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Citation:
　Lakshitha T. Premathilake,Poojitha D. Yapa,Indrajith D. Nissanka,et al.Modeling the Flow Regime Near the Source in Underwater Gas Releases[J].Journal of Marine Science and Application,2016,(4):433-441.[doi:10.1007/s11804-016-1376-4]
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Modeling the Flow Regime Near the Source in Underwater Gas Releases

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Title:
Modeling the Flow Regime Near the Source in Underwater Gas Releases
Author(s):
Lakshitha T. Premathilake;  Poojitha D. Yapa;  Indrajith D. Nissanka;  Pubudu Kumarage
Affilations:
Author(s):
Lakshitha T. Premathilake;  Poojitha D. Yapa;  Indrajith D. Nissanka;  Pubudu Kumarage
Department of Civil and Environmental Engineering, Clarkson University, Potsdam, NY 13699, USA
Keywords:
underwater gas releases|bubble plumes|near source conditions|plumes/jets|oil and gas spill models
分类号:
-
DOI:
10.1007/s11804-016-1376-4
Abstract:
Recent progress in calculating gas bubble sizes in a plume, based on phenomenological approaches using the release conditions is a significant improvement to make the gas plume models self-reliant. Such calculations require details of conditions Near the Source of Plume (NSP); (i.e. the plume/jet velocity and radius near the source), which inspired the present work. Determining NSP conditions for gas plumes are far more complex than that for oil plumes due to the substantial density difference between gas and water. To calculate NSP conditions, modeling the early stage of the plume is important. A novel method of modeling the early stage of an underwater gas release is presented here. Major impact of the present work is to define the correct NSP conditions for underwater gas releases, which is not possible with available methods as those techniques are not based on the physics of flow region near the source of the plume/jet. We introduce super Gaussian profiles to model the density and velocity variations of the early stages of plume, coupled with the laws of fluid mechanics to define profile parameters. This new approach, models the velocity profile variation from near uniform, across the section at the release point to Gaussian some distance away. The comparisons show that experimental data agrees well with the computations.

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Memo

Memo:
Received date:2016-1-26;Accepted date:2016-4-25。
Corresponding author:Poojitha D. Yapa
Last Update: 2016-11-24