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The 21st International Congress on Sound and Vibration

13-17 July, 2014, Beijing/China

OPTIMIZATION CONTROL OF CAVITATION SPATIAL DISTRIBUTION IN A DUAL SOURCE SONOREACTOR

Delong Xu, Jingjun Deng, Chao Li, Lixin Bai

Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China e-mail: xudelong@mail.ioa.ac.cn

In this paper, the optimization control of cavitation spatial distribution by using of dual sound sources in liquid is investigated experimentally. An experimental system for cavitation spatial distribution control is set up and the “point” cavitation measuring method is proposed, which is a necessity in the optimization control of acoustic cavitations. Three point-measuring me- thods are adopted. Among them, the iodine releasing method and the aluminum foil erosion method have been improved by us. The trials focus on how facing dual sources promote the spatial distribution optiminum of acoustic cavitations, based on an approach proposed by Moholkar and his co-workers. More intense cavitations have been successfully produced ex- perimentally in areas far away from acoustic sources and less and negligible cavitations pro- duced in the vicinity of the acoustic sources. Improvements have been made to overcome the actual drawbacks in wider space and a simple example is given to show its feasibility. Ac- cording to the experiments, the optimization of cavitaion spatial distribution can be achieved in industry scale.

1. Introduction

In the past couple of decades, ultrasonics has obtained wildespread applications in industry, such as in non-destructive test, medical diagnosis, high intensity focused ultrasound, nano- technologies, waste water treatment, and so on [1,2]. Back in the 1920’s, the processing applications of ultrasound were found. Nowadays, such applications have extended to the branches called sonics, sonochemistry, sonoluminescence [1, 3, 4] et al. Those applications are attributed to the acoustic cavi- taton, a “magic” phenomenon which induces extreme conditions such as high temperature and high pressure, high density and highly intense shock waves resulting from the collapse of the transient cavitaion bubbles [5].

But, up to now, the aforementioned successful processing applications of ultrasound based on cavitation mechanism are mainly confined to the laboratories. The major shortcoming of ultra- sound reactors that has contributed mostly to their poor performance on an industrial scale operation is that cavitation occurs only in the close vicinity of the surface of the sonicator and consequently, severely limits the volume of the active part of the reactor [6,7]. Pandit et al. reported that the intro- duction of a second sound wave emitted by an ultrasonic horn in a sonoreactor results in better dis- tribution of cavitational activity resulting in uniform yields, minimizing the formation of standing waves and more effective utilization of the reactant volume and dissipated sound energy, and there- fore obtain maximum cavitational effects and higher chemical yields[8,9].

In this paper, first the theory of Moholkar et al.[6] are investigated with three “point”(actually, it’s “small area”) cavitation measuring methods are adopted and among them the iodine releasing

ICSV21, Beijing, China, 13-17 July 2014 1

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