Investigation of the inner structure of gas–liquid flow in airlift pumps by laser‐high speed visualization technology

2020 ◽  
Vol 15 (5) ◽  
Author(s):  
Zhineng Wang ◽  
Yongping Jin ◽  
Fei Huang
Keyword(s):  
Liquid Flow ◽  
High Speed ◽  
Visualization Technology ◽  
Gas Liquid Flow

Experimental Study on Flow Patterns and Pressure Drop of Decaying Swirling Gas-Liquid Flow in a Vertical Pipe

2020 ◽  
Author(s):  
Jiarong Zhang ◽  
Li Liu ◽  
Shuai Liu ◽  
Hanyang Gu
Keyword(s):  
Pressure Drop ◽  
Flow Regime ◽  
Liquid Flow ◽  
High Speed ◽  
Phase Distribution ◽  
Swirling Flow ◽  
Tangential Velocity ◽  
High Speed Camera ◽  
Vertical Pipe ◽  
Gas Liquid Flow

Abstract Vertical swirling gas-liquid flow is a kind of complex two-phase flow containing a nonzero tangential velocity component in engineering applications. The accurate flow regime characterization, phase distribution information and pressure drop data about vertical swirling flow are the basis for the optimization of steam generator (SG), which can greatly reduce the cost and improve the safety of nuclear plants. To get these key parameters of swirling vertical flow, we have made a comprehensive visualization experiment in a vertical pipe with 30mm diameter and 5m length by high-speed camera. The experimental pipe is separated into swirling part and non-swirling part. We have set three observation section with different vertical heights in the swirling part. Changing the flow rate of water and gas, different swirling flow pattern photos can be captured by high-speed camera. Based on the photos of different positions and image-processing MATLAB code, we can get three flow regime maps and figure out the decaying law of swirling gas-liquid flow. The pressure drop can be recorded by rotameter at each position. The decaying law of pressrure drop can be concluded from it. These data can be a guide for designing gas-liquid separator in SG to improve the efficiency of nuclear plant.

Various aspects of application of high-speed LIF-technique to studying the wavy structure of liquid film in annular gas-liquid flow

2012 ◽  
Author(s):  
Sergey Alekseenko ◽  
Andrey Cherdantsev ◽  
Sergey Kharlamov ◽  
Dmitry Markovich ◽  
Andrey Rabusov ◽  
...  
Keyword(s):  
Liquid Film ◽  
Liquid Flow ◽  
High Speed ◽  
Wavy Structure ◽  
Gas Liquid Flow ◽  
Structure Of Liquid

Experimental Investigation Of Detailed Structure Of Gas-Liquid Flow In Rectangular Microchannel

2016 ◽  
Vol 11 (1) ◽  
pp. 73-79
Author(s):  
German Bartkus ◽  
German Bartkus ◽  
Vladimir Kuznetsov ◽  
Vladimir Kuznetsov
Keyword(s):  
Liquid Flow ◽  
High Speed ◽  
Rectangular Cross Section ◽  
Rectangular Channel ◽  
Detailed Structure ◽  
Rectangular Microchannel ◽  
Flow Rates ◽  
Wide Range ◽  
Gas Liquid Flow ◽  
Vertical Microchannel

The detailed structure of upward gas-liquid flow of water and nitrogen in a vertical microchannel with a rectangular cross-section 420 × 280 µm was experimentally investigated. The experiments were conducted using the methods of high-speed video and laser-induced fluorescence. In a wide range of flow rates the characteristic regimes of the gas-liquid flow were defined, velocity of elongated bubbles and the local thickness of the liquid film were measured. The dependence of the local film thickness on the capillary number was determined and it was found that the Taylor Law for rectangular channel is not fully implemented due to the deformation of the interface and the contraction of the liquid into the corners of the channel by capillary force.

