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Mechanical Engineering Seminars

  •  ME Winter Seminar - 2/2614

    You are cordially invited to the Mechanical Department Seminar Series

    Speaker: Sathish Manickam
    Date: Wednesday, February 26, 2014
    Location: Bannan Hall 142 (Law Building)
    Time: 12:00 p.m. - 1:00 p.m.


    Mechanistic Modeling of Pool Boiling Heat Transfer

    Experiments Heat Transfer to a Sliding Vapor Bubble

     

    Sathish Manickam, PhD

     

    Abstract

     

    Boiling is a complex and technologically relevant yet commonly observed natural process involving change of phase of matter from liquid to vapor by creation of vapor bubbles on heated surfaces. High rate of heat transfer observed during boiling makes it ideally suitable for applications ranging from power generation to electronics cooling. Much effort has been made to understand the process, and to develop correlations for use in design. However due to the complex nature of the process, many of them are empirical in nature, offering only limited insights into the nature and help in unknown design situations. Such observations have led studies in the past two decades to focus more on the mechanism of boiling and to develop correlations based on fundamental heat transfer mechanisms associated with the process. This talk presents a broad outline of such mechanistic models for boiling, and discusses in particular experiments related to heat transfer measurements on a sliding vapor bubble, a commonly encountered sub-process during boiling.

     

    BioSketch

    Sathish Manickam obtained his PhD in Mechanical Engineering, specializing in boiling and two-phase flow heat transfer, under Prof. Vijay Dhir at University of California Los Angeles (UCLA). He has also done Post doctoral work at UCLA on film boiling and at the Stanford University School of Medicine on development of biomaterials and novel drug delivery systems. Prior to his graduate studies, he worked at the Indian Institute of Science, Bangalore, a premier graduate research institution in India, for about ten years on research areas including HVAC, Food Precooling and Alternate Energy Systems. Currently he is working on early stage development of a biomedical startup in the Bay Area. Beginning Spring 2014, he will also be an Adjunct Faculty at the Mechanical Engineering Department at SCU.
  •  ME Winter Seminar - 2/1914

    You are cordially invited to the Mechanical Department Seminar Series

    Speaker: Yasdani P. Razi

    Date: Wednesday, February 19, 2014

    Location: Bannan Hall 142 (Law Building)

    Time: 12:00 p.m. - 1:00 p.m.

     

     

     

    An Introduction to Smart Home

     Abstract:

     

    A Smart home is defined as a 'building' where various devices, equipment, and products can be monitored and controlled through the application of smart mobile devices. This includes the control of lighting, heating, cooling, consumer electronics, safety, smoke and hazardous gases.

    In this talk, an introduction to Smart Home will be given. Different aspects of Smart Home will be explored. Then some of the experiments conducted on it will be discussed. These experiments were conducted during summer of 2013 and temperature variations were measured. Natural and forced convection aspects will be explored. Also material radiative properties are examined. Different design aspects will be presented. In the end, other experimental equipment in this context will be introduced  

     

    Biosketch:

     

    Dr Yazdan P. Razi is an Associate Professor in Silicon Valley University, San Jose USA. Previously he was Assistant Professor at Paul Sabatier University in Toulouse, France. He is the author of more than 30 research papers and book chapters on heat transfer. He is one of the pioneers of thermo-vibrational convection in fluid and porous media.

    He was Sr. Thermal engineering manager at Flextronics International where he was responsible for thermal simulations and testing of power supplies ranging from 4W to 1400W. He was also is thermo-mechanical engineering manager in camera modules division in Tessera Company focusing on the thermo-deformation aspects of lens design.

    He also specializes in geometric optimization method, constructal theory, heat transfer enhancement in natural and forced convection, thermal stability analysis in fluid and porous media with industrial applications, TIM (thermal interface materials) selection and testing. He is currently Thermal Engineering Consultant at Xicato Company focusing on thermal management of LED modules.

     

  •  ME Winter Seminar - 2/1214

    You are cordially invited to the Mechanical Department Seminar Series

    Speaker: Kedar Hardikar
    Date: Wednesday, February 12, 2014
    Location: Bannan Hall 142 (Law Building)
    Time: 12:00 p.m. - 1:00 p.m.

