Download e-book for iPad: Application of Hydrodynamic Cavitation in Environmental by Janusz Ozonek

By Janusz Ozonek

ISBN-10: 0415616263

ISBN-13: 9780415616263

Containing the state of the art in hydrodynamic cavitation, the publication includes elements. the 1st half offers the actual foundation of cavitation and a scientific category of assorted varieties of cavitation and their formation assets. particular cognizance is paid to a gaggle of things that advertise cavitation formation in usual drinks. A basic version of cavitation is formulated in addition to a sub-model describing dynamics of the formation, improvement and cave in of cavitation bubbles. The sub-model additionally comprises results of cavitation bubble prevalence at the liquid within the direct area of bubbles. eventually, half one additionally incorporates a thermodynamic hydrocavitation version of water containing cavitation nuclei (natural waters). the second one half offers with the appliance of hydrodynamic cavitation results to complicated oxidation of drugs that pollute the typical surroundings. result of laboratory experiments at the software of cavitation results to decompose chosen natural compounds which hardly ever endure biodegradation are awarded, in addition to an idea of the cavitation phenomenon software on an commercial scale.

Application of Hydrodynamic Cavitation in Environmental Engineering should be helpful to execs facing the layout and sensible program of hydrocavitation reactors, and to lecturers in environmental engineering.

 

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Example text

Conventional methods such as coagulation or activated carbon adsorption are usually associated with the transfer of pollution from one stage to another and they do not completely eliminate the pollution. 1). , 1987) as processes during which highly reactive •OH radicals are generated, being one of the most powerful oxidising agents which react very quickly with most organic compounds. With the help of the hydroxyl •OH radicals, organic compounds dissolved in water or sewage are oxidized into simple more biodegradable compounds.

The function of this layer is to absorb and compensate the tensile stresses, which prevent the “barrier” from breaking and the gas dissolving in the water. The spherical bubble is in a state of equilibrium, if the forces directed radially in onto the surface are balanced. 16). The dynamic mechanical equilibrium of the bubble is not steady state, since the inward radial surface tension increases as the bubble size decreases. If the bubble size is smaller than some critical value it will disappear due to a rise in the surface tension.

1. Basic factors influencing the intensity of the cavitation process. 1) where: l, l1, l2, …, ln – Linear values defining the size, shape, location of the body, and in addition its surface condition, microbubble dimensions and solid particles constituting the cavitation nucleus. K, Re, We – Numbers (Cavitation, Reynolds and Weber) characteristic of cavitation. Increasing the Reynolds number (Re) is usually accompanied by an increase in the Cavitation number (K). This may be the result of an increase in the flow rate or a decrease in the coefficient of kinematic viscosity, which also leads to local increases in velocity by reducing the thickness of the boundary layer.

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Application of Hydrodynamic Cavitation in Environmental Engineering by Janusz Ozonek


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