Mechanical Engineering Commons^™

Assessment Of The Wear Effects Of Alumina-Nanofluids On Heat-Exchanger Materials, Fnu Aktaruzzaman

College of Graduate Studies: Theses & Dissertations

Nanofluids are nano-size-powder suspensions in liquids that are mainly studied for their abnormal thermal transport properties, and hence as enhanced alternatives to ordinary cooling fluids. The tribological effects of nanofluids are, however, largely unknown, in particular their likely wear and/or erosion effects, because of their interaction with cooling-system (heat-exchanger) materials. The thesis presents research to establish methodologies for testing and evaluating surface-change by nanofluid impact. The work is presented on development of novel test rigs and testing methodologies, and on the use of typical surface analysis tools for assessment of wear and erosion that may be produced by nanofluids; prediction …

Effect Of Appointment Schedules On The Operational Performance Of A University Medical Clinic, Arunn Pisharody Vijayan

LSU Master's Theses

Healthcare costs in the United States are one of the highest in the world. The healthcare expenditure alone accounted for 17.9% of the Gross Domestic Product of US in 2011. The National Healthcare Expenditure (NHE) is expected to increase at an annual rate of 6.6% from $ 2.6 Trillion in 2010 to $ 4.5 Trillion in 2019. The per capita expenditure for hospital outpatients and physicians has been the highest among other hospital expenses. This escalation in expenses created a need for productivity improvements in the healthcare industry to control costs. Some of the common problems encountered in outpatient clinics …

Exploration Of Segmented Flow In Microchannels Using The Volume Of Fluid Method In Ansys Fluent, Jace Michael Boudreaux

LSU Master's Theses

Segmented flow can be utilized in lab-on-a-chip technologies to speed up chemical and biological analysis. Segmented flow (also known as Taylor flow or the Bretherton problem) has often been explored in circular channels, but rectangular channels are more common for microfluidics applications. To this end, pressure-driven droplet flow in a square microchannel is studied using the volume of fluid method in ANSYS Fluent, a computational fluid dynamics program. It was found that for low Reynolds number (Re_t = 0.01) and droplet sizes larger than the channel diameter, the flow is mostly influenced by capillary number and viscosity ratio. The …

Experimental Study Of A Cascade Of Low Pressure Turbine Blades With Upstream Periodic Stator Wakes, Carlos Rene Gonzalez Rodriguez

LSU Master's Theses

The objective of this study is to experimentally study film cooling flows. A closed-loop wind tunnel with a four passage linear cascade of US Air Force Research Laboratory (AFRL) ultra-high-lift L1A low pressure turbine (LPT) blades and upstream wake generator is used in conjunction with Particle Image Velocimetry (PIV) flow visualization technique to study turbulent film cooling flows due to the interaction between vanes and blades. Further post-processing in the form of Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD) modal analyses is performed to determine the relevant modes that characterize the coherent structures in the flow. An image …

Radiation Heat Transfer In A Particulate Medium Using A Ray Tracing Method, Manish B. Patil

LSU Master's Theses

In the present work, a complete 3D simulation of ray tracing model is developed for studying the radiation heat transfer, associated with laser based additive manufacturing, in both thick and thin particulate beds by using the Monte Carlo method. Additional program is developed for creating different types of packing structures such as simple cubic, rhombohydral and random packing. The scattering mechanisms in the particulate beds for large opaque spheres are evaluated using the specular and diffuse reflection methods. Further, a novel approach has been added to the model to include isotropic, forward and backward scattering mechanisms for a medium which …

Development Of A Three-Dimensional Bioprinter With Inline Light Activation For Bone Tissue Engineering, Colton Alexander Mcelheny

LSU Master's Theses

Bioprinting offers exciting possibilities for tissue engineering related to tissue and organ failure due to trauma, disease, or aging. This is of substantial societal value as the world populace mean age rises. Current needs for tissue and organ repair far exceed availability. A strategy being explored to counter this imbalance is the single step fabrication of cellular constructs. This paper explores various bioprinting techniques and suggests a custom design for a cost-effective, low-maintenance bioprinting platform for academic research. The platform functionality was validated via two-dimensional image transfer and simple three-dimensional geometries.