    TITLE:
     
    ESTABLISHING LONG TERM RELIABILITY OF THE EDGE SEAL IN PV MODULES FOR ITS MOISTURE BARRIER PERFORMANCE

    ABSTRACT:
    A critical failure mechanism of PV modules is the degradation in performance as a result of exposure to temperature and humidity during typical product life of over 25 years. The time to failure of a PV module under given field conditions attributable to moisture ingress involves multiple factors including encapsulant and edge seal moisture barrier performance as well as the degradation rate of particular solar cells when exposed to moisture. The work presented is aimed at establishing a conservative estimate of field lifetime by examining the time to breakthrough of moisture across the edge seal. Establishing a lifetime model for the edge seal independent of the characteristics of the encapsulant and solar cells facilitates design optimization of the cells and encapsulant.  A novel test configuration is proposed for accelerated testing of edge seal materials in standard temperature-humidity controlled chambers that is amenable to varying dimensions of the edge seal and decoupled from encapsulated components. A theoretical framework is
    developed to analyze moisture ingress performance of edge seal accounting for the presence of desiccants. An approach to analyzing test data from accelerated testing is developed that incorporates temperature dependence of material properties of the edge seal. Proposed equations and functional forms have been validated by demonstrating fits to experimental test data.
    These functional forms and equations allow prediction of edge seal performance in field conditions characterized by historical meteorological data. In the specific case of the edge seal used in certain MiaSole glass-glass modules, this work has established that the edge seal can prevent moisture ingress well beyond the intended service life in the most aggressive climate conditions evaluated.

    SPEAKER BIOGRAPHY:
    Kedar Hardikar is a Staff Scientist at MiaSole and an adjunct faculty member at San Jose State University and Santa Clara University. Kedar holds a Ph.D from the Division of Engineering, Brown University. His roles at MiaSole include assisting product development, improving reliability of the product and leading selected research and development projects using analysis and computational models. Kedar has held several key positions over more than 10 years in semiconductor capital equipment industry and consumer electronics industry before joining MiaSole.
  •  ME Winter Seminar - 1/29/14

     

    You are cordially invited to the Mechanical Department Seminar Series

    Speaker: Daniel White
    Date: Wednesday, January 29, 2014

    Location: Bannan Hall 142 (Law Building)
    Time: 12:00 p.m. - 1:00 p.m.

    Title:

    Frontiers of In-Space Propulsion

    Abstract:

    Space propulsion refers to the application of propulsive forces required for orbit maintenance, station-keeping and deep-space maneuvers on vehicles outside planetary atmospheres. A broad range of flight proven systems and engineering concepts exist to provide this function. This survey presentation will cover the current state-of-the-art for in-space propulsion, including both chemical and electric propulsion systems, and explore some of the current hardware development efforts for near-term future applications. Some additional medium- and far-term concepts will be outlined, including discussion of their utility in furthering human exploration of the solar system and beyond.

    Bio:

    Daniel White has a background in the fields of electrical and aerospace engineering. He completed his BS at Texas A&M University in Electrical Engineering in 2006, and his MS and Ph. D. degrees in Aerospace Engineering at MIT in 2008 & 2011 respectively. Daniel has worked in the aerospace and defense industry for approximately 7 years. He has worked for Defense contractor Lockheed Martin, as well as in the commercial sector for Space Systems / Loral on commercial spacecraft electric propulsion systems.

  •  Winter Seminar: Monday, March 11, 2013

    Nanoscale strain engineering for energy

    Marina S. Leite

    CNST, National Institute for Standard and Technologies

    Maryland Nanocenter, University of Maryland

    Date: Monday, March 11th                Location: Bannan Hall 238                            Time: 4:00 ? 5:00

    ABSTRACT: The ability of controlling strain at the nanoscale governs numerous materials? properties, from structural morphology of solid-state batteries to band gap engineering for photovoltaic devices. Depending on the mechanical strain between a substrate and an epitaxially grown material, different morphologies can be achieved ranging from strained planar films to 3-dimensional nanocrystals. In this talk, I will discuss how strained nanoarchitectures can be used for improved energy generation and storage applications. First, I will discuss the driving forces for alloying in quasi-equilibrium Ge-Si nanocrystals, which results primarily from entropy. I will describe experiments in which we tailored adatoms diffusion mechanisms to achieve both open and closed thermodynamic systems at the nanoscale. Second, I will discuss the role of strain engineering in thin films to achieve >50% multjunction solar cells with optimized bandgap energies. I will also discuss how we can resolve the photo-electronic properties of thin film solar cell technologies using near field scanning probe techniques. Such measurements help elucidate the main limitations of these devices, which currently dominate the PV market. Lastly, I will discuss design alternatives for tailoring the anode structural properties of solid-state thin film batteries to extend their lifetimes and improve their performance.

