DEM-CFD simulation of purge gas flow in a solid breeder pebble bed

2016 ◽  
Vol 113 ◽  
pp. 288-292 ◽  
Author(s):  
Hao Zhang ◽  
Zhenghong Li ◽  
Haibing Guo ◽  
Minyou Ye ◽  
Hongwen Huang
Keyword(s):  
Gas Flow ◽  
Cfd Simulation ◽  
Pebble Bed ◽  
Purge Gas

DEM-CFD Study of Purge Gas Flow in Pebble Bed of WCCB for CFETR

2017 ◽  
Author(s):  
Youhua Chen ◽  
Lei Chen ◽  
Songlin Liu
Keyword(s):  
Pressure Drop ◽  
Gas Flow ◽  
Flow Characteristics ◽  
Diameter Ratio ◽  
Pebble Bed ◽  
Ratio Requirement ◽  
Packing Factor ◽  
Test Reactor ◽  
Purge Gas ◽  
Cfd Method

As one of the breeding blanket candidates for China Fusion Engineering Test Reactor (CFETR), the water-cooled ceramic blanket (WCCB) was proposed to use mono-sized beryllium pebble bed and binary mixed Li2TiO3/Be12Ti pebble bed in order to increase the packing factor and meet the tritium breeding ratio requirement. Helium (mixed with 0.1% content of H2) is used as the purge gas to sweep tritium out when it flows through the pebble beds. Purge gas flow characteristics are of great importance to tritium recovery system design and will dominate the tritium sweep capability. In this study, DEM-CFD method was used to study the flow characteristics including porosity distribution, velocity distribution and pressure drop in the pebble beds. Mono-sized pebble bed with a packing factor of 0.61 and binary mixed pebble beds with the diameter ratio of 6:1, packing factor of 0.755, and diameter ratio of 7:1, packing factor of 0.7513 were simulated. This method can be used to study the detailed flow characteristics in pebble beds and optimize the pebble bed packing parameters to obtain an appropriate pressure drop, and could be extended to study tritium sweep capability for the design of fusion blanket.

Simulation and experimental analysis of purge gas flow characteristic for pebble bed

2021 ◽  
Vol 172 ◽  
pp. 112778
Author(s):  
Chirag Sedani ◽  
Maulik Panchal ◽  
Paritosh Chaudhuri
Keyword(s):  
Experimental Analysis ◽  
Gas Flow ◽  
Flow Characteristic ◽  
Pebble Bed ◽  
Purge Gas

Analysis of a Virtual Prototype First-Stage Rotor Blade Using Integrated Computer-Based Design Tools

2006 ◽  
Author(s):  
Michel Arnal ◽  
Christian Precht ◽  
Thomas Sprunk ◽  
Tobias Danninger ◽  
John Stokes
Keyword(s):  
Heat Transfer ◽  
Gas Flow ◽  
Thermal Loading ◽  
Cfd Simulation ◽  
Three Dimensional ◽  
Life Assessment ◽  
Element Analysis ◽  
Pressure Losses ◽  
Cooling Channels ◽  
Internally Cooled

The present paper outlines a practical methodology for improved virtual prototyping, using as an example, the recently re-engineered, internally-cooled 1st stage blade of a 40 MW industrial gas turbine. Using the full 3-D CAD model of the blade, a CFD simulation that includes the hot gas flow around the blade, conjugate heat transfer from the fluid to the solid at the blade surface, heat conduction through the solid, and the coolant flow in the plenum is performed. The pressure losses through and heat transfer to the cooling channels inside the airfoil are captured with a 1-D code and the 1-D results are linked to the three-dimensional CFD analysis. The resultant three-dimensional temperature distribution through the blade provides the required thermal loading for the subsequent structural finite element analysis. The results of this analysis include the thermo-mechanical stress distribution, which is the basis for blade life assessment.

