Recognition of two-phase flow patterns with the use of dynamic image analysis

2002 ◽  
Vol 216 (4) ◽  
pp. 227-233 ◽  
Author(s):  
R Ulbrich ◽  
M Krótkiewicz ◽  
N Szmolke ◽  
S Anweiler ◽  
M Masiukiewicz ◽  
...  
Keyword(s):  
Image Analysis ◽  
Two Phase Flow ◽  
Rectangular Channel ◽  
Research Work ◽  
Ccd Camera ◽  
Flow Patterns ◽  
Phase Flow ◽  
Two Phase ◽  
Channel Information ◽  
Dynamic Image Analysis

This research work aimed at developing techniques for the recognition of two-phase flow patterns using image analysis. Flow was realized in a flat rectangular channel. Information recorded with a CCD camera, was analysed using the authors' own software. The change in the grey level value from the recorded flow realizations was investigated. The results of this analysis allowed identification of the two-phase flow structures obtained. Stochastic analysis of the fluidization process was also carried out.

An Experimental Study on Liquid Film Dynamics and Interfacial Wave of Air-Water Two-Phase Flow in a Horizontal Channel

2013 ◽  
Author(s):  
Youjia Zhang ◽  
Weimin Ma ◽  
Shengjie Gong
Keyword(s):  
Liquid Film ◽  
Two Phase Flow ◽  
Rectangular Channel ◽  
Research Work ◽  
Water Film ◽  
Test Facility ◽  
Phase Flow ◽  
Interfacial Wave ◽  
Film Rupture ◽  
Two Phase

This study is concerned with liquid film dynamics and stability of annular flow, which plays an important role in understanding film rupture and dryout in boiling heat transfer. The research work starts from designing and making a test facility which enables the visualization and measurement of liquid film dynamics. A confocal optical sensor is applied to track the evolution of film thickness. A horizontal rectangular channel made of glass is used as the test section. Deionized water and air are supplied into that channel in such a way that an initial stratified flow forms, with the liquid film on the bottom wall. The present study is focused on characterization of liquid film profile and dynamics in term of interfacial wave and shear force induced film rupture under adiabatic condition. Based on the experimental data and analysis, it is found that given a constant water flowrate, the average thickness of water film decreases with increasing air flowrate, while the interfacial wave of the two-phase flow is intensified. As the air flowrate reaches a critical value, a localized rupture of the water film occurs.

scholarly journals Experimental study on vertically upward steam-water two-phase flow patterns in narrow rectangular channel

2021 ◽  
Vol 53 (1) ◽  
pp. 61-68
Author(s):  
Jiancheng Zhou ◽  
Tianzhou Ye ◽  
Dalin Zhang ◽  
Gongle Song ◽  
Rulei Sun ◽  
...  
Keyword(s):  
Experimental Study ◽  
Two Phase Flow ◽  
Rectangular Channel ◽  
Flow Patterns ◽  
Phase Flow ◽  
Two Phase

Photographic Study on Two-Phase Flow Patterns of Water in a Single-Side Heated Narrow Rectangular Channel

2010 ◽  
Author(s):  
Jun-Feng Wang ◽  
Yan-Ping Huang ◽  
Yan-Lin Wang
Keyword(s):  
Two Phase Flow ◽  
Flow Boiling ◽  
Rectangular Channel ◽  
Flow Patterns ◽  
Two Dimensions ◽  
Phase Flow ◽  
Two Phase ◽  
Single Side ◽  
Transition Criteria ◽  
Churn Flow

Visualized experimental observation on flow patterns during flow boiling of water under single-side heated and fluid-inlet subcooled conditions in a vertical narrow rectangular channel with the cross-section of 40×3mm2 have been carried out. Four discernible flow patterns which names dispersed bubbly, coalesced bubbly, churn flow and annular flow are obtained. Flow visualization in two dimensions of two-phase flow patterns for narrow rectangular channel, which provided clearer evidence to distinguish flow patterns, have been performed. Based on the experimental results, a flow pattern map for single-side heated narrow rectangular channel has been developed and then compared with the exiting maps and flow transition criteria.

