fields produced by subjects infected with influenza and when they are convalescent, together with data from healthy cohorts. The PIV and HWA measurements were taken far downstream at 1 m from the source within a cough chamber, along with droplet sampling at two different locations and nasal swabs from the sick subjects. The measured data over different seasons were used to evaluate and compare the results from sick, convalescent and healthy subjects. Although a total of 8 sick participants from winter 2014 and 2017 yielded positive nasal swab analysis ...


Software For Extracting Deformation Gradient And Stress From Md Simulations: Simulations Using The Charmm Force Field, Mehrdad Negahban, Lili Zhang, Zesheng Zhang, John Jasa, Antoine Jérusalem 2017 University of Nebraska - Lincoln

Software For Extracting Deformation Gradient And Stress From Md Simulations: Simulations Using The Charmm Force Field, Mehrdad Negahban, Lili Zhang, Zesheng Zhang, John Jasa, Antoine Jérusalem

Mechanical & Materials Engineering Faculty Publications

Software was developed, and is provided under a general use license, to calculate continuum level deformation gradient and stress for any group of atoms in an MD simulation that uses the Charmm force fields. This software can also calculate the interaction stress applied by one group of atoms on any other group. To obtain deformation gradient and stress, the user needs to provide the selected group(s) of atoms in an atom group identification file, and provide the associated LAMMPS format files and force field parameter file. An example is included to demonstrate the use of the software.


Design, Analysis, And Verification Of An Open-Wheeled Formula-Style Race Car Suspension System, Joshua Beckerman 2017 Syracuse University

Design, Analysis, And Verification Of An Open-Wheeled Formula-Style Race Car Suspension System, Joshua Beckerman

Syracuse University Honors Program Capstone Projects

This honors thesis presents the design, measurement, and analysis of an open-wheeled formula racecar suspension system. This racecar is the second iteration of Syracuse University’s Citrus Racing team student competition vehicle. The race car’s suspension system features several designs that enable geometric adjustability to impact the vehicles dynamic performance. The purpose of this research is to find an analytic approach to verifying the correlation between suspension design tunings and their effect on vehicle handling and road holding capacity. This was done by analyzing measured data obtained from a system of damper-mounted travel sensors as the vehicle drives through ...


Development Of Portable Hyperspectral Imaging Device, Chenxi Li, Youngkee Jung, Iyll-Joon Doh, Euiwon Bae 2017 Purdue University, Department of Agricultural and Biological Engineering

Development Of Portable Hyperspectral Imaging Device, Chenxi Li, Youngkee Jung, Iyll-Joon Doh, Euiwon Bae

The Summer Undergraduate Research Fellowship (SURF) Symposium

Most of the conventional hyperspectral imaging devices require sophisticated optical components, occupy a large footprint, and requires an initial capital investment for laboratories which mostly suits for laboratories benchtop system. The requirement of shipping the sample and waiting an extended period of time to get the results are the main downsides of this traditional approach. Capitalize in many specific field applications and diagnosis, portable devices provide both convenience and on-site results which are desirable for government agencies and food safety inspectors. This project was aimed to develop a low-cost, portable hyperspectral device for food safety applications. A smartphone was used ...


Simulating Dynamic Failure Of Polymer-Bonded Explosives Under Periodic Excitation, Rachel Kohler, Camilo Duarte Cordon, Marisol Koslowski 2017 Liberty University

Simulating Dynamic Failure Of Polymer-Bonded Explosives Under Periodic Excitation, Rachel Kohler, Camilo Duarte Cordon, Marisol Koslowski

The Summer Undergraduate Research Fellowship (SURF) Symposium

Accidental mishandling of explosive materials leads to thousands of injuries in the US every year. Understanding the mechanisms behind the detonation process is crucial to prevent such accidents. In polymer-bonded explosives (PBX), high-frequency mechanical excitation generates thermal energy and can lead to an increase in temperature and vapor pressure, and potentially the initiation of the detonation process. However, the mechanisms behind this energy release, such as the effects of dynamic fracture and friction, are not well understood. Experimental data is difficult to collect due to the different time scales of reactions and vibrations, so research is aided by running simulations ...


Image-Based Compression Method Of Three-Dimensional Range Data With Texture, Xia Chen, Tyler Bell, Song Zhang 2017 Purdue University

Image-Based Compression Method Of Three-Dimensional Range Data With Texture, Xia Chen, Tyler Bell, Song Zhang

The Summer Undergraduate Research Fellowship (SURF) Symposium

Recently, high speed and high accuracy three-dimensional (3D) scanning techniques and commercially available 3D scanning devices have made real-time 3D shape measurement and reconstruction possible. The conventional mesh representation of 3D geometry, however, results in large file sizes, causing difficulties for its storage and transmission. Methods for compressing scanned 3D data therefore become desired. This paper proposes a novel compression method which stores 3D range data within the color channels of a regular 2D output image. Our method encodes the 3D range data’s respective normalized phase map, generated by a virtual stereovision system, into two of the output image ...


