{ "128558-21861171": { "datetime_modified":"20241031T103043", "datetime_start":"20241105T130000", "datetime_end":"20241106T030000", "has_end_time":1, "date_start":"2024-11-05", "date_end":"2024-11-06", "time_start":"13:00:00", "time_end":"03:00:00", "time_zone":"America\/Detroit", "event_title":"Dissertation Defense: Shock and Detonation Driven Breakup of Liquid Droplets", "occurrence_title":"", "combined_title":"Dissertation Defense: Shock and Detonation Driven Breakup of Liquid Droplets: Ral Bielawski", "event_subtitle":"Ral Bielawski", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"High-speed propulsion is a challenging and critical area of research. A major challenge with high-speed propulsion is the limited time scales available to mix\r\nand combust the flow within the residence time. When exploring practical propulsion systems, the requirement to utilize liquid fuels adds a further challenge,\r\nas the liquid needs to breakup, evaporate, mix, and burn within the same residence time. One promising method to deal with this challenge is to utilize\r\ndetonations or shock waves to accelerate the breakup, evaporation, and combustion. The details of a shock or detonation-driven breakup of liquid droplets is\r\nreceiving significant attention. However, a physical understanding and modeling of such multiphase detonations are hampered by a lack of models for the\r\nevolution and breakup of a single droplet after a shock or detonation. Experimental studies of this problem are available but can only measure macroscopic\r\nproperties and cannot resolve the quantitative details at small scales. High-fidelity interface-resolving numerical studies are needed to understand the\r\nbreak-up process better and the similarities and differences between detonation and shock-driven breakup.\r\n\r\nThe goals of this thesis are: 1) to gain insights into the stages of breakup and secondary droplet distribution throughout the breakup, 2) to leverage the stages\r\nof breakup and the droplet distribution to understand the impact of evaporation and how that may impact liquid fueled detonations. The breakup was found\r\nto follow five stages. Two of the key stages are the droplet flattening due to the pressure difference, while instabilities form on the droplet surface. That is\r\nfollowed by the rapid recurrent piercing of the droplet by these surface instabilities, resulting in the sudden catastrophic shattering of the droplet. The fraction\r\nof mass contained in secondary droplets was found to be minimal until this recurrent piercing. During the recurrent piercing, the secondary droplets followed\r\na log-normal distribution, with a few larger droplets not well represented by the log-normal distribution. However, these large droplets were short-lived and\r\nrapidly decayed to the log-normal distribution. This allows for the breakup to be approximated as an induction time until the breakup begins, followed by a\r\nbreakup where droplets are shed at the final log-normal distribution. For detonation-driven breakup, a similar process occurs, and the breakup time scale is\r\nsignificantly faster than the evaporation time scale for the primary droplet, resulting in minimal evaporation prior to breakup. Thus, the evaporation is\r\ncontrolled by the resulting change in the effective area due to the breakup and secondary droplet distribution. This allows for an extension of the mass\r\nstripping model to account for the induction time prior to breakup beginning and accounting for the secondary droplet distribution. Further work exploring\r\nliquid-fueled detonations is needed as the current work predicts the breakup and resulting distribution will control the evaporation time scales, but the mixing\r\nand ignition delay times scales have not yet been explored. This work represents the first interface-resolving study of detonation-driven breakup that captures\r\nheat transfer, phase change, and the secondary droplets; it is also the first study to capture the secondary droplet distribution during a shock-driven breakup.", "occurrence_notes":null, "guid":"128558-21861171@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/128558", "building_id":"null", "building_name":"Off Campus Location", "campus_maps_id":"1", "room":"https:\/\/umich.zoom.us\/j\/99003024439", "location_name":"Virtual", "has_livestream":1, "livetream_require_login":1, "cost":"", "tags":["#michiganengineering"], "website":"http:\/\/aero.engin.umich.edu", "sponsors":[ { "group_name":"Aerospace