Classification of natural circulation two-phase flow patterns using fuzzy inference on image analysis

2012 ◽  
Vol 250 ◽  
pp. 592-599 ◽  
Author(s):  
R.N. de Mesquita ◽  
P.H.F. Masotti ◽  
R.M.L. Penha ◽  
D.A. Andrade ◽  
G. Sabundjian ◽  
...  
Keyword(s):  
Image Analysis ◽  
Two Phase Flow ◽  
Fuzzy Inference ◽  
Natural Circulation ◽  
Flow Patterns ◽  
Phase Flow ◽  
Two Phase

Photographic Study on Two-Phase Flow Patterns of Water in a Single-Side Heated Narrow Rectangular Channel

2010 ◽  
Vol 133 (5) ◽  
Author(s):  
Junfeng Wang ◽  
Yanping Huang ◽  
Yanlin Wang
Keyword(s):  
Two Phase Flow ◽  
Flow Boiling ◽  
Rectangular Channel ◽  
Flow Patterns ◽  
Two Dimensions ◽  
Phase Flow ◽  
Two Phase ◽  
Single Side ◽  
Transition Criteria ◽  
Churn Flow

Visualized experimental observation on flow patterns during flow boiling of water under single-side heated and fluid-inlet subcooled conditions in a vertical narrow rectangular channel with the cross section of 40×3 mm2 have been carried out. Four discernible flow patterns, which names dispersed bubbly, coalesced bubbly, churn flow, and annular flow are observed. Flow visualization in two dimensions of two-phase flow patterns for narrow rectangular channel, which provided clearer evidence to distinguish flow patterns, have been performed. Based on the experimental results, a flow pattern map for single-side heated narrow rectangular channel has been developed and then compared with the exiting maps and flow transition criteria.

scholarly journals Application of Chaos Theory in Identification of Two-Phase Flow Patterns and Transitions in a Small, Horizontal, Rectangular Channel

1996 ◽  
Vol 118 (2) ◽  
pp. 383-390 ◽  
Author(s):  
Y. Cai ◽  
M. W. Wambsganss ◽  
J. A. Jendrzejczyk
Keyword(s):  
Chaos Theory ◽  
Two Phase Flow ◽  
Rectangular Channel ◽  
Pressure Fluctuations ◽  
Fractal Dimensions ◽  
Flow Patterns ◽  
Deterministic System ◽  
Phase Flow ◽  
Two Phase ◽  
Measurement Tools

Various measurement tools that are used in chaos theory were applied to analyze two-phase pressure signals with the objective of identifying and interpreting flow pattern transitions for two-phase flows in a small, horizontal rectangular channel. These measurement tools included power spectral density function, autocorrelation junction, pseudo-phase-plane trajectory, Lyapunov exponents, and fractal dimensions. It was demonstrated that the randomlike pressure fluctuations characteristic of two-phase flow in small rectangular channels are chaotic, and governed by a high-order deterministic system. The correlation dimension is potentially a new approach for identifying certain two-phase flow patterns and transitions.

scholarly journals ECT Image Recognition of Pipe Plugging Flow Patterns Based on Broad Learning System in Mining Filling

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Xuebin Qin ◽  
ChenChen Ji ◽  
Yutong Shen ◽  
Pai Wang ◽  
Mingqiao Li ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Research Work ◽  
Flow Patterns ◽  
Learning System ◽  
Stable Operation ◽  
Phase Flow ◽  
Two Phase ◽  
Fast Training ◽  
Optimization Parameters ◽  
Dimensional Section

The process of mining filling, when the slurry is transported to the goaf by the filling pipeline, is very important to find the location and size of the caking in the filling pipeline in time for the safe and stable operation of the mine filling pipeline. It is an important research work to detect different flow patterns after two-dimensional section reconstruction in closed filling pipeline based on ECT (electrical capacitance tomography) visualization method. Slurry flow in pipeline is regarded as a two-phase flow, and the multishape distribution was reconstructed into images by ECT and intelligently recognized by broad learning system (BLS) algorithm. BLS is a feedforward neural network with few optimization parameters and fast training speed. In this paper, three features of two-phase sample images, the number of regional blocks, the roundness of regional blocks, and barycenter of regional blocks, are combined with network structure of BLS to recognize different flow patterns. Through the simulation, the recognition accuracy of two-phase fillback image is more than 99%. This conclusion indicates the effectiveness of BLS to predict different two-phase flow patterns; it also provides a new solution for the pattern recognition of the flow pattern in the mining filling pipeline.

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