scholarly journals Gas-Liquid flow characterization in bubble columns with various gas-liquid using electrical resistance tomography

2009 ◽  
Vol 147 ◽  
pp. 012032 ◽  
Author(s):  
Haibo Jin ◽  
Han Yuhuan ◽  
Yang Suohe
Keyword(s):  
Liquid Flow ◽  
Electrical Resistance ◽  
Bubble Columns ◽  
Electrical Resistance Tomography ◽  
Flow Characterization ◽  
Gas Liquid Flow

Investigation of Liquid Dispersion in the Packed-Bed by Electrical Resistance Tomography

2012 ◽  
Author(s):  
Takeshi Eda ◽  
Achyut Sapkota ◽  
Masahiro Takei
Keyword(s):  
Liquid Flow ◽  
Electrical Resistance ◽  
Packed Bed ◽  
Electrical Resistance Tomography ◽  
Entire Cross Section ◽  
Basic Model ◽  
Liquid Dispersion ◽  
Flow Phenomena ◽  
Radial Dispersion ◽  
Gas Liquid Flow

Revealing gas-liquid permeable flow phenomena in the porous media is helpful for the environmental impact assessment of geological disposal of radioactive waste and purification of radioactive contamination water. This paper aims to investigate the liquid phase dispersion inside co-current downward gas-liquid flow in the bed packed with spherical particle as basic model. Water and air are injected from the top center of column, and water is spreading to the entire cross-section flowing down along the column. Radial dispersion of water is captured by electrical resistance tomography on several axial positions. The results indicated that liquid flow rate have impact on radial dispersion of water.

SIMULATION OF ELECTRODE FOR DUAL-MODALITY ELECTRICAL RESISTANCE TOMOGRAPHY AND ULTRASONIC TRANSMISSION TOMOGRAPHY FOR IMAGING TWO-PHASE LIQUID AND GAS

2015 ◽  
Vol 77 (17) ◽  
Author(s):  
Fazlul Rahman Mohd Yunus ◽  
Ruzairi Abdul Rahim ◽  
Leow Pei Ling ◽  
Nor Muzakkir Nor Ayob ◽  
Yasmin Abdul Wahab ◽  
...  
Keyword(s):  
Liquid Flow ◽  
Electrical Resistance ◽  
Region Of Interest ◽  
Gas Bubble ◽  
3D Numerical Modeling ◽  
Electrical Resistance Tomography ◽  
Two Phase ◽  
Transmission Tomography ◽  
Dual Modality ◽  
Gas Liquid Flow

Accurate multiphase flow measurement of gas/liquid, liquid/solid and liquid/liquid flow is still challenging for researchers in process tomography. The reconstructed images are poor particularly in the center area because of ill-posed inverse problems and limited of measurements data. Dual-modality tomography has been introduced to overcome the problem by means each modality is sensitive to specific properties of materials to be imaged. This paper proposed combination of ultrasonic transmission tomography (UTT) and electrical resistance tomography (ERT) for imaging two phase gas/liquid. In the proposed combination, detection ability in the medium of interest improved because two different images in the same space can be obtained simultaneously. This paper presents 3D numerical modeling approach using COMSOL software for ERT excitation strategy and electrode pre-designed geometry. Electrical resistance tomography (ERT) can be implemented for gas/liquid flow if the liquid is conductive. The objectives of this work is to analyze the optimum electrode dimension and shape in order to improve the situation of: (1) gas bubble detection located in the centre of the medium, (2) potential distribution and current density in a conductive medium, the developed numerical model simulated the changes in resistivity of the conductive material, with variations of electrode sizes, with opposite current excitation implemented into the region of interest. Simulation results show that the electrode size of 12 mm (w) × 40 mm (h) is suitable, which gives a good detection of center gas bubble with diameter 10mm in 100-mm-diameter acrylic vessel. Finally the findings are verified with Image reconstruction using Linear Back Projection (LBP) which gives good indication of the 10mm gas bubble.

Gas-liquid flow characterization and mass transfer study in a microreactor for oligomerization catalyst testing

2021 ◽  
pp. 108476
Author(s):  
Mahmoud Kamaleddine ◽  
Dr Charles Bonnin ◽  
Dr Typhène Michel ◽  
Dr Léna Brunet-Errard ◽  
Dr Joëlle Aubin ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Liquid Flow ◽  
Flow Characterization ◽  
Gas Liquid Flow ◽  
Transfer Study

Multi-scale analysis of gas–liquid interaction and CFD simulation of gas–liquid flow in bubble columns

