This paper summarises a study which aims to develop and analyze the performance of the valveless impedance pump. Mechanism of valveless impedance pump is to apply acoustic impedance mismatch in order to drive the flow and also consists of a flexible connection at the ends to the more rigid sections. Characteristics of liquid velocity and pressure at the pump base valveless impedance at various supply voltage and different frequencies have been discovered through experimentation. Secondly, this research also aims to discuss the effect volume flow rate (millitres / min) in the elastic tube impedance based on different parameters of the pump pinch. The variation of pinch location and pinch width are also available through the results of this study. This study begins with the design set up to use the software and followed by installing all equipment used for the experiments. Then, this study continues to get results and make an analysis of the impedance pump by experimentation. Results found that all the parameters used in this experiment affect the flow rate in the impedance pump. Additional experiments on the effect of the thickness of the flexible tube on the flow rate gave lower values when the flexible tube is relatively thicker.
The swirl effervescent injector has more desirable characteristics because it allows a system to run on low injection pressure and yet is still able to achieve an efficient atomization. In previous studies on other types of injectors, spray breakup length was reported as one of the important spray characteristics since a shorter spray breakup length tend to provide an earlier atomization. However, intensive studies on spray characteristics of the swirl effervescent injector are scarce. This paper is intended to describe the geometrical design procedures and performance assessments of a newly developed swirl effervescent injector. In designing the injector, a similitude technique was deployed to find the best design attributes among 4 existing injectors. The desired attributes were incorporated into the development of the injector. The swirl chamber was made from Perspex to permit visualization of the internal flow. A test rig was built to evaluate the injector’s performance. Water was used as the working fluid and nitrogen gas as the atomizing agent. The spray breakup characteristics were observed at different GLR and recorded using high-speed shadowgraph technique. For the analyses of the video recordings and the conversion into image sequences, ImageJ and specific software have been deployed. It was found that the introduction of the swirl-generating vane prior to the discharge orifice has assisted in shortening the spray breakup length at any amount of GLR.
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