Can simultaneous PIV in the gas and liquid phases provide insight into the transfer of momentum between the two phases?

Kim, J. H.; Hann, D. B.; Eastwick, C. M.; Cherdantsev, A. V.

Abstract

Understanding the interaction between a gas shearing over a liquid film and the liquid film is essential if we wish to use modeling to optimize systems to decrease environmental impact, increase efficiency and hence productivity. To this end, PIV is used to simultaneously study the velocity fields in the gas and liquid fields to better understand the interaction between the two phases.
The methodology is detailed in the paper and initial results show that the film shape changes as the flow increases from 2.2 m/s to 4.7 m/s. This change can be seen to be from a 2D surface wave regime to a 3D wave regime. In the 2D regime, the liquid film is linear in shape and the averaged and conditionally averaged velocity profiles of the gas and liquid velocity are equal at the interface.
In the 3 D regime, the averaged liquid and gas velocity profiles are no longer equal at the average interface height. Instead, they coincide at the 2.5% percentile of the local height distribution. The conditionally averaged velocity profiles show significant differences as the film height changes.
It is suggested that this would mean the use of average profiles for validating CFD in similar situations might need to be reviewed.

Citation

Kim, J. H., Hann, D. B., Eastwick, C. M., & Cherdantsev, A. V. (2022, July). Can simultaneous PIV in the gas and liquid phases provide insight into the transfer of momentum between the two phases?. Paper presented at 20th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics, Lisbon, Portugal

• Presentation Conference Type: Conference Paper (unpublished)
• Conference Name: 20th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
• Conference Location: Lisbon, Portugal
• Start Date: Jul 11, 2022
• End Date: Jul 14, 2022
• Deposit Date: Apr 26, 2023
• Publicly Available Date: May 24, 2023
• Public URL: https://nottingham-repository.worktribe.com/output/20000731