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Initial Stages of Boiling

#G-688


Investigation of the Beginning of Boiling Process and its Hysteresis Zone by Optical and Electrocapacity Methods

Tech Area / Field

  • NNE-HCS/Heating and Cooling Systems/Non-Nuclear Energy
  • PHY-NGD/Fluid Mechanics and Gas Dynamics/Physics

Status
3 Approved without Funding

Registration date
26.02.2001

Leading Institute
NII Optica, Georgia, Tbilisi

Collaborators

  • University of Minnesota / Department of Mechanical Engineering, USA, MN, Minneapolis\nKyushu University/Department of Advansed Energy Enfineering Science, Japan, Fukuoka\nPennsylvania State University / Department Mechanical Engineering, USA, PA, University Park\nRutgers University, USA, NJ, Piscataway\nNUKEM Nuclear GmbH, Germany, Alzenau\nUniversity of Pittsburg, USA, PA, Pittsburgh\nKyoto University, Japan, Kyoto\nUniversity of Tsukuba / Institute of Engineering Mechanics and Systems, Japan, Tsukuba

Project summary

Without knowledge of processes of boiling it is impossible to make, calculate and maintain modern nuclear installations, space technique, chemical technology, refrigerating technique, energetic, domestic appliances etc. It is necessary to have reliable data on heat-physic properties, coefficients of heat exchange, critical thermal loading and at motion of two and multiphase flows.

There are many questions despite of numerous experimental data and theoretical works in this field, which require the further study of process of boiling.

In our project we shall try on the basis of modern achievement of science to create experimental installation, where by optical and innovative electrocapacity method will be explored the zone of beginning of bubble boiling and its hysteresis. Practically these problems have high profile for refrigerating, cryogenic technology of optical and space industry, where with the beginning of boiling thermophisical and hydrodynamic properties sharply changes, therefore it is necessary to know, thermal loading and heat transfer coefficients at which there is the transition from free convection to bubble mode. In this work influence of the various factors on this process will be explored.

Almost all natural processes in nature are chaotic. Boiling is the classical example of undigested chaotic systems. In last period the chaotic systems are studied by fractal structures. The example of that is study of turbulence by fractal structures.

In our project we will approach the problems of boiling as to the fractal object and zone of transition from free convection to bubble boiling. We will study boiling with help of high technology modern computers, interfaces, data units and computer programs. Experimentally will be explored and detected fractal dimensionality of this process (number Hausdorf and sections of Puankare). Unconditionally these fractal sizes under the hipotesys of physic of the boiling fluid will be non uniform. It is necessary also to take into account multivariate alternation and strong anisotropy.

The authors of the project hope, that the presented work will stimulate a new direction, research of physic of boiling on basis of fractal properties of the relevant phase portraits. Our researches will be made on two various experimental installations based on optical and electrocapacity measuring.


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The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.

 

ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

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