Nuclear Engineering Commons^™

Turbulent Gas Breakup Modeling And Acoustic Void-Fraction Determination Studies In Support Of Cavitation Damage Mitigation Of The Spallation Neutron Source Target Vessel, Stuart Alexander Walker

Doctoral Dissertations

Pressure pulses induced by proton beam deposition lead to cavitation and pitting erosion of the SNS target vessel; this damage limits the lifetime of the vessel. Dampening the pressure pulse by adding compressibility to the bulk mercury in the form of microbubbles is a promising technique for damage mitigation. The physics governing gas bubble breakup in turbulent flows is examined leading to mechanistic based scaling models for the gas breakup in a swirling jet type microbubble generator. These models are verified experimentally in an air/water system and compared to a legacy empirical model. Verifying the performance of a microbubble generator …

Quarterly Report For The Trp Project, March–June 2003, Samir Moujaes, Yitung Chen, Kanthi Kiran Daiska, Chao Wu

Transmutation Sciences Materials (TRP)

The MTL is assumed to be a 5m long rectangular loop with a circular cross-section. Because of the non-symmetry, and due to the active participation of the secondary flows due to the elbows present in the rectangular loop model, the geometry is considered as a 3D model.

When the regions of maximum corrosion and precipitation are compared, they fall in the same zone for both the analytical and simulated models. The reason for a larger concentration flux in the case of turbulent flow than for the laminar flow can be explained by the concept of higher lateral diffusion in the …

Modeling Corrosion In Oxygen Controlled Lbe Systems With Coupling Of Chemical Kinetics And Hydrodynamics-Task V: Final Report -Phase I 09/01/2001-08/30/2002, Samir Moujaes, Yitung Chen

Transmutation Sciences Materials (TRP)

The Lead-Bismuth eutectic (LBE) has been determined from previous experimental studies by the Russians and the European scientific community to be a potential material that can be used as a spallation target and coolant for the AAA proposed application. Properly controlling the oxygen content in LBE can drastically reduce the LBE corrosion to structural steels. However, existing knowledge of material corrosion performance was obtained from point-wise testing with only very sparse experimental data. Scientists have noticed that the concentration of oxygen dissolved in the liquid alloy could control the corrosion rate of steels exposed to Pb or Pb-Bi. At high …