Airborne flow dynamics near free-falling bulk materials: CFD analysis from analytical pressure field

2021 ◽  
Vol 385 ◽  
pp. 1-11
Author(s):  
Rodrigo Xavier de Almeida Leão ◽  
Leandro Silva Amorim ◽  
Marcio Ferreira Martins ◽  
Humberto Belich Junior ◽  
Enrico Sarcinelli ◽  
...  
Keyword(s):  
Pressure Field ◽  
Flow Dynamics ◽  
Cfd Analysis ◽  
Bulk Materials ◽  
Free Falling

Experimental Investigation of Dust Amount from Free Falling Particle Stream Effected by Deflector Curvature of Dust Suppression

2013 ◽  
Vol 864-867 ◽  
pp. 1789-1792 ◽  
Author(s):  
Ze Qin Liu ◽  
Zhen Jing Wu ◽  
Ze Peng Feng
Keyword(s):  
Experimental Investigation ◽  
Dust Control ◽  
Emissions Reduction ◽  
Fugitive Dust ◽  
Bulk Materials ◽  
Dust Suppression ◽  
Suppression Effect ◽  
Particle Stream ◽  
Free Falling ◽  
The Relationship

This paper focuses on the study of the curvatures of deflector installed on the below receiving device to effect the dust amount from the free falling particle stream. The deflector curvature was artificially controlled to limit the fugitive dust direction which was generated by the collision between the free falling bulk materials and the receiving device. This method was used to improve efficiency of the dust control system to exhaust fugitive dust, and to achieve the targets of energy conservation and emissions reduction. The experimental method was adopted to explore the relationship between the deflector curvature and the producing dust quantity. The experimental results indicated that, the dust suppression effect containing deflector contained a certain radian was more remarkable, when the height of the free falling of bulk materials was constant. The producing dust quantity decreased slightly with the deflector curvature increasing, and then increased rapidly. When the deflector curvature was 0.045 cm-1 or 0.060cm-1, the minimum of producing dust quantity could be obtained, and the dust removal effect might be significant.

CFD Analysis on Similarity Criteria of Hydrodynamic Characteristics for Gravity-Installed Anchors

2019 ◽  
Author(s):  
Jiancai Gao ◽  
Haixiao Liu
Keyword(s):  
Model Testing ◽  
Model Tests ◽  
Similarity Criteria ◽  
Scale Model ◽  
Hydrodynamic Characteristics ◽  
Cfd Analysis ◽  
Cfd Simulations ◽  
Tests Of Gravity ◽  
Free Falling ◽  
Reduced Scale

Abstract For reduced-scale model tests of gravity-installed anchors (GIAs), it is of great significance to extrapolate the testing results to prototype. This highlights the necessity of investigation of similarity criteria. The present work aims to find the similarity criteria of three prioritized hydrodynamic characteristics including VT, HP, and Cd for GIAs during installation in water through CFD simulations. In the present study, free falling processes of different reduced-scale T98 anchor models and prototype anchor is simulated, from which VT, HP, and Cd are extracted and analyzed to get the fitting curves for these three characteristics over reduced-scale λ. Based on these curves, hydrodynamic characteristics for prototype and other reduced-scale model can be extrapolated from model testing results. And, the researching procedure in this paper sets an example and reference to study about similarity criteria for other hydrodynamic characteristics.

Application of CFD Analysis for Rotating Machinery: Part 1 — Hydrodynamic, Hydrostatic Bearings and Squeeze Film Damper

2003 ◽  
Author(s):  
Zenglin Guo ◽  
Toshio Hirano ◽  
R. Gordon Kirk
Keyword(s):  
Traditional Method ◽  
Reasonable Agreement ◽  
Pressure Field ◽  
Squeeze Film ◽  
Cfd Analysis ◽  
Complex Flow ◽  
Static And Dynamic Characteristics ◽  
Squeeze Film Damper ◽  
Squeeze Film Dampers ◽  
Machinery Part

The traditional method for bearing and damper analysis usually involves a development of rather complicated numerical calculation programs that may just focus on a simplified and specific physical model. The application of the general CFD codes may make this analysis available and effective where complex flow geometries are involved or when more detailed solutions are needed. In this study, CFX-TASCflow is employed to simulate various fixed geometry fluid-film bearing and damper designs. Some of the capabilities in CFX-TASCflow are applied to simulate the pressure field and calculate the static and dynamic characteristics of hydrodynamic, hydrostatic and hybrid bearings as well as squeeze film dampers. The comparison between the CFD analysis and current computer programs used in industry has been made. The results show reasonable agreement in general. Some of possible reasons for the differences are discussed. It leaves room for further investigation and improvement on the methods of computation.