Analytical Solution Of Microbes Interacting With Surfaces, Junyuan Li, Arezoo M. Ardekani 2017 Purdue University

Analytical Solution Of Microbes Interacting With Surfaces, Junyuan Li, Arezoo M. Ardekani

The Summer Undergraduate Research Fellowship (SURF) Symposium

Nowadays, there is a rising interest in studying the behavior of microbes and their interactions with flow and surfaces. In order to explore the velocity field, pressure and forces around the microbes, the solution of Stokes equations, which is called a Stokeslet, is used. This solution represents a singular velocity field due to a concentrated external force acting on fluid at a single point. This singularity could cause the expression of velocity not integrable. We use the Regularized Stokeslet Method and Method of Images to deal with this problem. The expression of force is replaced by a radially symmetric function ...


The Influence Of Macroscale Stress Concentrations On The Near-Resonant Thermomechanics Of Mock Energetic Materials, Lauren A. Cooper, Allison R. Range, Jeffrey F. Rhoads 2017 Western Kentucky University

The Influence Of Macroscale Stress Concentrations On The Near-Resonant Thermomechanics Of Mock Energetic Materials, Lauren A. Cooper, Allison R. Range, Jeffrey F. Rhoads

The Summer Undergraduate Research Fellowship (SURF) Symposium

The characterization of particulate composite energetic materials, both with and without stress concentration, is currently of great interest to the defense community. This work seeks to further characterize the self-heating effect of composite energetic plates, particularly around regions of high stress, when subjected to harmonic excitation near resonance. Mock energetic plates with macroscale stress concentrations are prepared in various compositions based on the PBXN-109 formulation, and are tested near the first resonant frequency using an electrodynamic shaker. The resulting mechanical and thermal responses are recorded using a laser Doppler vibrometer and an infrared camera, respectively. Upon comparison between the regions ...


Thermoelectric System Modeling And Design, Buddhima Pasindu Gamarachchi 2017 Boise State University

Thermoelectric System Modeling And Design, Buddhima Pasindu Gamarachchi

Boise State University Theses and Dissertations

Thermoelectric generators (TEGs) convert heat to electricity by way of the Seebeck effect. TEGs have no moving parts and are environmentally friendly and can be implemented with systems to recover waste heat. This work examines complete thermoelectric systems, which include the (TEG) and heat exchangers or heat sinks attached to the hot and cold sides of the TEG to maintain the required temperature difference across the TEG. A 1-D steady state model is developed to predict the performance of a TEG given the required temperatures and device dimensions. The model is first validated using a 3-D model and then is ...


A Study In The Use Of Elastic Materials In Expandable Containment Units, Andrew J. Eisenman, Joby Anthony III, David Satagaj 2017 Liberty University

A Study In The Use Of Elastic Materials In Expandable Containment Units, Andrew J. Eisenman, Joby Anthony Iii, David Satagaj

Montview Liberty University Journal of Undergraduate Research

The rigidity of materials in conjunction with the aspect of elasticity has been a concern of modern technologies and construction in recent centuries because of the advantages that expandable storage would bring to the fields of containment units with respect to population growth and space exploration. The world population is currently growing at an exponential rate, and as our population grows, the more important it will become to have containment units that can both contain large volumes of material as well as minuscule amounts of material without wasting space. In order accomplish this, we will need a new type of ...


Multiple Scattering Theory For Heterogeneous Elastic Continua With Strong Property Fluctuation: Theoretical Fundamentals And Applications, Huijing He 2017 University of Nebraska - Lincoln

Multiple Scattering Theory For Heterogeneous Elastic Continua With Strong Property Fluctuation: Theoretical Fundamentals And Applications, Huijing He

Mechanical & Materials Engineering Faculty Publications

Scattering of elastic waves in heterogeneous media has become one of the most important problems in the field of wave propagation due to its broad applications in seismology, natural resource exploration, ultrasonic nondestructive evaluation and biomedical ultrasound. Nevertheless, it is one of the most challenging problems because of the complicated medium inhomogeneity and the complexity of the elastodynamic equations. A widely accepted model for the propagation and scattering of elastic waves, which properly incorporates the multiple scattering phenomenon and the statistical information of the inhomogeneities is still missing. In this work, the author developed a multiple scattering model for heterogeneous ...


Balancing Of Production Line In A Bearing Industry To Improve Productivity, Sudharsan Sridhar, Balthilak Anandaraj, Santhosh B 2017 Western Michigan University

Balancing Of Production Line In A Bearing Industry To Improve Productivity, Sudharsan Sridhar, Balthilak Anandaraj, Santhosh B

The Hilltop Review

Line balancing addresses the issues of balancing production or assembly line and it generally minimizes the idle time for all the events and the combinations of workstations. Factors such as lack of materials, design changes in the product, labor position may also be needed for line balancing. We approached the industry and proposed a heuristic solution solving in two different platforms, by rearranging the existing tasks over the work stations, so that the idle time of the machines are reduced to minimum and the other is by using Timer Pro software where grouping of similar kind of activities are to ...