A Comparative Assessment Of Ergonomic Risk Factors In University Personnel Using Rula And Reba Aiming To Study The Cause And Effect Relationship, Nabila Chowdhury

LSU Master's Theses

The aim of this research was to conduct an ergonomic assessment of working postures and the design of computer workstations of the employees in Louisiana State University. The purpose of the study was threefold- (1) to determine the major ergonomic issues in university employees while working on computer workstations, (2) to compare the two ergonomic assessment tools (RULA and REBA) to see how similarly or differently they assess the risks present in the same working condition and (3) to develop a model that correlates between working condition, work posture and computer workstation design with their effects on musculoskeletal system. This …

Morphology Of Brain Sulci Trabeculae And Its Effect On Brain During Impacts, Sharlin Anwar

Dissertations and Theses

Traumatic brain injury (TBI) is an intracranial injury caused by direct contact or non-contact head impacts to the brain. TBI is a major problem that accounts for high incidents of hospitalizations each year. Thus, it is important to understand and predict the occurrence of TBI in an impact. It has been shown that the subarachnoid space (SAS) trabeculae play an important role in damping the effect of an impact, thus reducing the injuries. However, the influence of sulci parameters and the sulci trabeculae in TBI due to impact is unexplored. Studies have shown that inclusion of sulci in brain models …

On The Role Of Surface Roughness In Elastohydrodynamic Lubrication Of Tribological Components, Mohammad Masjedi

LSU Doctoral Dissertations

The present dissertation investigates the effect of surface roughness in the elastohydrodynamic lubrication (EHL). Since many essential components of the machinery such as gears, rolling element bearings, cam-followers, and heavily loaded journal bearings operate under the mixed EHL condition, and given the fact that nearly all engineering surfaces are rough to some extent, there is a need for an extensive research which can realistically quantify the effect of the surface roughness in such applications. We thus seek to develop an applied engineering approach for the treatment of the mixed EHL for prediction of the performance of machinery. Both line-contact and …

Test 2130: John Deere 8345r, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Nebraska Summary: S990a Massey Ferguson 8730, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Deposition And Characterization Of Ceramic Thin Films And A New Experimental Approach To Evaluate The Mechanical Integrity Of Film/Substrate Interfacial Layers, Yang Mu

LSU Doctoral Dissertations

Due to their corrosion resistance, high temperature stability, high strength, and high hardness, refractory ceramic thin films and coatings have been utilized for surface engineering of mechanical components and mechanical fabrication tools. Adhesion between ceramic thin films and coatings and the substrate is of critical concern for performance and life time of coated systems. In this dissertation, a custom designed and constructed ultra-high-vacuum (UHV) vapor phase deposition system was used for the preparation of ceramic thin films through low-pressure high-density plasma assisted physical vapor deposition (PVD) methods. Deposited thin films were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), …

Predictive Methods For End Of Life Prognosis In Composites, Vamsee Vadlamudi

Theses and Dissertations

The long-term properties of continuous fiber reinforced composite materials are increasingly important as applications in airplanes, cars, and other safety critical structures are growing rapidly. The mechanical, electrical, and thermal properties of composite materials are altered by the initiation and accumulation of discrete fracture events whose distribution and eventual interaction defines the limits of design, such as strength and life. There is a correlation that exists between the long term behavior of those materials under combined mechanical, thermal, and electrical fields, and the functional properties and characteristics of the composite materials that requires a fundamental understanding of the material state …

Simulating Energy Efficient Control Of Multiple-Compressor Compressed Air Systems, Sean Murphy, J. Kelly Kissock

Mechanical and Aerospace Engineering Faculty Publications

In many industrial facilities it is common for more than one air compressor to be operating simultaneously to meet the compressed air demand. The individual compressor set-points and how these compressors interact and respond to the facility demand have a significant impact on the compressed air system total power consumption and efficiency. In the past, compressors were staged by cascading the pressure band of each compressor in the system. Modern automatic sequencers now allow more intelligent and efficient staging of air compressors.

