Experimental Studies on Process of Hydrogen Synthesis in Intensive Hydrodynamic Cavitation in Liquid Hydrocarbons

This work carries out  the experimental studies on the hydrogen  production using intensive hydrodynamic cavitation in liquid hydrocarbons. The physical and chemical processes occurring in the cavitation bubble at the last stage of its compression are very similar to the processes occurring in the explosive chamber. The values of pressure and temperature achieved in this case provides the thermodynamic stability of the reaction products and the production of a gaseous mixture (aerosol) of hydrogen and carbon nanoclusters, which is confirmed by theoretical calculations. The controlled addition of hydrogen-containing liquids and the change in the compression conditions of cavitation bubbles make it possible to control the process of hydrogen synthesis, which is an important step in the development of modern high-tech alternative energy methods. The pulsation of a spherical cavity is described by the Kirkwood – Bethe equations, which are one of the most accurate mathematical models of pulsation processes at an arbitrary velocity of the cavity boundary. The model allows you to fully describe the process of pulsations of cavitation cavities, conduct comprehensive parametric studies and evaluate the effect of various process parameters on the collapse of cavities. This work continues the experiments on cavitation synthesis of carbon nanostructures. With the rapid movement of chemically pure benzene (С6H6) along the profiled channel in the form of a Venturi nozzle, cavitation bubbles form in the liquid, which are then compressed in the working chamber, in which a sharp pressure surge is created. The pressure in the shock wave, which reaches 80–90 MPa, ensures the collapse of cavitation bubbles close to adiabatic compression. As a result of the number of rapidly occurring physicochemical processes of evaporation, heating, and thermal dissociation of benzene vapors, a solid carbon phase and a gaseous hydrogen-containing phase are synthesized in the cavitation, which is then subjected to separation.

cavitation, hydrocarbon liquids, hydrogen, hydrodynamic compression, nanostructures, shock waves, Kirkwood – Bethe equations

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