Numerical investigation on the effect of sudden contraction on flow behavior in a 90-degree bend

2017 ◽  
Vol 22 (2) ◽  
pp. 603-612
Author(s):  
Rasoul Daneshfaraz ◽  
Ali Rezazadehjoudi ◽  
John Abraham
Keyword(s):  
Numerical Investigation ◽  
Flow Behavior ◽  
Sudden Contraction

Numerical Investigation of Blood Flow Behavior in Different Orders of Vascular System

CHEST Journal ◽  
2012 ◽  
Vol 142 (4) ◽  
pp. 840A
Author(s):  
Houman Tammadon ◽  
Mehrdad Behnia ◽  
Leonard Kritharides ◽  
Masud Behnia
Keyword(s):  
Blood Flow ◽  
Numerical Investigation ◽  
Vascular System ◽  
Flow Behavior

Flow Behavior of PTT Viscoelastic Fluid in Sudden Contraction channel

2010 ◽  
Author(s):  
Hong-jun Yin ◽  
Hong-liang Zhou ◽  
Hui-ying Zhong ◽  
Wei-li Yang
Keyword(s):  
Viscoelastic Fluid ◽  
Flow Behavior ◽  
Sudden Contraction

Numerical Investigation of the Compressible Flow Through a Turbine Center Frame Duct

2018 ◽  
Author(s):  
Li-Wei Chen ◽  
Christian Wakelam ◽  
Jonathan Ong ◽  
Andreas Peters ◽  
Andrea Milli ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Mach Number ◽  
Numerical Investigation ◽  
Compressible Flow ◽  
Flow Behavior ◽  
Computational Domain ◽  
Turbulent Structures ◽  
Curvature Effects ◽  
Eddy Simulation ◽  
Static Pressure Distribution

Numerical investigation of the compressible flow in the Turbine Center Frame (TCF) duct was carried out using a Reynolds-averaged Navier-Stokes (RANS) method, and a Hybrid RANS/Large Eddy Simulation (HLES) method, i.e. Stress-Blended Eddy Simulation (SBES). The reference Reynolds number based on the TCF inlet condition is 530,000, and the inlet Mach number is 0.41. It is found that the boundary layer flow behavior is very sensitive to the incoming turbulence characteristics, so the upstream grid used to generate turbulence in the experiment is also included in the computational domain. Results have been validated carefully against experimental data, in terms of static pressure distribution on hub and casing walls, total pressure and Mach number profiles on the TCF measurement planes, as well as over-all pressure loss coefficient. Further, various fundamental mechanisms dictating the intricate flow phenomena, including concave and convex curvature effects, interactions between inlet turbulent structures and boundary layer, and turbulent kinetic energy budget, have been studied systematically. The current study is to evaluate the performance of HLES method for TCF flows and develop a further understanding of unsteady flow physics in the TCF duct. The results obtained in this work provide physical insight into the mechanisms relevant to the turbine intercase or TCF duct flows subjected to complex inlet disturbances.

scholarly journals Numerical investigation of turbulent flow behavior of sand particles in core shooting process

2019 ◽  
Vol 37 ◽  
pp. 182-189
Author(s):  
Lele Tong ◽  
Xu Shen ◽  
Jianxin Zhou ◽  
Yajun Yin ◽  
Xiaoyuan Ji
Keyword(s):  
Turbulent Flow ◽  
Numerical Investigation ◽  
Flow Behavior ◽  
Sand Particles ◽  
Core Shooting Process

Numerical Investigation of a Cryogenic Liquid Turbine Performance and Flow Behavior

2008 ◽  
Author(s):  
Wei Zhao ◽  
Jinju Sun ◽  
Hezhao Zhu ◽  
Cheng Li ◽  
Guocheng Cai ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Large Scale ◽  
Flow Behavior ◽  
Cryogenic Liquid ◽  
Air Separation ◽  
Design Flow ◽  
Suction Surface ◽  
Navier Stokes Equation ◽  
Separation Unit ◽  
Turbine Performance

A single stage cryogenic liquid turbine is designed for a large-scale internal compression air-separation unit to replace the Joule-Thompson valve and recover energy from the liquefied air during throttling process. It includes a radial vaned nozzle, and 3-dimensional impeller. Numerical investigation using 3-D incompressible Navier-Stokes Equation together with Spalart-Allmaras turbulence model and mixing plane approach at the impeller and stator interface are carried out at design and off-design flow. At design condition, recovered shaft power has amounted to 185.87 kW, and pressure in each component decreases smoothly and reaches to the expected scale at outlet. At small flow rates, flow separation is observed near the middle section of blade suction surface, which may cause local vaporization and even cavitation. To further improve the turbine flow behavior and performance, geometry parametric study is carried out. Influence of radial gap between impeller and nozzle blade rows, and nozzle stagger angle on turbine performance are investigated and clarified. Results arising from the present study provide some guidance for cryogenic liquid turbine optimal design.

Numerical investigation of flow behavior and film thickness in the single screw expander

2021 ◽  
Vol 190 ◽  
pp. 106047
Author(s):  
Xianfei Liu ◽  
Hui Zhang ◽  
Fang Wang ◽  
Guodong Xia ◽  
Zhiqiang Li ◽  
...  
Keyword(s):  
Film Thickness ◽  
Numerical Investigation ◽  
Flow Behavior ◽  
Single Screw
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