Abstract
Abstract Extreme environmental changes caused by the cavitation bubble collapse, such as high pressure, high temperature and the microjet, will cause pyrolysis reaction at the gas and liquid interface inside the bubble. Self-excited pulsed cavitation jet has an instantaneous strong pulse pressure, which leads to local hot spots surrounding the cavitation bubbles. The generation of strong oxidizing free radicals promotes easy ozone conversion into oxygen. Numerical simulations were conducted for ozone decomposition by cavitation jet. Three groups of different collision angles were applied to compare and analyze the ozone degradation reaction. Results showed that the collision angle has a certain influence on the chemical reaction intensity, the degradation of ozone, and oxygen production. At the collision angle of 180°, the chemical reaction was the most violent, with ozone degradation and oxygen production at the highest level, followed by 120° and lowest at 90°.
Highlights
The self-excited pulsed cavitation jet is a kind of highefficiency pulsed jet [1]
With the development of computational fluid dynamics (CFDs), the fluent platform has been applied to conduct a variety of comparative analyses and numerical simulations of self-excitation pulse cavitation jets [4,5]
The position of ozone entrance is located at the upper side 30 mm from the left chamber surface to conduct numerical analysis of the chemical reaction of ozone decomposition in the chamber with self-excitation pulse
Summary
The continuous jet flow produces self-excited oscillation through a special structure and transforms into an oscillating pulse jet with a stronger impact and shock effect. Based on the operating principle of a self-excited cavitation nozzle [2], the organ nozzle could be designed by changing the structure size to change the vibration frequency. With the development of computational fluid dynamics (CFDs), the fluent platform has been applied to conduct a variety of comparative analyses and numerical simulations of self-excitation pulse cavitation jets [4,5]. A two-dimensional unsteady numerical simulations with mixture model are adopted to investigate the influence of nozzle structure and environmental parameters on the effect of self-excited oscillation pulsed with a nozzle with an upper diameter of 6.68 mm [8]. Compared with the linear pressure distribution model, the collapse process of
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