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UID:0-312@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20191209T163000

DTEND;TZID=Asia/Jerusalem:20191209T173000

DTSTAMP:20230527T131742Z

URL:https://aerospace.technion.ac.il/events/rate-limiting-constrains-in-ph
 ase-change-materials-pcm-for-miniature-aircraft-propulsion-systems/

SUMMARY:Rate Limiting Constraints in Phase-Change-Materials (PCM) for Minia
 ture Aircraft Propulsion Systems
DESCRIPTION:Lecturer:Matan Feldman\n Faculty:Department of Aerospace Engine
 ering\n Institute:Technion – Israel Institute of Technology\n Location:C
 lassroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract
 : \n Details: \n Micro Aerial Vehicles (MAV) require extremely lightweight
  propulsion systems. Whereas most current MAV use electric batteries as po
 wer sources\, the presented work examines the possibility of using Phase-C
 hange Materials (PCM) as part of an alternative propulsion system. The pro
 posed power plant involves a rapid depressurization of cryogenic fluids fr
 om a stable liquid state to create vapor nuclei (bubbles)\, followed by nu
 clei growth till they coalesce\, forming a continuous vapor phase which is
  heated by the surroundings and later drive a micro-turbine. The transform
 ation rate from liquid to vapor plays a prominent role in the system\, and
  the limiting transition rates of several materials are investigated in te
 rms of their initial temperature and pressure\, as well as of the dimensio
 ns of the orifice through which they exit.\nA theoretical parametric analy
 sis of these impacts will be thoroughly reviewed\, introducing the homogen
 eous and heterogeneous nucleation rates (according to several theories) al
 ongside the correlating depressurization rates necessary to achieve them\;
  as well as demonstrating the applicability of such propulsion systems to 
 propel a MAV by evaluating their outputs\, such as specific energy\, speci
 fic power\, possible mission time and total mass. The system combinations 
 that provide the minimal specifications will be exhibited\, with a focus o
 n Hydrogen and Neon - which were found to be the most promising substances
  per unit of mass and volume\, respectively. Comparison with electric batt
 eries will be presented.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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