DEVELOPMENT AND NUMERICAL ANALYSIS TO VISUALISE THE FLOW PATTERN OF CRYOGENIC RADIAL TURBINE FOR HELIUM GAS

2018 ◽  
Author(s):  
Manoj Kumar ◽  
R.K. Sahoo
Keyword(s):  
Numerical Analysis ◽  
Flow Pattern ◽  
Radial Turbine ◽  
Helium Gas

Experiment and Numerical Analysis of Control Method of Natural Circulation by Injection of Helium Gas

2013 ◽  
Author(s):  
Naoto Yanagawa ◽  
Masashi Nomura ◽  
Tetsuaki Takeda ◽  
Shumpei Funatani
Keyword(s):  
Numerical Analysis ◽  
Mole Fraction ◽  
Pressure Vessel ◽  
Control Method ◽  
Natural Circulation ◽  
Circulation Flow ◽  
Helium Gas ◽  
Air Ingress ◽  
The One ◽  
Reactor Pressure

This study is to investigate a control method of the natural circulation of the air by the injection of helium gas. A depressurization is the one of the design-basis accidents of a Very High Temperature Reactor (VHTR). When the primary pipe rupture accident occurs in the VHTR, the air is predicted to enter into the reactor pressure vessel from the breach and oxidize in-core graphite structures. Finally, it seems to be probable that the natural circulation flow of the air in the reactor pressure vessel produce continuously. In order to predict or analyze the air ingress phenomenon during the depressurization accident of the VHTR, it is important to develop the method for prevention of air ingress during the accident. In this study, the air ingress process is discussed by comparing the experimental and analytical results of the reverse U-shaped channel which has parallel channels. The experiment of the natural circulation using a circular tube consisted of the reverse U-shaped type has been carried out. The vertical channel is consisted of the one side heated and the other side cooled pipe. The experimental apparatus is filled with the air and one side vertical tube is heated. A very small amount of helium gas is injected from the top of the channel. The velocity and the mole fraction of each gas are also calculated by using heat and mass transfer numerical analysis of multi-component gas. The result shows that the numerical analysis is considered to be well simulated the experiment. The natural circulation of the air has very weak velocity after the injection of helium gas. About 780 seconds later, the natural circulation suddenly produces. The natural circulation flow of the air can be controlled by the method of helium gas injection. The mechanism of the phenomenon is found that mole fraction is changed by the molecular diffusion and the very weak circulation.

scholarly journals Numerical Analysis of Flow Pattern by Outflow Gates with Manifold Channel

2011 ◽  
Vol 23 (1) ◽  
pp. 43-49
Author(s):  
Nam-Hyeong Kim ◽  
Chang-Lym Lee ◽  
Bon-Soo Ku ◽  
Man-Soon Song
Keyword(s):  
Numerical Analysis ◽  
Flow Pattern

Numerical Analysis of Dual-Flow Fields in Mini-TBM for Chinese LiPb Experimental Loop Dragon-IV

2010 ◽  
Author(s):  
Wei-hua Wang ◽  
Zhi-qiang Zhu ◽  
Qun-ying Huang ◽  
Xin-zhen Ling ◽  
Jin-ling Li
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Gas Flow ◽  
Flow Fields ◽  
Three Dimensions ◽  
Temperature Fields ◽  
Liquid Lithium ◽  
Flow And Heat Transfer ◽  
Helium Gas ◽  
Joint Contribution

Mini-TBM will be tested in chinese LiPb experimenttal loop Dragon-IV to validate the thermal-hydraulic effect of DFLL-TBM, such as dual-flow fields heat transfer, temperature fields, velocity fields, flux distribution of liquid lithium lead and helium gas. It is difficult to measure the detailed dual-flow fields of liquid metal LiPb and helium gas in mini-TBM. Three dimensions numerical analysis of the LiPb and helium gas flow and heat transfer in Mini-Test Blanket Module (TBM) therefore has been carried out using the CFD code FLUENT. The detailed dual-flow fields, which include temperature, velocity, pressure and heat transfer of liquid LiPb and helium gas, are presented to support for the test of mini-TBM, and to supply more robust database and make a significant joint contribution to the future TBM testing in EAST and ITER, and also optimize and improve the design of DFLL-TBM system for ITER.

A numerical analysis of the aortic blood flow pattern during pulsed cardiopulmonary bypass

2014 ◽  
Vol 18 (14) ◽  
pp. 1574-1581 ◽  
Author(s):  
V. Gramigna ◽  
M.V. Caruso ◽  
M. Rossi ◽  
G.F. Serraino ◽  
A. Renzulli ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cardiopulmonary Bypass ◽  
Numerical Analysis ◽  
Flow Pattern ◽  
Aortic Blood Flow ◽  
Blood Flow Pattern ◽  
Aortic Blood
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