2011 ◽  
Vol 66 (14) ◽  
pp. 3212-3222 ◽  
Author(s):  
Ning Yang ◽  
Zongying Wu ◽  
Jianhua Chen ◽  
Yuhua Wang ◽  
Jinghai Li
Keyword(s):  
Liquid Flow ◽  
Cfd Simulation ◽  
Bubble Columns ◽  
Scale Analysis ◽  
Multi Scale ◽  
Gas Liquid Flow ◽  
Multi Scale Analysis

Investigation of Gas-Liquid Flow Using Electrical Resistance Tomography and Wavelet Analysis Techniques for Early Kick Detection

2021 ◽  
Author(s):  
Abinash Barooah ◽  
Muhammad Saad Khan ◽  
Mohammad Azizur Rahman ◽  
Abu Rashid Hasan ◽  
Kaushik Manikonda ◽  
...  
Keyword(s):  
Flow Rate ◽  
Liquid Flow ◽  
Electrical Resistance ◽  
Liquid Flow Rate ◽  
Volume Fraction ◽  
Gas Kick ◽  
Input Pressure ◽  
Gas Volume Fraction ◽  
Gas Liquid Flow ◽  
Gas Volume

Abstract Gas kick is a well control problem and is defined as the sudden influx of formation gas into the wellbore. This sudden influx, if not controlled, may lead to a blowout problem. An accidental spark during a blowout can lead to a catastrophic oil or gas fire. This makes early gas kick detection crucial to minimize the possibility of a blowout. The conventional kick detection methods such as the pit gain and flow rate method have very low sensitivity and are time-consuming. Therefore, it is required to identify an alternative kick detection method that could provide real-time readings with higher sensitivity. In this study, Electrical Resistance Tomography (ERT) and dynamic pressure techniques have been used to investigate the impact of various operating parameters on gas volume fraction and pressure fluctuation for early kick detection. The experiments were conducted on a horizontal flow loop of 6.16 m with an annular diameter ratio of 1.8 for Newtonian fluid (Water) with varying pipe inclination angle (0–10°) and annulus eccentricity (0–30%), liquid flow rate (165–265 kg/min), and air input pressure (1–2 bar). The results showed that ERT is a promising tool for the measurement of in-situ gas volume fraction. It was observed that the liquid flow rate, air input pressure and inclination has a much bigger impact on gas volume fraction whereas eccentricity does not have a significant influence. An increase in the liquid flow rate and eccentricity by 60% and 30% decreased the gas volume fraction by an average of 32.8% and 5.9% respectively, whereas an increase in the inclination by 8° increased the gas volume fraction by an average 42%. Moreover, it was observed that the wavelet analysis of the pressure fluctuations has good efficacy for real-time kick detection. Therefore, this study will help provide a better understanding of the gas-liquid flow and potentially provide an alternative method for early kick detection.

Investigation of Transition Boundary and Nature of Pulsating Flow in the Trickle Bed Reactors by Electrical Resistance Tomography

2013 ◽  
Author(s):  
Takeshi Eda ◽  
Achyut Sapkota ◽  
Jun Haruta ◽  
Masayuki Nishio ◽  
Masahiro Takei
Keyword(s):  
Liquid Flow ◽  
Electrical Resistance ◽  
Flow Condition ◽  
Pulsating Flow ◽  
Fixed Bed Reactor ◽  
Electrical Resistance Tomography ◽  
Liquid Distribution ◽  
Cross Sectional ◽  
Transition Boundary ◽  
Trickle Bed

A fixed bed reactor that operates in gas-liquid co-current down flow is called Trickle Bed Reactor (TBR). It is widely used in chemical engineering. And, recently used in purification of radioactive contamination from contaminated water generated in the Fukushima Daiichi nuclear power plant. There are several flow conditions that occur in the TBR due to gas and liquid flow rate. Since mass and heat transfer rate and particles wetting depend on flow condition, it is necessary to establish the visualization techniques to understand flow condition, transition boundary and properties of gas liquid flow in TBR. In this study, authors employed the lab-scale TBR, made of 100mm inner diameter acrylic column, packed with particles of two sizes (3, 5 mm) that are used in the actual reactor. Water and air were injected from the top of the column and cross-sectional liquid distribution was captured at the bottom of the column by electrical resistance tomography (ERT). ERT is a tomographic technique that provides the cross-sectional conductivity distribution at the rate of about 50 frames per second by injecting current and measuring voltages between the 16 electrodes that are attached around the column. By analyzing the spatial and temporal characteristics of the liquid distribution obtained by ERT, it was found that particle size has only little impact on induction of pulsating flow and larger particle causes distinct pulses. Smaller particle causes blurred tiny pulses due to higher flow resistance. Larger particle (5 mm) is advantageous for pulsating flow.

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