Experimental Investigation of a High Aspect Ratio Rectangular Liquid Jet in Parallel Airflow

Document Type : Research Article

Authors

1 Department of Aerospace Engineering

2 Aerospace Engineering Department

3 Amirkabir University of Technology

Abstract

In this study, the flow dynamics of a high aspect ratio rectangular liquid jet issued into parallel airflow was experimentally investigated using a proof of concept setup, a more appropriate setup will be designed for a complete study later. The liquid flow was emanated from a rectangular injector with a thickness of 0.64 mm and an aspect ratio of 21. The injector was set in the center of the test section and the effects of airflow on the liquid flow were evaluated. A particular holding mechanism was designed and built to minimize the induced perturbations on the liquid flow. To identify the physics of the liquid flow shadowgraphy technique and high-speed imaging were implemented. In order to provide a comprehensive study of the problem, the experiments were performed for a wide range of flow conditions, and flow visualizations were presented. Jet Weber number and Gas Weber number were varied from 3 to 120 and 0.2 to 12, respectively Also, five regimes of the liquid flow including column, column/gravity, arcade, bag, and multimode were recognized. A mapping with gas Weber number and momentum ratio as the determining variables was suggested to distinguish these regimes from each other. The breakup length of the liquid jet was also measured. It was found that with the increase of jet Weber number the breakup length was increased at constant gas speed. Moreover, it was revealed that the breakup length was elongated with the increase of gas Weber number.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 11
February 2022
Pages 5429-5444

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