Ievtushenko O. Processes of the mechanical energy and heat transformation and dissipation in the complex thermodynamic systems

The thesis is devoted to theoretical and experimental research of the mechanical and thermal energy conversion and dissipation in the heterogeneous lyophobic systems (HLS) and on the example of experimental Joule's tools to determine the mechanical equivalent of heat (MEH). The main goal of the research is to find answer to the question: "Is the unequivocal concept of MEH and its versatility" The mathematical approach to analyzing processes of the mechanical energy conversion and dissipation in complex thermomechanical systems with many degrees of freedom under involving of different nature mechanical forces was suggested. The reasons for the large spread of the theoretical and experimental values of the MEH under attracting working medium of different nature (solid / liquid / gas) were given. The theoretical justification of the experimental methodology of Joule's experiments to determine the MEH under viscous and dry friction conditions was given, which had not previously been discussed in the scientific and technical literature and it can be used by researchers of the history of physics of the XIX-XX centuries. Experimentally determined the temperature dependence of the mechanical work and heat of liquid intrusion/extrusion in nano- and mesopores of the hydrophobic matrix in a wide temperature range. Experimentally obtained and theoretically explained the temperature dependence of the ratio "work/heat" of isothermal interfacial area formation.