scholarly journals Application of the laser-induced fluorescence to study local characteristics of a gas-liquid flow in rectangular microchannel

2021 ◽  
Vol 2127 (1) ◽  
pp. 012008
Author(s):  
G V Bartkus ◽  
V V Kuznetsov
Keyword(s):  
Liquid Film ◽  
Liquid Flow ◽  
Phase Distribution ◽  
Laser Induced Fluorescence ◽  
Rectangular Microchannel ◽  
Rectangular Slit ◽  
Taylor’S Law ◽  
Elongated Bubble ◽  
Gas Liquid Flow ◽  
Working Liquid

Abstract The Laser-Induced Fluorescence (LIF) method was used to characterize liquid phase distribution in rectangular slit microchannel with cross-section 200×1205 μm for horizontal gas-liquid flow. Ethanol and nitrogen were used as working liquid and gas accordingly. The feature of this study is an application of hydraulic focusing cross-junction mixer for obtaining elongated bubble and transition flows in the microchannel with a high aspect ratio. Using LIF measurements for elongated bubble and transition flows the liquid film distributions were obtained for different distances from the bubble top and average liquid film thickness was compared with the prediction according to Taylor’s law.

Liquid film characterization in horizontal, annular, two-phase, gas–liquid flow using time-resolved laser-induced fluorescence

2011 ◽  
Vol 52 (3) ◽  
pp. 633-645 ◽  
Author(s):  
P. S. C. Farias ◽  
F. J. W. A. Martins ◽  
L. E. B. Sampaio ◽  
R. Serfaty ◽  
L. F. A. Azevedo
Keyword(s):  
Liquid Film ◽  
Liquid Flow ◽  
Laser Induced Fluorescence ◽  
Two Phase ◽  
Time Resolved ◽  
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

Microwave method for measurement of liquid film thickness in gas– liquid flow

1986 ◽  
Vol 57 (5) ◽  
pp. 952-956 ◽  
Author(s):  
R. P. Roy ◽  
J. Ku ◽  
I. Kaufman ◽  
J. Shukla
Keyword(s):  
Film Thickness ◽  
Liquid Film ◽  
Liquid Flow ◽  
Liquid Film Thickness ◽  
Microwave Method ◽  
Gas Liquid Flow

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.

Analysis of spatial and temporal spectra of liquid film surface in annular gas–liquid flow

2013 ◽  
Vol 54 (9) ◽  
Author(s):  
Sergey Alekseenko ◽  
Andrey Cherdantsev ◽  
Oksana Heinz ◽  
Sergey Kharlamov ◽  
Dmitriy Markovich
Keyword(s):  
Liquid Film ◽  
Liquid Flow ◽  
Film Surface ◽  
Gas Liquid Flow
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