    BIO: Marina Leite is a CNST/UMD Research Associate in the Energy Research Group. She received her B.S. in Chemistry in 2003 and her Ph.D. in Physics from Universidade Estadual de Campinas (UNICAMP), Brazil, in 2007. She was a postdoctoral scholar in the group of Harry Atwater in the departments of Applied Physics and Materials Science at Caltech until 2011 when she moved to NIST. Her research interests include multijunction solar cells, nanoscale-resolution measurement techniques for photovoltaic materials, epitaxial quantum dots for solar cells, and solid-state batteries. Marina has published in journals such as Phys. Rev. Lett., Adv. Mat., and Appl. Phys. Lett., and received a number of recognitions, including from The International Union of Pure and Applied Physics (IUPAP).


     

     

  •  Winter Seminar: Wednesday, February 13, 2013

    You are cordially invited to the Mechanical Department Seminar Series
     
    Speaker Aaron Weast
     
    Date: Wednesday, February 13, 2013
    Location: EC 326
    Time: 4:00 - 5:00 p.m.
     
    Topic:
    A theme of how my SCU engineering education has led to success within Nike, talking about the Nike+, FuelBand, Back to the Future shoe, etc.  Also touching on unique factors and qualities that help engineers become successful within non-engineering organizations and leadership—talking through my interaction with our Nike's CEO and Exec teams (communication skills, learning the audience, conciseness, etc.).  Things that resonate with SCU's mission and unique breadth of content for an engineering degree.
     

    Bio:
    Aaron Weast (BSME '99) is one of the original founders of the underwater robotics programs at SCU.  He has most recently taken his talents to form the engineering team for Digital Sport (the team responsible for Nike+ FuelBand, Nike+ Basketball/Training, etc) where he led all engineering disciplines including the development of the science of NikeFuel.  Aaron also helped create the Nike Air Mag 2012, which raised over $11 million dollars for the Michael J. Fox Foundation. Most recently Aaron joined Nike's innovation team as the innovation lead for Nike Basketball and Brand Jordan.

  •  Winter Seminar: Wednesday, February 6, 2013

    You are cordially invited to the Mechanical Engineering Department Seminar Series

    Speaker: Timothy Hight
    Location: EC 326
    Time: 4:00 - 5:00

    Topic:  SCU Solar Decathlon Design and Technology

    Abstract:  SCU has participated in the Department of Energy Solar Decathlon intercollegiate competition in 2007 and 2009, and is preparing our design for the 2013 competition.  This talk presents an overview of our past entries and competition results, as well as a look ahead at our 2013 design.  I will highlight some of our design innovations in the context of our overall approach to the contest, and our successes.

    Bio:   Tim Hight has been at SCU since 1984, and was chair of the mechanical engineering department from 1998 to 2011.  He has his MS and PhD from Stanford University, and BS from CalTech.  His major teaching interest is in mechanical design, and he developed and supervises the senior design project program for the department.  Dr. Hight has been the faculty project manager for SCU’s 2007, 2009, and 2013 Solar Decathlon projects.

  •  Winter Seminar: Wednesday, January 30, 2013

     

    You are cordially invited to the Mechanical Engineering Department Seminar Series

    Speaker: Pete Woytowitz, Sr. Manager Lam Research Corp.
    Topic: Computational Modeling in Semiconductor Manufacturing Equipment

    Date: Wednesday, January 30th
    Location: EC 326, Bannan Engineering
    Time: 4:00 - 5:00

     

    Abstract:

     

    The name "Silicon Valley" was coined as a reflection of the prowess of the the Santa Clara Valley and surrounding regions in the area of semiconductor electronics research, design and development.  Originally all major electronics firms manufactured their own integrated circuits, mostly on silicon, and also designed the processes and equipment needed to build and manufacture the microelectronic circuits.  Today only the largest and leading edge electronics firms continue to manufacture their own chips in closely guarded fabrication facilities or fabs.  Also today almost all major electronics firms purchase the processing equipment from companies that specialize in wafer processing equipment.  Silicon Valley continues to have a high density of semiconductor equipment manufactures including several major players along with many smaller companies and start-ups specializing in a particular applications and processes.
    This talk will outline the electronics food-chain showing how consumers drive the electronics economy.  We will then talk about the typical design goals for semiconductor processing equipment.  Finally examples of Computational Modeling analyses that are used to help achieve the design design goals and speed time to market will be presented.

