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MNE MS Thesis Defense by Mr. Leandre Berard (New Date of 2/24/15)

When: Tuesday, February 24, 2015
1:00 PM - 3:00 PM
Where: Textiles Building 101E
Description: The Mechanical Engineering Department is pleased to announce the MS THESIS DEFENSE of Mr. Leandre Berard:

February 24, 2015 (New Date)
1:00 p.m. - 3:00 p.m.
Textile Building, Room 101E

TOPIC:
Computational Investigation of Underwater Buoyant Oil Jets

ABSTRACT:
Using computational simulations, the behavior of underwater buoyant oil jets is investigated in two different configurations. In the first set, the directions of the jet flow and the buoyancy force are aligned. The results show three main jet breakup regimes: atomization, skirt-type and pinch-off. The computational results agree well with the experimental results. The computational and experimental results both suggest that in a buoyancy-driven regime, jet breakup occurs only when the jet is accelerated to a point where the local Richardson number becomes less than 0.4, in which case the local Weber number is above 10. The results also demonstrate that the correlation proposed by Masutani and Adams as the boundary for the atomization regime can be extended for turbulent jets as well. The computational results reveal the mechanisms leading to formation of small droplets around the perimeter of energetic jets and umbrella-shaped jet separations at less energetic cases. In the second configuration, the directions of the jet flow and the buoyancy force are opposing or at an angle. The injection angle is varied from perfectly vertical to 45Ëš from the vertical position. Transition from stable to unstable behavior of the jet is observed. The results show that the transitional Ri increases as the injection angle is increased, until the injection angle is approximately 15Ëš. Beyond this point the transitional Ri begins decreasing with increasing the injection angle. The computational results also reveal that it is the vortex structures and their shedding that leads to the jet interface instability.

ADVISOR:
Dr. Mehdi Raessi

COMMITTEE MEMBERS:
Dr. Mehdi Raessi, Dr. Raymond Laoulache, Dr. Sankha Bhowmick

Open to the public. All MNE students are encouraged to attend.

For more information please contact Dr. Mehdi Raessi (mraessi@umassd.edu, 508-999-8496).

Thank you.
Topical Areas: University Community, Mechanical Engineering