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UID:0-337@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20190327T163000

DTEND;TZID=Asia/Jerusalem:20190327T173000

DTSTAMP:20230527T134753Z

URL:https://aerospace.technion.ac.il/events/study-of-liquid-atomization-by
 -homogeneous-flash-boiling-mechanism/

SUMMARY:Study of Liquid Atomization by Homogeneous Flash Boiling Mechanism
DESCRIPTION:Lecturer:Yahav Moshkovich\n Faculty:Department of Aerospace Eng
 ineering\n Institute:Technion – Israel Institute of Technology\n Locatio
 n:Classroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstr
 act: \n Details: \n Over the years\, different methods have been developed
  in order to obtain suitable sprays for different applications. The most i
 mportant characteristics of a spray include the drops diameter\, droplet s
 ize distribution\, sprays shape\, flow velocity and mass flux. Former stud
 ies show that the flash boiling method is one of the most efficient method
 s to obtain a spray with very small droplets\, with a uniform distribution
 . This is relevant for many applications such as combustion systems\, for 
 which higher combustion efficiency and low pollution are important. Today\
 , flash boiling sprays are widely used to generate fine sprays in air refr
 eshers\, insect fighting\, painting and some pharmaceutical applications.\
 nFlash boiling is obtained when a liquid at a high pressure is allowed to 
 flow through an orifice towards a low ambient pressure\, which is below it
 s saturation pressure\, so bubbles nucleation is likely to occur. In fuel 
 atomization systems\, the nucleation is followed by bubbles’ growth\, le
 ading to liquid jet atomization. Depending on the liquid initial temperatu
 re\, its critical temperature\, the ambient pressure and the rate of press
 ure drop\, two major types of nucleation may occur\; nucleation at the liq
 uid/solid interface (heterogeneous nucleation)\, and nucleation at the liq
 uid bulk (homogeneous nucleation).\nThe occurrence of flash boiling atomiz
 ation involves kinetic stability problems that are characterized by two cr
 iteria that include a minimal initial liquid temperature and a minimal rat
 e of pressure drop. In this work\, we analyze\, and suggest analytical exp
 ressions for those two criteria. Furthermore\, this study presents experim
 ental results of sprays that were generated by flash boiling mechanism in 
 a variety of operation conditions. Those results support the findings of t
 he theoretical analysis.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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