Application of CFD Analysis for Rotating Machinery—Part I: Hydrodynamic, Hydrostatic Bearings and Squeeze Film Damper

2005 ◽  
Vol 127 (2) ◽  
pp. 445-451 ◽  
Author(s):  
Zenglin Guo ◽  
Toshio Hirano ◽  
R. Gordon Kirk
Keyword(s):  
Traditional Method ◽  
Reasonable Agreement ◽  
Pressure Field ◽  
Squeeze Film ◽  
Cfd Analysis ◽  
Complex Flow ◽  
Static And Dynamic Characteristics ◽  
Squeeze Film Damper ◽  
Squeeze Film Dampers ◽  
Machinery Part

The traditional method for bearing and damper analysis usually involves a development of rather complicated numerical calculation programs that may just focus on a simplified and specific physical model. The application of the general CFD codes may make this analysis available and effective where complex flow geometries are involved or when more detailed solutions are needed. In this study, CFX-TASCflow is employed to simulate various fixed geometry fluid-film bearing and damper designs. Some of the capabilities in CFX-TASCflow are applied to simulate the pressure field and calculate the static and dynamic characteristics of hydrodynamic, hydrostatic, and hybrid bearings as well as squeeze film dampers. The comparison between the CFD analysis and current computer programs used in industry has been made. The results show reasonable agreement in general. Some of the possible reasons for the differences are discussed. It leaves room for further investigation and improvement on the methods of computation.

1201 PC-MRI measurements and CFD analysis of blood flow dynamics in the human aorta

2005 ◽  
Vol 2005.5 (0) ◽  
pp. 143-144
Author(s):  
Suguru YOKOSAWA ◽  
Sigeo WADA ◽  
Ken-ichi TSUBOTA ◽  
Haruo ISODA ◽  
Hiroyasu Takeda ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Dynamics ◽  
Human Aorta ◽  
Cfd Analysis ◽  
Blood Flow Dynamics ◽  
Mri Measurements

Chaotic Flow Dynamics Investigated by 3D MRI and CFD Analysis

2016 ◽  
Vol 88 (9) ◽  
pp. 1280-1280
Author(s):  
M. Wiese ◽  
S. Benders ◽  
B. Blümich ◽  
M. Wessling
Keyword(s):  
Flow Dynamics ◽  
Cfd Analysis ◽  
3D Mri ◽  
Chaotic Flow

1A24 CFD Analysis for Upper Airway Flow Dynamics Before and After UPPP

2015 ◽  
Vol 2015.27 (0) ◽  
pp. 21-22
Author(s):  
Takaya Hirose ◽  
Kohki Kuroda ◽  
Takahisa Yamamoto ◽  
Seiichi Nakata ◽  
Naoko Fujii ◽  
...  
Keyword(s):  
Upper Airway ◽  
Flow Dynamics ◽  
Cfd Analysis ◽  
Before And After

Cavity and Protrusion Effects in a Single-Stage Compressor

2001 ◽  
Author(s):  
A. A. J. Demargne ◽  
J. P. Longley
Keyword(s):  
Secondary Flow ◽  
Diagnostic Tool ◽  
Pressure Field ◽  
Single Stage ◽  
Cfd Analysis ◽  
Linear Cascade ◽  
Stator Blade

The effect of opening a stator-shroud cavity to the mainstream (no net leakage), upstream of a moderately loaded stator is investigated in a single-stage research compressor. The investigations consist of a series of measurements and calculations, which reveal various inconsistencies in flow turning, secondary flow and blockage. CFD analysis is used as a diagnostic tool to show that the unexpected trends measured in the single-stage compressor can be attributed to the protrusion of the arrangement used to seal the cavity into the mainstream, disrupting the hub endwall flow into the stator passage. The CFD results on the single-stage compressor without protrusion confirm the trends observed in the linear cascade experiment relative to the effects of the upstream shroud cavity on the hub endwall flow and stator performance, in the presence of the stator blade pressure field. These results clearly illustrate the strong sensitivity of the performance of the stator row to small protrusions and cavities in the endwalls. Such effects are no longer negligible when compared to the level of resolution and sophistication achieved with current solvers.

411 CFD Analysis on Pressure Field around High Speed Moving Vehicle in Strong Wind

2007 ◽  
Vol 2007.20 (0) ◽  
pp. 559-560
Author(s):  
Minoru Sakata ◽  
Daisuke Nagai ◽  
Hisanori Ohara ◽  
Masataka Takano ◽  
Masafumi Morikami
Keyword(s):  
High Speed ◽  
Pressure Field ◽  
Strong Wind ◽  
Cfd Analysis ◽  
Moving Vehicle

A CFD analysis of the flow dynamics of a directly-operated safety relief valve

2018 ◽  
Vol 328 ◽  
pp. 321-332 ◽  
Author(s):  
N.L. Scuro ◽  
E. Angelo ◽  
G. Angelo ◽  
D.A. Andrade
Keyword(s):  
Flow Dynamics ◽  
Cfd Analysis ◽  
Relief Valve
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