Development of a Numerical Analysis Method for Cross-sectional Void Fraction Distribution in Subchannels of Nuclear Fuel Assemblies

1998 ◽  
Vol 35 (3) ◽  
pp. 178-184
Author(s):  
Akihiko MINATO ◽  
Ichiro KOMATSU ◽  
Masaharu SAKAGAMI ◽  
Masao HIROSE
Keyword(s):  
Numerical Analysis ◽  
Nuclear Fuel ◽  
Void Fraction ◽  
Analysis Method ◽  
Cross Sectional ◽  
Numerical Analysis Method ◽  
Fuel Assemblies ◽  
Void Fraction Distribution ◽  
Fraction Distribution

High-Energy X-Ray CT Measurement of Void Fraction Distribution Around Part Length Rods in a Rod Bundle at High Pressure and Temperatures

2020 ◽  
Author(s):  
Takahiro Arai ◽  
Atsushi Ui ◽  
Masahiro Furuya ◽  
Riichiro Okawa ◽  
Tsugumasa Iiyama ◽  
...  
Keyword(s):  
Void Fraction ◽  
High Energy ◽  
Uniform Heat Flux ◽  
Two Phase ◽  
Cross Sectional ◽  
Rod Bundle ◽  
Wide Range ◽  
Void Fraction Distribution ◽  
Fraction Distribution ◽  
Heated Length

Abstract A boiling experiment was conducted to acquire a three-dimensional void fraction distribution in a rod bundle with part length rods. The test section was a 5 × 5 heated rod bundle that partially simulated a BWR rod bundle, and three PLRs were arranged together in the corner. The heated length of the full-length rod was 3.71 m, which is equal in length to an actual fuel rod in BWRs, whereas the heated length of the PLR was 1.85 m. The rod bundle exhibited an axially and radially uniform heat flux. Further, the local void fraction was quantified by normalizing the intensities in the CT images of the boiling two-phase flow with those obtained under the liquid-phase and gas-phase conditions. The cross-sectional void fraction distribution was acquired at six height levels. The experimental results exhibited the void distribution around PLRs with respect to a wide range of flow conditions, inlet temperatures, inlet flow rates, bundle thermal powers, and system pressures.

Dynamic Analysis of the Pipe Lifting Mechanism on the Deepwater Pipelaying Vessel

2011 ◽  
Vol 199-200 ◽  
pp. 251-256
Author(s):  
Kai An Yu ◽  
Ke Yu Chen
Keyword(s):  
Numerical Analysis ◽  
Dynamic Analysis ◽  
High Efficiency ◽  
Transport Systems ◽  
Kinematic Pair ◽  
Analysis Method ◽  
Numerical Analysis Method ◽  
Upper Limit ◽  
Lifting Capacity ◽  
Limit Position

Based on requirements of pipe transport systems on deepwater pipelaying vessel, a new pipe lifting mechanism was designed. It was composed of crank-rocker and rocker-slider mechanism with good lifting capacity and high efficiency. When the slider went to the upper limit position, the mechanism could approximatively dwell, meeting the requirement for transverse conveyor operation. According to the theory of dynamics, numerical analysis method was used to the dynamic analysis of the mechanism. The results showed the maximum counterforce was at the joint between the rocker and ground, and this calculation could be a guideline for the kinematic pair structure designing.

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