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UID:0-805@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20240619T133000

DTEND;TZID=Asia/Jerusalem:20240619T143000

DTSTAMP:20240609T061511Z

URL:https://aerospace.technion.ac.il/events/the-2024-prize-seminar-in-memo
 ry-of-prof-shmuel-and-mrs-noemi-merhav/

SUMMARY:The 2024 PhD Seminar in Memory of Prof. Shmuel and Mrs. Noemi Merha
 v – Theoretical Thermodynamic and Hydrodynamic Study of Liquids Under Ne
 gative Pressures.
DESCRIPTION:Lecturer:Orr Avni\n Faculty:Department of Aerospace Engineering
 \n Institute:Technion – Israel Institute of Technology\n Location:Classr
 oom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: https://technion
 .zoom.us/j/93899557822\n Abstract: When a liquid is subjected to a press
 ure below absolute zero\, the phase change becomes favorable\; however\, t
 he attractive interactions between the liquid molecules may hinder the pha
 se change process. From a mechanical standpoint\, the liquid stretches as
  the internal tension stresses\, or negative hydrostatic pressures\, devel
 op in the liquid bulk. Liquids subjected to negative pressure are abundant
  and could be utilized in several industrial and medical applications. S
 ome promising industrial innovations harness this phenomenon\, while other
 s seek to control and direct the nucleation occurring as the liquid relaxe
 s back to a stable state.\n\nHuygens made the first experimental observati
 ons of liquids under negative absolute pressures as early as 1662. Since t
 hen\, numerous experimental apparatuses have been developed to generate 
 negative pressure in liquids. However\, a significant discrepancy exists 
 between the maximum negative pressure a liquid can sustain before nucleati
 on onset\, as reported in different experiments. This gap\, which may exc
 eed 100 MPa\, is yet unexplained\, raising fundamental questions about the
  nature of liquids under extreme thermodynamic states and limiting the rel
 iable application of this phenomenon.\n\nAiming to bridge the gap in curre
 nt knowledge\, we first focus on the surface tension-controlled\, near-equ
 ilibrium growth of vapor bubbles. We present a new analysis for the early 
 stages of vapor bubble growth in superheated liquids capable of capturing 
 the early stages of bubble growth. We extend the analytic investigation by
  an extensive numerical study\, enabling a detailed analysis of vapor bubb
 le dynamics under highly oscillating negative pressures. The presented the
 oretical model may reveal possible future research pathways for better und
 erstanding the elusive and fascinating nature of liquids under negative pr
 essure.\n\nWork towards PhD degree under the supervision of Asst. Prof. Yu
 val Dagan and Prof. Eran Sher\n Details: \n 
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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