Engineering", "group_id":"3245", "website":"http:\/\/aero.engin.umich.edu" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2024\/10\/event_128558_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2024\/10\/event_128558_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2024\/10\/event_128558_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2024\/10\/event_128558_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2024\/10\/event_128558_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb\/media\/attachments\/2024\/10\/event_128558_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2024\/10\/event_128558_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2024\/10\/event_128558_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large_lightbox\/media\/attachments\/2024\/10\/event_128558_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2024\/10\/event_128558_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_list\/media\/attachments\/2024\/10\/event_128558_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2024\/10\/event_128558_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid\/media\/attachments\/2024\/10\/event_128558_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid_2x\/media\/attachments\/2024\/10\/event_128558_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_large\/media\/attachments\/2024\/10\/event_128558_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2024\/10\/event_128558_original-1.png" }, "occurrence_count":1, "first_occurrence":21861171 } , "128027-21860070": { "datetime_modified":"20241120T123145", "datetime_start":"20241105T130000", "datetime_end":"20241105T140000", "has_end_time":1, "date_start":"2024-11-05", "date_end":"2024-11-05", "time_start":"13:00:00", "time_end":"14:00:00", "time_zone":"America\/Detroit", "event_title":"Resume Lab", "occurrence_title":"", "combined_title":"Resume Lab", "event_subtitle":"", "event_type":"Careers \/ Jobs", "event_type_id":"2", "description":"*RSVP required to attend. Click \"Join Event\" here:\u00a0https:\/\/umich.joinhandshake.com\/edu\/events\/1636018Just getting started building a resume? Have a draft but not sure how to make it better? Want to learn about resources available to revise your resume? Wherever you\u2019re at Resume Lab is a great next step for you.\u00a0Get real-time, personalized support in a small group setting by checking out the Resume Lab.\u00a0We will discuss and educate you on\u2026- Design and format- Writing a great bullet point- Targeting your resume for specific internships\/jobs\u00a0If you're a Graduate Student or Recent Grad, please make a 1:1 appointment instead of attending the Lab because this event is designed for undergraduates.\u00a0Note: This event's information is shown in Handshake as well as on theHappening @ Michigan calendar so that it will be seen by a larger number of U-M Students.", "occurrence_notes":null, "guid":"128027-21860070@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/128027", "building_id":"", "building_name":"", "campus_maps_id":"", "room":"", "location_name":"University Career Center, 3200 Student Activities Building, Program Room (3003), 515 E Jefferson St, Ann Arbor, MI, United States", "has_livestream":0, "cost":"", "tags":[], "website":"", "sponsors":[ { "group_name":"University Career Center UCC", "group_id":"1140", "website":"http:\/\/careercenter.umich.edu" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21860070 } , "126328-21856897": { "datetime_modified":"20240912T181729", "datetime_start":"20241105T132000", "datetime_end":"20241105T135000", "has_end_time":1, "date_start":"2024-11-05", "date_end":"2024-11-05", "time_start":"13:20:00", "time_end":"13:50:00", "time_zone":"America\/Detroit", "event_title":"Eva Albalghiti, carillon", "occurrence_title":"", "combined_title":"Eva Albalghiti, carillon", "event_subtitle":"", "event_type":"Performance", "event_type_id":"15", "description":"Graduate student Eva Albalghiti performs on the Ann & Robert H. Lurie Carillon, an instrument of 60 bells with the lowest bell (bourdon) weighing 6 tons.\n\nThirty-minute recitals are performed on the Lurie Carillon every weekday that classes are in session. During these recitals, visitors may take the elevator to level 2 to view the largest bells, or to level 3 to see the carillonist performing. (Visitors subject to acrophobia are recommended to visit level 2 only.) An optional spiral stairway between levels 2 and 3 allows for up-close views of some of the largest bells.", "occurrence_notes":null, "guid":"126328-21856897@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/126328", "building_id":"1000394", "building_name":"Lurie Ann & Robert H. Tower", "campus_maps_id":"91", "room":"", "location_name":"Lurie Ann & Robert H. Tower", "has_livestream":0, "cost":"Free - no tickets required", "tags":["Free","Music","North Campus","Talk"], "website":"", "sponsors":[ { "group_name":"School of Music, Theatre & Dance (SMTD)", "group_id":"155", "website":"http:\/\/smtd.umich.edu\/events" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2024\/09\/event_126328_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2024\/09\/event_126328_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21856897 } }