Bubbly jet impingement with changeable impact angle in different liquids
- Paper number
IAC-09.A2.4.8
- Author
Mr. Francesc Suñol, Universitat Politècnica de Catalunya, Spain
- Coauthor
Dr. Ricard González-Cinca, Universitat Politècnica de Catalunya, Spain
- Year
2009
- Abstract
The opposed-jet configuration is used with the objective to force the collision of two bubbly jets, with an impact angle between them that can be changed from 0º (frontal collision) up to 90º. The impinging jets are introduced into a test tank full of liquid (water, ethanol, or silicon oil) by means of two bubble injectors whose operation is insensitive to gravity level for low Bond numbers. The bubble generation method is based on the creation of a slug flow inside a T-junction of capillary tubes of 0.7 mm diameter. Bubble velocities at the injector outlet, as well as bubble generation frequencies can be controlled by changing the gas and liquid flow rates. The experimental setup is designed for the study of bubbly jets collision in microgravity. On ground preliminary results on individual bubble properties, coalescence events and the whole jet structure are analyzed from the images recorded by a high speed camera, with the objective to make a comparison with the results to be obtained in low gravity conditions in a near future. We present on ground results on the role played by the impact angle and bubble velocities on the structure of the final jet. A systematic study for different gas and liquid flow rates has been carried out in liquids with different surface tension and viscosities.
- Abstract document
- Manuscript document
(absent)