AirSim, a compressed air simulation tool, is now able to simulate multiple-compressor systems with pressure band and automatic …

Proceedings Of The 15th Annual Early Career Technical Conference (Front Matter), Ectc Coordinating Committee

Early Career Technical Journal (ECTJ)

Proceedings of the 15th Annual Early Career Technical Conference, November 7, 2015. School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama; pp. i-x

Section 1: Bio-Medical/Bioengineering, Ectc Coordinating Committee

Early Career Technical Journal (ECTJ)

Proceedings of the 15th Annual Early Career Technical Conference, November 7, 2015. School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama; pp. 1-36

Section 3: Dynamic Systems & Control, Ectc Coordinating Committee

Early Career Technical Journal (ECTJ)

Proceedings of the 15th Annual Early Career Technical Conference, November 7, 2015. School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama; pp. 65-106

Section 5: Numerical Methods, Ectc Coordinating Committee

Early Career Technical Journal (ECTJ)

Proceedings of the 15th Annual Early Career Technical Conference, November 7, 2015. School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama; pp. 151-165

Analysis Of Strain Distribution On Several Parts Of Human Lung During Mechanical Ventilation Breathing, Israr Bin M Ibrahim, Parya Aghasafari, Ramana Pidaparti

Early Career Technical Journal (ECTJ)

Section 1: Bio-Medical/Bioengineering; pp. 3-9

Proceedings Of The 15th Annual Early Career Technical Conference (Complete Issue), Ectc Coordinating Committee

Early Career Technical Journal (ECTJ)

Proceedings of the 15th Annual Early Career Technical Conference, November 7, 2015. School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama

Feasibility Study Of Substituting The Ffr Invasive Procedure With Cfd Analysis For Assessment Of Human Coronary Artery Stenosis, Mohamed M. Selim, Ankur Gupta

Early Career Technical Journal (ECTJ)

Section 1: Bio-Medical/Bioengineering; pp. 10-16

A Millimeter-Wave Printed Antenna At 35 Ghz For Biomedical Applications, Vinhson La, Saeed I. Latif, David A. Nelson

Early Career Technical Journal (ECTJ)

Section 1: Bio-Medical/Bioengineering; pp. 17-21

Airflow Characteristics In Adult Upper 9 Generations Of Lung Model And Airway Changing (Aging) Effect Under Ventilated Breathing, Jongwon Kim, Ramana Pidaparti, Rebecca L. Heise, Angela M. Reynolds

Early Career Technical Journal (ECTJ)

Section 1: Bio-Medical/Bioengineering; pp. 22-27

Pultruded Glass-Graphite/Epoxy Hybrid Composites Subjected To Transverse High Strain-Rate Compression Loading, Muhammad Afrough, Tejas S. Pandya

Early Career Technical Journal (ECTJ)

Section 2: Materials, Design & Manufacturing; pp. 39-43

Ksu Autonomous Go-Kart Frame, Andrew Geiman, Kevin Mcfall

Early Career Technical Journal (ECTJ)

Section 2: Materials, Design & Manufacturing; pp. 44-51

Section 4: Heat Transfer, Energy Generation & Conversion, Ectc Coordinating Committee

Early Career Technical Journal (ECTJ)

Proceedings of the 15th Annual Early Career Technical Conference, November 7, 2015. School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama; pp. 107-150

Azi-Drive: A Novel Thruster Mapper For Twin Propeller Maritime Vessels, Andrew Gray, Kevin French, Jacob Panikulam, Zach Goins, Eric Schwartz

Early Career Technical Journal (ECTJ)

Section 2: Materials, Design & Manufacturing; pp. 52-57

On-Machine Measurement Of Cutting Tool Damage Based On Optical Knife-Edge Diffraction, Chabum Lee, Kwun-Lon Ting, Joshua A. Tarbutton, Sun-Kyu Lee, Hwan-Sik Yoon, Jonathan D. Ellis

Early Career Technical Journal (ECTJ)

Section 2: Materials, Design & Manufacturing; pp. 58-63

Orbital Mechanic Simulation Of A 1u Cubesat, Alicia Ratcliffe, Carlos Montalvo

Early Career Technical Journal (ECTJ)

Section 3: Dynamic Systems & Control; pp. 67-71

Dynamic System Analysis Using Recurrence Quantification Analysis And Recurrence Plots In Mathematica, Serkan Guldal, Veronica Baugh

Early Career Technical Journal (ECTJ)

Section 3: Dynamic Systems & Control; pp. 76-81