scholarly journals Flow distribution analysis on the cooling tube network of ITER thermal shield

2014 ◽  
Author(s):  
Kwanwoo Nam ◽  
Wooho Chung ◽  
Chang Hyun Noh ◽  
Dong Kwon Kang ◽  
Kyoung-O Kang ◽  
...  
Keyword(s):  
Flow Distribution ◽  
Distribution Analysis ◽  
Thermal Shield ◽  
Cooling Tube

Flow distribution analysis by helical scanning in polysulfone hemodialyzers: Effects of fiber structure and design on flow patterns and solute clearances

2006 ◽  
Vol 10 (4) ◽  
pp. 380-388 ◽  
Author(s):  
Claudio RONCO ◽  
Nathan LEVIN ◽  
Alessandra BRENDOLAN ◽  
Federico NALESSO ◽  
Dinna CRUZ ◽  
...  
Keyword(s):  
Flow Distribution ◽  
Flow Patterns ◽  
Distribution Analysis ◽  
Fiber Structure ◽  
Structure And Design

Methodology Development for Transient Flow Distribution Analysis in High Temperature Gas-Cooled Reactor

2020 ◽  
Author(s):  
Takeshi Aoki ◽  
Hiroyuki Sato ◽  
Hirofumi Ohashi
Keyword(s):  
High Temperature ◽  
Hydraulic System ◽  
System Analysis ◽  
Molecular Diffusion ◽  
Transient Flow ◽  
Flow Distribution ◽  
Distribution Analysis ◽  
Design Improvement ◽  
Air Ingress ◽  
High Temperature Gas

Abstract In the thermal hydraulic design of the prismatic-type of the high temperature gas cooled reactor (HTGR), unintended flows such as gap flows between columns, cross flows between column layers and gap flows between permanent reflectors should be analyzed to minimizing the unintended flows. The flow distribution considering unintended flows in the reactor has been evaluated for steady and conservative condition. On the other hand, the transient thermal hydraulic analysis for satisfactorily realistic conditions will be helpful for the design improvement of prismatic-type HTGR. The present study aims to improve the thermal hydraulic system analysis code developed by Japan Atomic Energy Agency based on the RELAP5/MOD3 code and confirm its applicability for the transient flow distribution analysis for prismatic-type HTGRs during anticipated operational occurrences and accidents for its design improvement utilizing experiences on high temperature engineering test reactor (HTTR) design. The calculation model and code were developed and validated to evaluate the detailed flowrate distribution considering the unintended flows in the core and the molecular diffusion that is important to analyze beginning air ingress behavior in an air ingress accident triggered by a rupture of a primary coolant piping in HTGR. It is concluded that a prospect has confirmed to apply the improved thermal hydraulic system analysis code for transient flow distribution analysis for prismatic-type HTGRs.

scholarly journals Left Ventricular Flow Distribution as a Novel Flow Biomarker in Atrial Fibrillation

2021 ◽  
Vol 9 ◽  
Author(s):  
Hansuk Kim ◽  
Hana Sheitt ◽  
Stephen B. Wilton ◽  
James A. White ◽  
Julio Garcia
Keyword(s):  
Atrial Fibrillation ◽  
Systolic Function ◽  
Flow Distribution ◽  
Left Ventricular ◽  
Relative Reduction ◽  
Distribution Analysis ◽  
Healthy Controls ◽  
Direct Flow ◽  
End Diastolic Volume ◽  
Flow Components

Introduction: Four-dimensional (4-D) flow cardiac magnetic resonance imaging can be used to elegantly describe the hemodynamic efficiency of left ventricular (LV) flow throughout the cardiac cycle. Patients with nonvalvular paroxysmal atrial fibrillation (PAF) may have occult LV disease. Flow distribution analysis, based on 4-D flow, may unmask the presence of LV disease by assessing flow components: direct flow, retained flow, delayed ejection, and residual volume. This study aimed to identify LV hemodynamic inefficiencies in patients with PAF and normal systolic function. We hypothesized that the fraction of direct flow to the total end-diastolic volume would be reduced in patients with PAF compared with controls.Methods: We used 4-D LV flow component analysis to compare hemodynamics in 30 healthy controls and 50 PAF patients in sinus rhythm.Results: PAF subjects and healthy controls had similar LV mass, volume, and ejection fraction. Direct flow was lower in the PAF group than in the controls (44.5 ± 11.2% vs. 50.0 ± 12.2%, p = 0.042) while delayed ejection was higher in the PAF group (21.6 ± 5.6% vs. 18.6 ± 5.7%, p = 0.022).Conclusion: PAF patients demonstrated a relative reduction in direct flow and elevation in delayed ejection.

Air-Flow Distribution Simulation and Experimental Analysis of a New Testing Room for Refrigerated Display Cabinet

2012 ◽  
Vol 614-615 ◽  
pp. 701-706
Author(s):  
Chao Huang ◽  
Fang Wang ◽  
Zhi Min Wu ◽  
Chao Guo
Keyword(s):  
Cfd Simulation ◽  
Design Method ◽  
Air Flow ◽  
Flow Distribution ◽  
Simulation Software ◽  
Air Distribution ◽  
Distribution Analysis ◽  
Experiment System ◽  
Quality Regulation ◽  
Testing Room

Based on European Standard EN441-2, an experiment system for measuring the thermal properties of refrigerated display cabinet is designed and constructed. Considering the practice requirements from user, the air distribution analysis is doing under various air-flow form in the testing room. This paper uses the FLUENT, which is one of the CFD simulation software, to verify the design method of air movement. Finally a series of tests required for laboratory quality regulation have been done and the data of velocity or temperature is under the new requirement.

Acoustic Mask for Air Flow Distribution Analysis in Speech Therapy

2016 ◽  
pp. 377-387 ◽  
Author(s):  
Michał Kręcichwost ◽  
Zuzanna Miodońska ◽  
Joanna Trzaskalik ◽  
Julia Pyttel ◽  
Dominik Spinczyk
Keyword(s):  
Speech Therapy ◽  
Air Flow ◽  
Flow Distribution ◽  
Distribution Analysis

Flow Distribution Analysis in the SOFC Stack Using CFD Technique

2017 ◽  
Author(s):  
Cheng Zhao ◽  
Cun Wang ◽  
Tao Zhang ◽  
Jian Pu
Keyword(s):  
Three Dimensional ◽  
Flow Distribution ◽  
Structure Design ◽  
Geometric Parameters ◽  
Channel Structure ◽  
Distribution Analysis ◽  
Flow Uniformity ◽  
Gas Distributor ◽  
Inlet Tube ◽  
Computational Fluid Dynamics Cfd

In this paper, a three dimensional solid oxide fuel cell (SOFC) model is constructed to investigate the gas distribution and the pressure variation in the external manifold stack by a computational fluid dynamics (CFD) approach. Several geometric parameters of external manifold stack, including the position of inlet tube, depth of the manifold and the channel resistance are optimized to achieve uniform gas distributions among the channels. Simulation results indicate that a gas distributor can enhance the flow uniformity effectively. Besides, with the increasing depth of the manifold, the flow tends to be more uniform in T-manifold but has a small impact on C-manifold stack. It is also shown that flow distribution is intensively enhanced with the raise of resistance, especially from 0Pa to 100Pa. Modeling results highlight the importance of manifold and channel structure design for external manifold stack and can be widely applied to design the geometric parameters.

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