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Stimulated Condensation

#3229


Stimulated Condensation in Supersonic Flows

Tech Area / Field

  • MAT-SYN/Materials Synthesis and Processing/Materials
  • PHY-OTH/Other/Physics

Status
3 Approved without Funding

Registration date
30.03.2005

Leading Institute
Institute of Thermophysics, Russia, Novosibirsk reg., Novosibirsk

Supporting institutes

  • VNIIEF, Russia, N. Novgorod reg., Sarov

Collaborators

  • Institute of Electronic Structure & Laser, Greece, Heraklione\nUniversity of Arizona / Department of Chemistry, USA, AZ, Tucson

Project summary

The main goal of the project is a comprehensive experimental and theoretical study of the stimulated condensation in supersonic jets and looking for ways of applications of this process
  • for development of methods of cluster generation with narrow size distribution function;
  • for macromolecule and nano-particle formation control;
  • for finding - out of the role of the condensed phase particles in the various film deposition technological schemes;
  • for study of mechanisms, dynamics and kinetics of physical and chemical reactions with cluster participation.

The experimental studies are planned to be carried out in a steady-state and pulsed jets formed by sonic and supersonic nozzles, which provides wide opportunities to vary experimental conditions and gas parameters: from well determined, stationary ones (behind a Laval nozzle) to highly abrupt flows in free jets. The pressure and temperature achieved in our devices vary respectively in the ranges from 1020 down to 1013 cm-3 and from 800 K down to < 10 K.

Stimulation is primarily understood as the introduction or creation of specific particles in the gas flow (ions, easily condensed molecules, other nucleation centers), which are able to provoke the nucleation and enhance the cluster growth. The charged particles are planned to be introduced inside and/or outside a gas source (nozzle prechamber) by gas discharge, thermo-electron emission or photo-ionization of atomic particles. Mass-spectrometry, Rayleigh scattering and other appropriate passive and active optical spectroscopy will be used to diagnose the condensed phase and products of physical and chemical reactions.

The experimental equipment and methods available for the project participants allow receiving data necessary for the reaching of detailed description of the stimulated nucleation/condensation and constructing of an adequate model of the phenomena. Besides, the tasks of the project embrace seeking of appropriate schemes and flow conditions allowing generation of clusters of specified size with narrow distribution function, as well as investigation of the role of clusters, their composition, structure and size in macromolecule and nano-particle growth and in physical and chemical kinetics. All this is of a great interest for modern material and surface technologies and also for atmospheric and space sciences.

Experimenters on rarefied gas dynamics, condensation, physical and chemical kinetics, low temperature plasma (IT SB RAS), physicists-theoreticians (IT SB RAS and VNIIEF) and specialists in applied mathematics (VNIIEF), experts in theory and numerical simulation of gas dynamics and kinetic processes including atoms, molecules, ions and electrons will participate in the Project. Many of them have been noted for their research in the field, in particular, for works published on the Project subject matter. The papers of the Project manager and scientific leader Dr. A.E. Belikov on the low temperature molecular kinetics have won wide recognition in Russia and abroad. The sub-manager and scientific leader in VNIIEF professor L.P. Babich is well-known for his works on physical kinetics in gas and plasma and has obtained recognition of the world scientific community.


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