Experimental Study Structure Of Gas-Liquid Flow In Rectangular Minichannel By Optical Methods

2015 ◽  
Vol 10 (3) ◽  
pp. 63-69
Author(s):  
Igor Kozulin ◽  
Vladimir Kuznetsov
Keyword(s):  
Liquid Flow ◽  
High Speed ◽  
Laser Scanning ◽  
Rectangular Channel ◽  
Optical Methods ◽  
Statistical Characteristics ◽  
Transition Flow ◽  
Two Phase ◽  
Beam Laser ◽  
Gas Liquid Flow

In this paper, using method of two-beam laser scanning and high-speed video was identified patterns of distribution phases in the cross-section of the rectangular channel 0.72 × 1.50 mm with hydraulic diameter of the order to capillary constant. The structure of the gas-liquid flow was studied including flow regimes and statistical characteristics of the two-phase flow in regime with elongated bubbles, transition flow and annular flow regime.

scholarly journals Drift-flux model for gas-liquid flow subjected to centrifugal fields

2021 ◽  
Author(s):  
Marcos Penteado ◽  
Saon Vieira ◽  
Marcelo Castro ◽  
Antonio Bannwart
Keyword(s):  
Liquid Flow ◽  
High Speed ◽  
Bubble Diameter ◽  
Liquid Mixtures ◽  
Centrifugal Pumps ◽  
Drift Flux Model ◽  
Drift Flux ◽  
Artificial Lift ◽  
Flux Model ◽  
Gas Liquid Flow

Centrifugal pumps are used in several industrial processes. It is common the operation of this equipment with gas-liquid mixtures, which is the case of the electrical submersible pumping artificial lift method used in the oil industry. The increase of free gas fraction inside the pump may lead to unstable operation and problems such as surging and gas locking phenomena to occur. In this study a drift-flux model is proposed for the gas-liquid flow subjected to centrifugal fields using the impeller as an example. The model is closed with experimental data of bubble diameter, displacements and velocities acquired via high-speed camera at several different rotational speeds and gas mass flow rates using water as the continuous medium. From the modeling and the forces balance in the bubbles, a quantitative criterion for the start point of surging and gas locking conditions was proposed.

Investigation of Waves Interaction in Annular Gas–Liquid Flow Using High-Speed Fluorescent Visualization Technique

2008 ◽  
Vol 20 (3-4) ◽  
pp. 271-275 ◽  
Author(s):  
S. V. Alekseenko ◽  
V. A. Antipin ◽  
A. V. Cherdantsev ◽  
S. M. Kharlamov ◽  
D. M. Markovich
Keyword(s):  
Liquid Flow ◽  
High Speed ◽  
Visualization Technique ◽  
Waves Interaction ◽  
Gas Liquid Flow

Gas-Liquid Flow Through Horizontal Eccentric Annuli: CFD and Experiments Compared

2011 ◽  
Author(s):  
Mehmet Sorgun ◽  
Reza E. Osgouei ◽  
M. Evren Ozbayoglu ◽  
A. Murat Ozbayoglu
Keyword(s):  
Liquid Flow ◽  
High Speed ◽  
Two Phase Flow ◽  
Flow Behavior ◽  
Flow Patterns ◽  
Phase Flow ◽  
Cfd Model ◽  
Flow Loop ◽  
Two Phase ◽  
Gas Liquid Flow

Although flow of two-phase fluids is studied in detailed for pipes, there exists a lack of information about aerated fluid flow behavior inside a wellbore. This study aims to simulate gas-liquid flow inside horizontal eccentric annulus using an Eulerian-Eulerian computational fluid dynamics (CFD) model for two-phase flow patterns i.e., dispersed bubble, dispersed annular, plug, slug, churn, wavy annular. To perform experiments using air-water mixtures for various in-situ air and water flow rates, a flow loop was constructed. A digital high speed camera is used for recording each test dynamically for identification of the liquid holdup and flow patterns. Results showed that CFD model predicts frictional pressure losses with an error less than 20% for all two-phase flow patterns when compared with experimental data.

Application of a high-speed laser-induced fluorescence technique for studying the three-dimensional structure of annular gas–liquid flow

2011 ◽  
Vol 53 (1) ◽  
pp. 77-89 ◽  
Author(s):  
Sergey Alekseenko ◽  
Andrey Cherdantsev ◽  
Mikhail Cherdantsev ◽  
Sergey Isaenkov ◽  
Sergey Kharlamov ◽  
...  
Keyword(s):  
Liquid Flow ◽  
High Speed ◽  
Three Dimensional ◽  
Laser Induced Fluorescence ◽  
Dimensional Structure ◽  
Fluorescence Technique ◽  
Three Dimensional Structure ◽  
Gas Liquid Flow
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