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ISSN Online: 2379-1748
8th Thermal and Fluids Engineering Conference (TFEC)
THE EFFECTS OF THE GRAVITY AND AIRFLOW ON THE THICKNESS PROFILE AND SHAPE OF THE CURVED LIQUID FILM
Abstract
The atomization of the liquid film formed by impinging jets on a curved wall plays a significant role in engine combustion. And the atomization process can be affected by the shape and thickness profile of the liquid film. In order to investigate the main characteristics of the curved liquid film under different gravity angles, airflow velocities, and airflow pressure, the thickness, and shape and thickness profile of the liquid film were investigated experimentally based on LEDIF (LED induce Fluorescence) with a high-speed camera. The results show that as the gravity angle θ increases, the length of the film increases linearly, and the width of the film increases till the critical width. And as the gravity angle θ increases, the thickness profile along the center line decreases. As the airflow velocity Uair increases, the length of the liquid film increases significantly. And the width of the film decreases as the airflow velocity Uair increases when Uair≤ 30m/s, and increases when the Uair> 30m/s. When the gravity angle θ=30° and the Uair≥40m/s, the gravity can be ignored. As the airflow velocity increases, the thickness profile increases when x≤51mm, decreases when x>51mm. The length of the film increases linearly as the airflow pressure P increases, and the width of the film is almost kept unchanged. As the airflow pressure P increases, the thickness profile is almost kept unchanged when x≤40mm, and decreases slightly when x>40mm.