Department of Modeling and Identification of Thermal Processes

Head of Department:
Academician NAS of Ukraine

Matsevity Yuri Mikhailovich

E-mail: matsevity@ipmach.kharkov.ua   E-mail: kostikov@ipmach.kharkov.ua

Department of Modeling and Identification of Thermal Processes

The Department was founded in 1972. Since that time, it was headed by Yu.M. Matsevity who managed the creation of the thermal engineering school for solving nonlinear direct and inverse heat transfer problems. The Department's laboratory has developed methods of analyzing the thermodynamics of heat-and-mass transfer processes. The Department is staffed with 25 persons, including 3 Doctors of Science and 11 Candidates of Science. The Department’s scientists have published 15 monographs and 600+ papers in journals. The Department has turned out 27 Candidates and 10 Doctors of Science.

Main research topics

  • Nonlinear heat transfer
  • Modeling thermophysical processes (direct problems)
  • Identification of parameters of heat systems (inverse problems)
  • Diagnostics of thermal objects
  • Heat pump installations (processes and constructions)
  • Integrated processing of high-ash coal with output of Fe-Si-Al alloys, rare earth elements and hydrogen
  • Investigating thermal processes in power facilities, electronics and production processes

Basic research

  • Analytical modeling, identification and regional-analytical thermal process management
  • Investigating thermal processes and improving the design of heat pump installations and other heat transformers
  • Experimental and analytical research in heat processes in heat exchange equipment
  • Numerical modeling and identification of heat process parameters
  • Developing the technology of low-cost upgrading and per unit reconstruction of the equipment of high-capacity power
    units in TPPs, NPPs and hydro power stations to increase their efficiency and reliability
  • Developing the technologies of diagnosing and extending the life of power equipment at TPPs, NPPs and hydro power stations
  • Developing the methodology of solving geometric inverse heat transfer problems

Applied research

  • Developing methods, algorithms and software for numerical –analytical modeling of
    nonlinear nonstationary heat processes in construction elements and structures affected by flames
  • Improving the design of HPI and other heat transformers
  • Developing techniques and software for identifying the parameters of heat systems
  • Developing new designs and improving those of commercial convectors
  • Developing the techniques of low-cost upgrading of power equipment
  • Research in integrated processing of high-ash coal, rare earth elements and hydrogen

BASIC RESEARCH

Analytical and numerical methods have been developed for solving nonlinear multidimensional nonstationary direct and inverse heat transfer problems. In particular, based on the joint usage of structural and variational methods of solving nonlinear heat transfer problems for complex-shape areas, methods and universal algorithms have been developed that allow precisely, at the analytical level, to account for the geometry of the investigated object. Approximate analytical solutions have been obtained for nonlinear heat transfer problems as functional series with respect to certain base functions of the structural and regional-structural methods. this allows extending the scope of analysis, treatment and storage of information in databases. This is especially important due to development of advanced information technologies.

A methodology has been developed for solving inverse heat transfer problems of different types (boundary, inner, geometric and combined). Several methods have been developed for solving inverse heat transfer problems, in particular, the automated fitting method, the spectral influence functions method, and the optimal dynamic filtration method. Regularization methods have been developed for defining the thermophysical properties of materials by solving the inverse heat transfer problem. Techniques have been developed for optimal thermal design of heat-loaded objects with account of temperature constraints.

We have developed the principles of mathematical modeling of heat processes involved in grinding hard and super hard materials.

The physical regularities of convective heat transfer in closed sealed cavities have been established. Criteria regression equations have been obtained for calculating heat transfer and aerodynamic drag as a function of geometric and operation condition parameters for lattice, helical and helical-toroidal heat exchange surfaces with transverse and longitudinal blowing, which are formed with a flexible ribbed heating wire.

Methods for diagnostics of the thermomechanical condition of power equipment components have been developed to increase the effectiveness and reliability of their operation and extending their life. Technologies for low-cost upgrading of steam turbines have been developed.

Methods for effective design of special-purpose heat pump installations, including a steam compressor heat pump installation, and a reversible conditioner-heat pump have been developed. The option of using carbon dioxide as a refrigerant for HPI has been considered. Investigations in developing principally new heat exchange apparatus with a rotating heat carrier flow have been conducted. The methodological approach to designing such heat exchangers has been drawn up.

The physico-chemical basics of heat-and-mass transfer during phase and chemical conversions have been developed. The theoretical basics of nonconventional power engineering have been developed. Methods for designing circulation and film evaporators, and reactors for obtaining hydrogen from water using alloys and hydrides have been developed.

APPLIED RESEARCH

Techniques for diagnostics of the technical condition of power equipment by indirect measurement to define its residual life have been developed. The conditions of heat transfer in the cooling channels of turbo machinery, on the surfaces of casings and steam turbine rotors, and in ICE cylinders have been defined. The heat conditions of a steam turbine casing have been optimised.

The thermophysical properties of polycrystalline super hard materials, metal hydrides, amorphous metals and ceramics have been identified. The problem of simultaneous identification of thermophysical characteristics and heat transfer boundary conditions for a with dispersed liquid during induction hard facing has been solved.

Investigations in heat management for electronic devices have been conducted.

The boundary conditions on the surfaces of electronics components and the thermal contact resistances between them have been defined. Optimal thermal design of electronics devices has been conducted, and the following has been designed: cermet heating elements, liquid micro channel cooling systems, and contour heat pipes with capillary pumping of a two-phase heat carrier.

Identification and optimisation of heat processes in certain industrial facilities during production processes has been carried out. In particular, the power of inner heat sources during induction heating of metals and induction facing of solid semiconductor wafers has been obtained. The following has been defined: the depth of rolled sheet firing, the geometry of cooling boxes for fired units, and the depth of destruction of the flash smelting furnace bottom. The following has been optimised: heat processes during induction hard facing, the process of activation annealing of semiconductor wafers, and the heat engineering process of slag granulation.