CFD Investigation of helium gas flow in sphere packed (Pebble bed) in a rectangular canister using OpenFOAM

2021 ◽  
Vol 172 ◽  
pp. 112858
Author(s):  
Pratyush Kumar ◽  
Abhishek Thakur ◽  
Sandip K. Saha ◽  
Atul Sharma ◽  
Deepak Sharma ◽  
...  
Keyword(s):  
Gas Flow ◽  
Pebble Bed ◽  
Helium Gas

scholarly journals B205 Engineering study of gas flow in breeder pebble bed for fusion blanket

2012 ◽  
Vol 2012.17 (0) ◽  
pp. 265-266
Author(s):  
Yohji SEKI ◽  
Akira YOSHIKAWA ◽  
Hisashi TANIGAWA ◽  
Takanori HIROSE ◽  
Koichiro EZATO ◽  
...  
Keyword(s):  
Gas Flow ◽  
Pebble Bed ◽  
Engineering Study

scholarly journals Thermal Diffusion Performance of a Diffuser by various Guide Vanes configurations

2018 ◽  
Vol 225 ◽  
pp. 03018
Author(s):  
Aja O. Chikere ◽  
Hussain H. Al-Kayiem ◽  
Zainal Ambri A. Karim
Keyword(s):  
Gas Flow ◽  
Cfd Simulation ◽  
Bench Mark ◽  
Ansys Fluent ◽  
Guide Vanes ◽  
Pressure Losses ◽  
Fluent Software ◽  
Thermal Diffuser ◽  
Crosssectional Area ◽  
Large Diffusion

The use of vane-less diffuser with large diffusion angle has shown a setback in the diffusion process of high temperature working fluids. The hot gas flow was characterized as a jet-like flow. This paper presents problem, encountered practically, using a vane-less diffuser with large diffusion angle and how the problem is solved by CFD simulation. The investigated thermal diffuser has a length of 0.3 m, an inlet to outlet crosssectional area ratio of 1:25 and diffusion angle of 115.44o. To resolve the jet-like flow problem and poor distribution of the flow temperature at the diffuser outlet, the study suggested the use of guide-vanes into the diffuser. The study employed CFD simulation by ANSYS-FLUENT software to analyze the flow and thermal process in the diffuser. Three different shapes of guide vanes; block-shaped, oval-shaped and airfoil-shaped were considered in this study and at different vanes diffusion angles, as well as vane-less case, which was adopted as the bench mark case. The simulation results of the velocity, temperature and pressure at the diffuser outlet were compared for all cases. It was found that the guide vanes with symmetrical airfoil profile provided the best performance with most uniform distribution at the outlet of the diffuser. Also, the airfoil-shaped guide vanes resulted in lower pressure losses compared to the block-shaped and oval-shaped guide vanes. According to the analysis results, the diffuser was redesigned to improve the diffusion and temperature distribution across the diffuser outlet.

Experimental Visualization and Numerical Simulation of Liquid-Gas Two-Phase Flows in a Horizontal Pipe

2017 ◽  
Author(s):  
Milad Darzi ◽  
Chanwoo Park
Keyword(s):  
Numerical Simulation ◽  
Gas Flow ◽  
Cfd Simulation ◽  
Glass Tube ◽  
Flow Patterns ◽  
Two Phase Flows ◽  
Two Phase ◽  
Mixture Flow ◽  
Horizontal Pipe ◽  
Flow Rates

This paper presents the results of both visualization experiment and numerical simulation for two-phase (water-air mixture) flows in a horizontal tube. A visualization experimental setup was used to observe various two-phase flow patterns for different flow rates of water/air mixture flow in a glass tube of 12 mm in diameter. Total of 303 experimental data points were compared with Mandhane’s flow map. Most of the data for stratified, plug and slug flows were found to be in good agreement. However, annular flow was observed for relatively lower gas flow rates and also wavy flow occurred at relatively higher liquid flow rates in this experiment. A three-dimensional Computational Fluid Dynamics (CFD) simulation was performed using OpenFOAM employing “interFoam” as the solver to simulate the two-phase flows in horizontal pipe based on Volume-Of-Fluid (VOF) method. The simulated and experimentally observed flow patterns for the same set of superficial velocities shows acceptable similarities for stratified, wavy, plug, slug and annular flows. Also, the computed values of the void fraction and pressure drop for the numerical simulations shows reasonable agreement with well-known correlations in literature.

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