Development Of 3d Compression Molded Composite Primary Structure, Sean D. Tischler, Jacob H. Goldstein, Alea A. Perez 2017 California Polytechnic State University, San Luis Obispo

Development Of 3d Compression Molded Composite Primary Structure, Sean D. Tischler, Jacob H. Goldstein, Alea A. Perez

Mechanical Engineering

The work accomplished by the Black Gold team improved upon the carbon fiber compression molding research and information available on the Cal Poly San Luis Obispo campus. The team used the rear suspension rocker arm off a Ventana Alpino mountain bike as a design goal for this project. This research and body of work includes the methods used to design a compression molded part for complex part loading and shape. This extends to the process of choosing an appropriate layup process, in addition to benefits and drawbacks of the use of chopped fibers in compression molding. The research includes the ...


Grey Water Capture, Paul B. Brenneman, Vicente J. Ramirez, Kevin J. Alexander 2017 California Polytechnic State University, San Luis Obispo

Grey Water Capture, Paul B. Brenneman, Vicente J. Ramirez, Kevin J. Alexander

Mechanical Engineering

Many households today do not implement any kind of grey water recycling system. People do not get a grey water system for a variety of reasons; the benefits could be unknown, the uses for grey water could be limited in their specific home, or the economic gain is too minimal to constitute a modification to the house.

For our project, we are going to design an easy to install product that enables the reuse of grey water from household sources. Examples of our final product could be something that lets the customer use grey water from the bathroom sink to ...


Deployable Antenna For Cubesat, Mackenzie Thomas Lennon, Caleb Andrew Barber, David Matthew Galves 2017 California Polytechnic State University, San Luis Obispo

Deployable Antenna For Cubesat, Mackenzie Thomas Lennon, Caleb Andrew Barber, David Matthew Galves

Mechanical Engineering

This project is a proof-of-concept ground model of a large deployable antenna designed for the small space requirements of CubeSats. This small deployment module is designed to fit a 2 m by 1 m reflective antenna inside a storage volume of with the dimensions 20 cm by 20 cm x 40 cm. The reflector will be deployed to a parabolic shape with the goal of modeling the reflector necessary for high frequency communication. Because this module is designed as a proof-of-concept for the deployable parabolic reflector specifically, no electrical components will be incorporated and will just focus on the deployment ...


Swanton Pacific Railroad - Track Maintainer Upgrades, Dustin Platt, Jakob Graf 2017 California Polytechnic State University, San Luis Obispo

Swanton Pacific Railroad - Track Maintainer Upgrades, Dustin Platt, Jakob Graf

Mechanical Engineering

This project’s sponsor is Swanton Pacific Railroad, a 1/3 scale railroad in Santa Cruz, CA. Our team was given the task of upgrading a maintenance cart used to clear debris from the track and level the gravel ballast during maintenance projects. Our focus was to upgrade the blowing system used to clear any debris. The current system used is a hydraulic fan with a single length of ducting serving as its outlet. Our solution is to mount two Stihl backpack leaf blowers to manufactured saddles and mount the assembly to the cart in place of the hydraulic fan ...


Cal Poly Compost Chomper, David Anthony Jungquist, Cory James Parmenter, Joseph Mark McGill 2017 California Polytechnic State University, San Luis Obispo

Cal Poly Compost Chomper, David Anthony Jungquist, Cory James Parmenter, Joseph Mark Mcgill

Mechanical Engineering

The purpose of this final design report is to detail the design, manufacturing, and testing of a bicycle powered compost cutter for use by the Captain Raymond Collin’s Elementary school. Students in the garden program are tired of manually chopping up garden waste into small enough pieces to be composted effectively. Project Sponsor and Master Gardener, Susan Deogracias had the idea to create a pedal powered compost cutter which would save time and improve moral for the aspiring gardeners.

This report details the ideation process the team went through in defining the compost cutting system. Engineering methods are documented ...


Bear Minimum: Ultralight Composite Bear Canister, Rama B. Adajian, Adam C. Eisenbarth 2017 California Polytechnic State University, San Luis Obispo

Bear Minimum: Ultralight Composite Bear Canister, Rama B. Adajian, Adam C. Eisenbarth

Mechanical Engineering

The ultralight backpacking community needs a strong, easy to use, safe bear canister that is lighter than current market products for trekking in the backcountry. A full design of the lid for the bear canister is to be completed. This includes the locking mechanism to ensure it is bear proof, the interface between the lid and the canister, and the structure of the lid so it passes the strength and weight specifications. The lid, along with the already designed canister body, is to be manufactured with formal documentation. The lid will initially be tested separately and then with the canister ...


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