News & Events
Department Events

Events

  • Sep
    28

    TAM Seminar - John Dolbow - The Mechanics of the Surfactant-Driven Fracture of Particle Rafts and the Influence of Surface Tension

    McCormick - Mechanical Engineering

    3:00 PM ME B211, Technological Institute

    EVENT DETAILS

    Thursday, September 28, 2017
    3:00pm - 4:00pm

    The Mechanics of the Surfactant-Driven Fracture of Particle Rafts and the Influence of Surface Tension

    Abstract

    When a densely packed monolayer of hydrophobic particles is placed on a fluid surface, the particles interact through capillary bridges, leading to the formation of a particle raft or ``praft". Densely packed monolayers exhibit a two-dimensional elastic response, and they are capable of supporting both tension and compression. The introduction of a controlled amount of surfactant generates a surface tension gradient, producing Marangoni forces and causing the surfactant to spread, fracturing the monolayer. These systems are of interest to materials scientists and engineers because they provide an idealized setting for investigating the interplay between fluid flow and fracture. Previous studies of the surfactant-induced fracture of prafts have examined the role of viscosity and the initial packing fraction on the temporal and spatial evolution of the fractures. This seminar will describe a new continuum-based model and simulations that account for the interplay between the pressure exerted by a spreading surfactant and the elastic response of the praft, including the fracture toughness. While our results indicate that the stochastic aspects of the packing are important to the fracture process, we find that regimes of fracture are largely governed by differences in surface tension. Finally, we support our findings with newly designed experiments that validate the model and confirm the trends inferred from the simulations.

    Biography

    John Dolbow is a Professor of Civil and Environmental Engineering at Duke University, where he directs the Duke Computational Mechanics Laboratory. He has been a faculty member at Duke University since 1999, and his research concerns the development of numerical methods for evolving interface problems. He has received various awards for his research, including Young Investigator awards from both the USACM and the IACM. He is the Editor-In-Chief of the journal Finite Elements in Analysis and Design. He currently serves as the Vice President for the USACM, as well as on the DOE’s Advanced Scientific Computing Advisory Committee.

    more less

    TIME Thursday, September 28, 2017 at 3:00 PM - 4:00 PM

    LOCATION ME B211, Technological Institute    map it

    ADD TO CALENDAR

    CONTACT Tami Santos    tami.santos@northwestern.edu EMAIL

    CALENDAR McCormick - Mechanical Engineering

  • Apr
    22

    ME512 Distinguished Speaker Seminar Marcia K. O'Malley

    McCormick - Mechanical Engineering (ME)

    3:00 PM LR3, Technological Institute

    EVENT DETAILS

    TIME Monday, April 22, 2024 at 3:00 PM - 4:00 PM

    LOCATION LR3, Technological Institute    map it

    ADD TO CALENDAR

    CONTACT Jeremy Wells    jeremywells@northwestern.edu EMAIL

    CALENDAR McCormick - Mechanical Engineering (ME)

  • Apr
    30

    ME Alumni Seminar Series- Apostolos Karafillis

    McCormick - Mechanical Engineering (ME)

    2:00 PM 1.350, Ford Motor Company Engineering Design Center

    EVENT DETAILS

    TIME Tuesday, April 30, 2024 at 2:00 PM - 3:00 PM

    LOCATION 1.350, Ford Motor Company Engineering Design Center    map it

    ADD TO CALENDAR

    CONTACT Jeremy Wells    jeremywells@northwestern.edu EMAIL

    CALENDAR McCormick - Mechanical Engineering (ME)

  • May
    3

    Russ Tedrake, MIT and Toyota Research Institute, "Dexterous Manipulation with Diffusion Policies"

    Center for Robotics and Biosystems (CRB)

    11:30 AM M416, Technological Institute

    EVENT DETAILSmore info

    TIME Friday, May 3, 2024 at 11:30 AM - 12:30 PM

    LOCATION M416, Technological Institute    map it

    ADD TO CALENDAR

    CONTACT Amy Nedoss    amy.nedoss@northwestern.edu EMAIL

    CALENDAR Center for Robotics and Biosystems (CRB)

  • May
    8

    Extending Care: A Conversation about Conservation and Futurity

    Block Museum of Art

    6:00 PM Block Museum of Art, Mary and Leigh

    EVENT DETAILSmore info

    TIME Wednesday, May 8, 2024 at 6:00 PM - 7:30 PM

    LOCATION Block Museum of Art, Mary and Leigh    map it

    ADD TO CALENDAR

    CONTACT Block Museum of Art    block-museum@northwestern.edu EMAIL

    CALENDAR Block Museum of Art

  • Jun
    10

    Northwestern Engineering PhD Hooding and Master's Degree Recognition Ceremony

    McCormick School of Engineering and Applied Science

    9:00 AM Welsh-Ryan Arena

    EVENT DETAILSmore info

    TIME Monday, June 10, 2024 at 9:00 AM - 11:00 AM

    LOCATION Welsh-Ryan Arena   

    ADD TO CALENDAR

    CONTACT Amy Pokrass    amy.pokrass@northwestern.edu EMAIL

    CALENDAR McCormick School of Engineering and Applied Science

  • Jun
    10

    Northwestern Engineering Undergraduate Convocation

    McCormick School of Engineering and Applied Science

    2:00 PM Welsh-Ryan Arena

    EVENT DETAILSmore info

    TIME Monday, June 10, 2024 at 2:00 PM - 4:00 PM

    LOCATION Welsh-Ryan Arena   

    ADD TO CALENDAR

    CONTACT Amy Pokrass    amy.pokrass@northwestern.edu EMAIL

    CALENDAR McCormick School of Engineering and Applied Science