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UID:0-214@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20220110T133000

DTEND;TZID=Asia/Jerusalem:20220110T143000

DTSTAMP:20230403T122400Z

URL:https://aerospace.technion.ac.il/events/cavitation-and-bubble-dynamics
 -in-aviation-fuels/

SUMMARY:Cavitation and bubble dynamics in aviation fuels
DESCRIPTION:Lecturer:Dr. Igal Gluzman\n Faculty:Department of Aerospace and
  Mechanical Engineering\n Institute:University of Notre Dame\, Indiana\, U
 SA\n Location:https://notredame.zoom.us/j/7498300665?pwd=ck5lM1JPbzE5dXRCa
 DdCQ3VjOGw4dz09\n Zoom: \n Abstract: \n Details: \n Cavitation in the airc
 raft fuel systems can lead to unexpected damage to fuel-system components.
  Modeling fuel cavitation is challenging due\, in part\, to the fact that 
 fuels are a complex mixture of hundreds of hydrocarbons. This study is foc
 used on the fundamental understanding of cavitation inception\, shock wave
  generation mechanisms\, and bubble dynamics in aviation fuels via rigorou
 s experimental studies and modeling efforts.\nFirst\, we present unprecede
 nted quantitative data on shock wave propagation characteristics in the co
 nverging-diverging nozzle obtained via a novel high-speed image processing
  technique we term "enhanced gradient shadowgraphy". Two sustained mechani
 sms are found to be responsible for shock wave generation. We obtain nonli
 near solutions of the governing equations to predict shock speeds. Good ag
 reement is achieved with experimental data.\nSecond\, we employ advanced c
 omputer-vision algorithms to extract quantitative data from high-speed ima
 ging on the bubble spatial-temporal evolution and breakup kinematics. We s
 how that the initial bubble size plays an essential role in the resulting 
 void fraction variation but not in the breakup kinematics. We also define 
 a unique dimensionless parameter that predicts the bubble breakup event fo
 r different fuels and flow regimes.\nLastly\, we derive a new model to pre
 dict cavitation collapse in radial flow between two parallel disks with a 
 thin gap\, representing a geometry relevant to aviation fuel pumps. The mo
 del predictions of the cavitation cloud collapse in the disk geometry show
  remarkable agreement with experimental data. Our findings shed light on t
 he complex physics of fuel cavitation and the dynamics of nonspherical cav
 ities.\nZoom meeting
CATEGORIES:Seminars
LOCATION:https://notredame.zoom.us/j/7498300665?pwd=ck5lM1JPbzE5dXRCaDdCQ3V
 jOGw4dz09

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TZID:Asia/Jerusalem

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DTSTART:20211031T010000

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