A new method for simulating rigid body motion in incompressible two-phase flow

2010 ◽  
Vol 67 (6) ◽  
pp. 713-732 ◽  
Author(s):  
Jessica Sanders ◽  
John E. Dolbow ◽  
Peter J. Mucha ◽  
Tod A. Laursen
Keyword(s):  
Rigid Body ◽  
Two Phase Flow ◽  
Rigid Body Motion ◽  
Body Motion ◽  
New Method ◽  
Phase Flow ◽  
Two Phase

scholarly journals Clustering-Based Component Fraction Estimation in Solid–Liquid Two-Phase Flow in Dredging Engineering

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5697
Author(s):  
Chang Sun ◽  
Shihong Yue ◽  
Qi Li ◽  
Huaxiang Wang
Keyword(s):  
Clustering Algorithm ◽  
Two Phase Flow ◽  
Low Cost ◽  
Fast Response ◽  
New Method ◽  
Phase Flow ◽  
Reference Distribution ◽  
Two Phase ◽  
Long Time ◽  
Solid Liquid

Component fraction (CF) is one of the most important parameters in multiple-phase flow. Due to the complexity of the solid–liquid two-phase flow, the CF estimation remains unsolved both in scientific research and industrial application for a long time. Electrical resistance tomography (ERT) is an advanced type of conductivity detection technique due to its low-cost, fast-response, non-invasive, and non-radiation characteristics. However, when the existing ERT method is used to measure the CF value in solid–liquid two-phase flow in dredging engineering, there are at least three problems: (1) the dependence of reference distribution whose CF value is zero; (2) the size of the detected objects may be too small to be found by ERT; and (3) there is no efficient way to estimate the effect of artifacts in ERT. In this paper, we proposed a method based on the clustering technique, where a fast-fuzzy clustering algorithm is used to partition the ERT image to three clusters that respond to liquid, solid phases, and their mixtures and artifacts, respectively. The clustering algorithm does not need any reference distribution in the CF estimation. In the case of small solid objects or artifacts, the CF value remains effectively computed by prior information. To validate the new method, a group of typical CF estimations in dredging engineering were implemented. Results show that the new method can effectively overcome the limitations of the existing method, and can provide a practical and more accurate way for CF estimation.

Distinguish the Pattern of Two-Phase Flow with the Technology of Acoustic Emission

2013 ◽  
Vol 816-817 ◽  
pp. 502-505
Author(s):  
Li De Fang ◽  
Yao Zhang ◽  
Wan Ling Zhang ◽  
Qing He ◽  
Yu Jiao Liang
Keyword(s):  
Acoustic Emission ◽  
Two Phase Flow ◽  
New Technology ◽  
Bubbly Flow ◽  
Flow Patterns ◽  
New Method ◽  
Good Effect ◽  
Phase Flow ◽  
Two Phase ◽  
Horizontal Pipe

This paper has propose a new method (acoustic emission) to distinguish the pattern of gas-liquid two-phase flow in the horizontal pipe. The signals which got from the probe when multiphase flow pattern changes in the pipe and the four probe installed on the different position. Through the analysis of time domination, energy of wavelet, collected the signal features and shows there has a significant differences among the three typical flow patterns (bubbly flow, stratified flow, annular flow). Energy of wavelet can clearly represents the signal strength. This paper found that the acoustic emission as a new method to distinguish flow patterns have good effect can as a new technology for the study of gas-liquid two-phase.

Planar Circle-Point Equations for Finitely Separated and Double-Point Positions

1998 ◽  
Vol 123 (1) ◽  
pp. 157-160
Author(s):  
Hyoung Jun Kim ◽  
Raj S. Sodhi
Keyword(s):  
Rigid Body ◽  
Double Point ◽  
Rigid Body Motion ◽  
Body Motion ◽  
New Method ◽  
Planar Mechanisms ◽  
Point Position ◽  
Point Curve ◽  
New Form ◽  
Position Problem

The rigid body motion is studied for a combination of finitely and infinitesimally separated positions in planar kinematics. A general new method is developed for determining the locations of points in a rigid body moving through finitely and infinitesimally separated positions. These points would satisfy the constraints of the crank links for planar mechanisms. A new form of the circle-point curve equations is derived for the double-point position problem and also for the finitely separated position problem in planar kinematics.

