scholarly journals Analysis of flow distribution uniformity of parallel tube sets with radial inlet

2021 ◽  
Vol 39 ◽  
pp. 69-74
Author(s):  
Xiaojun Zhou ◽  
Si Qin ◽  
Dongdi Liu ◽  
Kangjia Du
Keyword(s):  
Flow Distribution ◽  
Parallel Tube ◽  
Distribution Uniformity

Computer-Aided Design of a Cleanroom Ceiling Plenum System with a Limited Space for HVAC Equipment

1999 ◽  
Vol 42 (6) ◽  
pp. 34-39 ◽  
Author(s):  
Ting-Kwo Lei ◽  
Andrew Manning ◽  
Felix Kersting
Keyword(s):  
Flow Field ◽  
Computational Fluid Dynamic ◽  
Computer Aided Design ◽  
Fluid Dynamic ◽  
Flow Distribution ◽  
Velocity Fields ◽  
Computer Aided ◽  
Distribution Uniformity ◽  
Aided Design ◽  
Number Of Cells

Acommercial Computational Fluid Dynamic (CFD) software program was used to analyze the flow field inside a cleanroom ceiling plenum. The design required restricted space for the HVAC equipment. The effect of the number of cells used in the computational model on the simulation output was investigated. Pressure and velocity fields were examined. A comparison of flow distribution uniformity between a reference ceiling plenum system and a ceiling plenum system containing more ducted air supplies was made. An analysis of the effect of diffusion plates was conducted.

Numerical Simulation of Electrical Performance and Distribution of SOFC Stacks With Different Manifold Arrangement

2020 ◽  
Author(s):  
Quan Hou ◽  
Yuhua Wu ◽  
Haokun Liu ◽  
Xinhai Xu ◽  
Ben Xu
Keyword(s):  
Temperature Distribution ◽  
Numerical Model ◽  
Current Density ◽  
Three Dimensional ◽  
Flow Distribution ◽  
Electrical Performance ◽  
Fuel Cell Stack ◽  
Individual Unit ◽  
Distribution Uniformity ◽  
Sofc Stacks

Abstract In this study, a three-dimensional solid oxide fuel cell stack numerical model was developed and validated by experimental data. Five-cell SOFC stacks with different inlet and outlet manifold arrangement were investigated employing the numerical model. The stack polarization curve, current density, temperature, and flow distributions were analyzed. The results show that the effect of different manifold arrangement is almost neglected on the polarization curves and flow distribution. However, the current density and temperature distribution in individual unit of the stack can be influenced by the locations of inlets and outlets in the manifolds. Considering current density and temperature distribution uniformity as well as ease manufacturing and installation, the manifold arrangement with inlets at the top and outlets at the bottom for both fuel and air is recommended for SOFC stacks.

Improvement of Performance on Flow-Cutoff of Flap Valves Set in the Pressurized Tank of Pumping Station Based on Numerical Simulation

2013 ◽  
Vol 419 ◽  
pp. 86-90
Author(s):  
Yong Hai Yu ◽  
Bin Cheng
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Large Scale ◽  
Axial Flow ◽  
Free Water ◽  
Flow Distribution ◽  
Pumping Station ◽  
Simplec Algorithm ◽  
Distribution Uniformity ◽  
Free Plane

Two small flap valves arranged in parallel for each pump were used as flow-cutoff device in certain large-scale axial flow pumping station where the pressurized tank was designed as outlet structure. The flap valves of side-set pump had the poorest performance on flow-cutoff in the pumping station. The flow field in the pressurized tank was shown based on numerical simulation in order to improve the flow-cutoff performance of flap valves. The standard k-ε turbulence model and momentum equations were solved in the SIMPLEC algorithm with the assumption that the free water surface remained flat as a stress-free plane of symmetry. The velocity distribution and free outflow were prescribed on inlet and outlet boundary respectively. Numerical simulation on the flow field in pressurized tank was done at three typical moments chosen in the basis of the flow variation in the process of shutdown of flap valves. The reason that two flap valves of side-set pump could not close simultaneously and the late closing flap valve had a huge force on the wall was analyzed based on the comparison of flow field for side-set pump and middle-set pump. The result from numerical simulation proves that the division pier with appropriate size which helps to improve the flow distribution uniformity is valid for the two flap valves of side-set pump to close simultaneously.

Numerical study on the flow distribution uniformity in angled and curved manifolds

2017 ◽  
Vol 24 (4) ◽  
pp. 1891-1898 ◽  
Author(s):  
Farzane Najari Sohzabi ◽  
Elham Omidbakhsh Amiri
Keyword(s):  
Numerical Study ◽  
Flow Distribution ◽  
Curved Manifolds ◽  
Distribution Uniformity
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