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ICLASS 94<br>Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems

ISBN:
978-1-56700-019-1 (Print)
978-1-56700-445-5 (Online)

INVESTIGATION OF GAS-DISSOLVING EFFECT ON THE SPRAY-FORMATION OF A STEADY-JET

Siichi Shiga
Department of Mechanical Engineering, Faculty of Engineering, Gunma University, Gunma, Japan

Zhen Huang
Key Laboratory of Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Minhang District, 200240 Shanghai, People's Republic of China

Y.M. Shao
Chongqing Institute of Communications, Chongqing, PR China

Takao Karasawa
Department of Mechanical Engineering, Faculty of Engineering, Gunma University, Gunma, Japan

Hisao Nakamura
Department of Mechanical Engineering, Faculty of Engineering, Gunma University, Gunma, Japan

S. Makita
Gunma University, Kiryu, Japan

Abstract

This paper presents a further investigation of the effect of gas-dissolving on the atomization characteristics of a steady-jet. On the basis of the previous feasibility studies, a parametric study was developed, by varying the dissolved-gas concentration and the nozzle configuration parameter. A detailed measurement of dissolved-gas concentration within a container shows that a gas-blasting method realizes completely uniform concentration distribution but the gas-pressing method produces large distribution under some condition varying from zero to its saturated value. When the dissolved-gas concentration is relatively low, it has an effect of atomization suppression. When the concentration is relatively large, the dissolved-gas has an effect of promotion which is caused by a characteristic mode of atomization. Thus, there is a critical concentration of the effect. These effects tend to be more intense with the increase in the nozzle L/D ratio. Therefore it can be said that the sensitivity of the dissolved-gas effect is increased with increasing the L/D ratio, which may be related to the residence time within the nozzle. The kind of dissolved-gas is also suggested to be important for the effect. Even when the atomization is suppressed by the gas-dissolving, the spray includes the atomization improved part in its periphery. This means that the spray has a dual-construction and the promotion of atomization starts to occur from its periphery.