A New Method for the Online Voidage Measurement of the Gas–Oil Two-Phase Flow

2009 ◽  
Vol 58 (5) ◽  
pp. 1571-1577 ◽  
Author(s):  
Xia Li ◽  
Zhiyao Huang ◽  
Baoliang Wang ◽  
Haiqing Li
Keyword(s):  
Two Phase Flow ◽  
New Method ◽  
Phase Flow ◽  
Gas Oil ◽  
Two Phase

Air System Correlations: Part 1 — Labyrinth Seals

1998 ◽  
Author(s):  
H. Zimmermann ◽  
K. H. Wolff
Keyword(s):  
Two Phase Flow ◽  
New Method ◽  
Phase Flow ◽  
Labyrinth Seals ◽  
Two Phase ◽  
Air System

Three important subjects of the physics of air systems have been chosen, Part 1: Labyrinth Seals Part 2: Rotating Holes and Two Phase Flow as in these fields many new papers, partly controversial, are available. A new method of correlating the throughflow for labyrinth seals is generated, it covers the most important parameters and is based on several sources out of the literature. Recommendations for the necessary further research are added. It is concluded that much more effort is required in order to achieve progress against the literature partly consisting of more than 40-year-old books and not comprehensive enough for computerized engineering.

Availability Ratio for Performance of Pipeline Components in Two-Phase Flow

1978 ◽  
Vol 100 (3) ◽  
pp. 350-352 ◽  
Author(s):  
R. F. Harrison ◽  
R. B. Dean
Keyword(s):  
Steady Flow ◽  
Two Phase Flow ◽  
New Method ◽  
Phase Flow ◽  
Two Phase ◽  
Power Turbine ◽  
Availability Ratio

A new method is presented which uses the steady flow availability function to analyze the efficiency with which energy can be transmitted in a pipeline. It is suggested that the availability approach can be used to compare the performance of all types of pipeline component such as bends, diffusers, etc., and their effect on the power available at the power turbine.

New Method to Determine the Velocities of Particles on a Solid Propellant Surface in a Solid Rocket Motor

2005 ◽  
Vol 127 (9) ◽  
pp. 1057-1061 ◽  
Author(s):  
Yumin Xiao ◽  
R. S. Amano ◽  
Timin Cai ◽  
Jiang Li
Keyword(s):  
Boundary Conditions ◽  
Combustion Chamber ◽  
Solid Propellant ◽  
Two Phase Flow ◽  
New Method ◽  
Phase Flow ◽  
Solid Rocket Motor ◽  
Two Phase ◽  
Solid Rocket ◽  
Propellant Surface

Use of aluminized composite solid propellants and submerged nozzles are common in solid rocket motors (SRM). Due to the generation of slag, which injects into a combusted gas flow, a two-phase flow pattern is one of the main flow characteristics that need to be investigated in SRM. Validation of two-phase flow modeling in a solid rocket motor combustion chamber is the focus of this research. The particles’ boundary conditions constrain their trajectories, which affect both the two-phase flow calculations, and the evaluation of the slag accumulation. A harsh operation environment in the SRM with high temperatures and high pressure makes the measurement of the internal flow field quite difficult. The open literature includes only a few sets of experimental data that can be used to validate theoretical analyses and numerical calculations for the two-phase flow in a SRM. Therefore, mathematical models that calculate the trajectories of particles may reach different conclusions mainly because of the boundary conditions. A new method to determine the particle velocities on the solid propellant surface is developed in this study, which is based on the x-ray real-time radiography (RTR) technique, and is coupled with the two-phase flow numerical simulation. Other methods imitate the particle ejection from the propellant surface. The RTR high-speed motion analyzer measures the trajectory of the metal particles in a combustion chamber. An image processing software was developed for tracing a slug particle path with the RTR images in the combustion chamber, by which the trajectories of particles were successfully obtained.

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