     

    Biography:

    Pete Woytowitz, Ph.D., P.E. is Sr. Manager of Computational Modeling and Reliability at Lam Research Corp.  He has worked in the semiconductor manufacturing equipment area for over 12 years and has in the past worked for companies including Exponent Failure Analysis, Ford Aerospace and Communications (now Loral Space Systems) and Boeing Commercial Airplane company.  He is an adjunct professor in Mechanical and Civil engineering at SCU and teaches courses in finite element analysis, advanced vibrations and related areas.
  •  Winter Seminar: Wednesday, January 23, 2013

     

     

    Please mark your calendar for speaker T. Calvin Tszeng

    Location: EC 326

    Time: 4:00 - 5:00 p.m.

    Date: 1/23/13

    Topic: Residual stresses in engineering components

    Abstract:

    Residual stresses in engineering components originate from irreversible, non-uniform changes, like inelastic (plastic) deformations or structural changes (phase transformation). Uncontrolled residual stresses always appear in components due to manufacturing processes. Desirable compressive residual stresses, on the other hand, are implanted in critical components through various surface modification techniques for enhanced resistance to fatigue and stress corrosion. While sub-surface residual stress is critical to fracture resistance, bulk residual stress is responsible for excessive distortion during machining processes or during thermal loading. Knowledge of residual stress distribution in engineering components shall greatly improve predictions of component performance and geometrical stability. This talk is to give a brief look at state of the art in the following topics pertaining to residual stresses: processing techniques, thermal and mechanical stability, and measurement methods, including a very recent research on non-destructive measurement method for full-field 3D bulk residual stresses.

    Bio:

    Dr. Tszeng is a Academic Year Adjunct Lecturer with Mechanical Engineering Department. He earned his Ph.D. degree from UC Berkeley. Dr. Tszeng used to be a faculty member at Illinois Institute of Technology, Chicago. Dr. Tszeng was the Principal Investigator of several research projects funded by US Department of Defense.

  •  Winter Seminar: Wednesday, January 16, 2013

    Please mark your calendar to hear guest speaker: Jeremy Munday

    Location: EC326

    Time: 4:00 - 5:00 p.m.

    Abstract: When light interacts with matter, a rich variety of phenomena can occur leading to both energy generation and mechanical motion under appropriate conditions. In this talk, I will present our recent results on two fronts: (i) energy generation from photons (quanta of light) and (ii) mechanical motion of microscale objects using either photon pressure or nanoscale quantum mechanic forces. In the first part, I will discuss how we can design and implement small-scale optical components in order to greatly improve the amount of absorption possible in thin photovoltaic devices—leading to significant efficiency improvements. We will also discuss new energy generating concepts that take advantage of so-called ‘hot electrons’ that are usually lost to heat. In the second part, I will discuss our work using both photon pressure and the Casimir force (a quantum mechanical phenomenon) to manipulate nano- and microscale objects. I will describe experiments in which we tailored these interactions between solid materials to achieve both attractive and repulsive nanoscale forces. While these projects are scientifically challenging, the graduate, undergraduate, and high school students in our lab have made great progress. I will highlight our team’s future directions for advanced energy generation.

    Bio: Jeremy Munday is currently an Assistant Professor of Electrical and Computer Engineering at the University of Maryland with affiliate appointments in the Institute for Research in Electronics and Applied Physics (IREAP) and the Chemical Physics Graduate Program at UMD. He received his PhD in Physics from Harvard in 2008, under the supervision of Federico Capasso, and his BS in Physics and Astronomy from Middle Tennessee State University in 2003. He was a postdoctoral scholar in the group of Harry Atwater in the departments of Applied Physics and Materials Science at Caltech until 2011 when he moved to UMD. His research endeavors range from near field optics, photonics, and plasmonics for energy harvesting to quantum electromechanical phenomena (such as the Casimir effect) for manipulating micro- and nano-mechanical devices. He has received a number of recognitions, including the NASA Early Career Faculty Space Technology Research Award.