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A Numerical Study on the Gravity Outflow of Oil from a Non-Pressurized Underwater Pipe
Song, Museok The Korean Association of Ocean Science and Techno 2006 Journal of Ocean Science and Technology Vol.3 No.1
A two-dimensional numerical method for inviscid two-fluid flows having a significant entrainment into both directions is established, and the oil leakage from a non-pressurized underwater pipe is studied in the Boussinesq limit. The interface between two fluids is modeled as a vortex sheet, and the flow field with the subsequent interface evolution is solved by using the vortex-in-cell/front-tracking method, For a longer flow simulation with a realistic two fluids interaction, an efficient merging scheme is introduced. The flow in the pipe during the leak is basically lock-exchange and the speed of the external fluid's intrusion into the pipe is very close to the existing mathematical models even with a significant interfacial roll-up and entrainments.
Investigation of the Flow Generated by an Intermittent Hydraulic Jet Circulater
Song, Museok,Seo, Dongil The Korean Association of Ocean Science and Techno 2004 Journal of Ocean Science and Technology Vol.1 No.2
While various types of aerating devices are being used to destroy the thermal stratifications in lakes, the proper design of such systems is the key to the successful and efficient mixing of the target water volume. Here, the flow characteristics of an intermittent hydraulic jet circulator (IHJC), which is commonly used in Korea, are investigated by using model experiments. In order for the flow to be intermittent and sluggish a proper divider must be employed in the air chamber and the volume of the chamber should be larger than ($\\rhoi$ D$\^3$/12) where D is cylinder diameter. By modifying the configuration of the air chamber and lower guide the favorable instantaneousair discharge can be achieved. The exit flow velocity is approximately 0.35\sqrt{(\rho _c - \rho _d)gD/\rho _c} slower than the leading sluggish bubble speed, where $\rho_c$ and $\rho_d$ are densities of water and bubble, respectively. Based on the experimental observations, a simple mathematical model is proposed to predict the performance of IHJC. The model predicts quantitatively accurate exit velocity compared to experimental measurements. Obtained information is believed to provide key parameters for better systematic design of JHJC both maximizing the effectiveness and enhancing the efficiency.