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Published Journal Articles

2020

Insights into the transition from plug to slug flow in a horizontal pipe: An experimental study

2020-11
Chemical Engineering Research and Design (Volume : 163)
A thorough understanding of the behaviour of the transition from plug to slug flow is imperative based on the fact that the transition can trigger an abrupt radial pressure variation. This can bring about major vibrations to the pipeline and also lead to big differences in pressure gradient and wall temperature. Unfortunately, the transition from plug to slug flow is poorly understood due to the scarce availability of experimental data. Furthermore, a considerable amount of research on the transition from plug to slug flow in the literature is based on an air–water system. In this work, the transition behaviour from plug to slug flow in a horizontal pipeline was experimentally investigated using electrical capacitance tomography (ECT). Working fluids are air–silicone oil. The work was carried out over a range of liquid and gas superficial velocities of 0.05–0.47 m/s and 0.05–4.7 m/s, respectively. Wave growth and wave characteristics mechanisms were observed to be responsible for the transition from plug to slug flow based on the obtained experimental results. Both liquid and gas superficial velocities have a major influence also on these mechanisms. The drift flux parameters for the transition from plug to slug flow was determined. A reasonably good agreement was observed from the comparison between present experimental data against hitherto published empirical models and correlations

Experimental Investigation of Two-Phase Flow Bubble Charac-teristics in Small Bubble Column using Electrical Capacitance Tomography

2020-09
REVISTA DE CHIMIE (Issue : 9) (Volume : 71)
The present study has been carried out to investigate the characterization of two-phase flow bubbles that occurred in a column of an internal diameter 50 mm, where the liquid phase is represented in Silicone oil. The effectiveness of the tomography technique regarding the flow patterns analysis is studied as well as, high-speed videos were captured and used in the study. The void fractions of the time series were obtained at different flow rates were considered, and the results were analyzed also by using Probability Density Functions (PDF), film thickness, velocity structure, and Power Spectrum Density (PSD). To obtain the structure velocity, two tomography capacitance sensors were utilized so as to do cross-correlation, besides, the obtained videos were considered also to show the different bubble characteristics. A comparison was assessed between the previously available works of literature with the present study to evaluate the results. It was observed from the obtained tomography images that the flow was in the slug flow region explained by the presence of large bullet-shaped bubbles and the bubble characteristics obtained were comparable to that observed in other viscous liquids. Electrical Capacitance Tomography (ECT) was quite effective in investigating the flow.

Preparation of Clay Catalyst from Natural Clay and its uses in Desulfurization of Crude Oil

2020-08
International Journal of Engineering and Science Invention (Issue : 8) (Volume : 9)
This study explores the utilization of red soil and Kaolin clay in abstracting sulfur from the crude oil extracted from Qadia and Tawke fields in the Kurdistan Region of Iraq

Identification of Oil-Gas Two Phase Flow in Vertical pipe using Advanced Measurement Techniques

2020-07
Engineering, Technology & Applied Science Research (Issue : 5) (Volume : 10)
The identification and characteristics of flow configurations in pipes are very important in oil industry due to its role in governing equipment design. In vertical riser many flow configurations could be observed such as bubbly, slug, churn, and annular flow. In this project, two tomographic techniques have been applied simultaneously to the flow in vertical riser; an Electrical Capacitance Tomography (ECT) system and Capacitance Wire Mesh Sensor (WMS) system. The pipe diameter employed was 50 mm, investigation of research is carried out between 0.06 - 3.0 m/s for superficial velocities for gas and from 0.06 m/s to 0.4 m/s for oil. Several techniques have been used for analysis output data of two tomography techniques such as Time Series of Cross-Sectional Averaged void fraction, Probability Density Functions (PDF), Image Reconstruction, and Liquid hold up Profile. The averaged void fractions were calculated from the output signal of the two measurements techniques and plotted as function of superficial velocity of gas; from the PDF of the averaged void fraction the flow patterns such as bubbly, slug and churn flows were identified. In addition, it was found that two tomographic techniques are reliable to identify the flow regimes in pipes

Pressure drop, void fraction and flow pattern of vertical air–silicone oil flows using differential pressure transducer and advanced instrumentation

2020-05
Medical Hypotheses (Volume : 144)
New data for pressure drop, void fraction and flow pattern in a vertical riser using air–silicone oil as the system fluid are reported in this work. A differential pressure cell (DP cell) was used to measure the pressure drop. Also, void fraction data were recorded simultaneously by an electrical capacitance tomography (ECT) and wire mesh sensor (WMS). The observed flow patterns are the spherical cap bubble, slug and churn flows. However, only the slug flow without the presence of churn flow is seen within the transition line as predicted by the map. The characteristic probability density function (PDF) derived from void fraction data was used to determine the flow patterns. A comparison between present experimental results and the air–water data reported in the literature was carried out and various levels of agreement were achieved. The PDFs obtained from the DP cell signals for spherical cap bubble and slug flows significantly differ from those derived from the ECT and WMS outputs. Current void fraction and pressure gradient results were compared with the values predicted by ten empirical correlations selected from the literature. Statistical tools such as Mean Square Error (MSE), Root Mean Square Error (RMSE) and Mean Absolute Percentage Error (MAPE) were applied in the comparison. The Greskovich and Cooper correlation gave the least MSE, RMSE and MAPE values of 0.0007908, 0.013 and 3.05%, respectively for slug flow

The rheological behavior of MWCNTs–ZnO/Water–Ethylene glycol hybrid non-Newtonian nanofluid by using of an experimental investigation

2020-05
Journal of Materials Research and Technology (Issue : 4) (Volume : 9)
New data for pressure drop, void fraction and flow pattern in a vertical riser using air–silicone oil as the system fluid are reported in this work. A differential pressure cell (DP cell) was used to measure the pressure drop. Also, void fraction data were recorded simultaneously by an electrical capacitance tomography (ECT) and wire mesh sensor (WMS). The observed flow patterns are the spherical cap bubble, slug and churn flows. However, only the slug flow without the presence of churn flow is seen within the transition line as predicted by the map. The characteristic probability density function (PDF) derived from void fraction data was used to determine the flow patterns. A comparison between present experimental results and the air–water data reported in the literature was carried out and various levels of agreement were achieved. The PDFs obtained from the DP cell signals for spherical cap bubble and slug flows significantly differ from those derived from the ECT and WMS outputs. Current void fraction and pressure gradient results were compared with the values predicted by ten In the current study, an experimental study was carried out on the rheological properties of hybrid non-Newtonian nanofluid (MWCNTs–ZnO/Water–Ethylene glycol (80:20 vol.%)) to develop a new model. The viscosities of nanofluid were evaluated in the temperature range of 25–50 °C with volume fractions of φ = 0.075%, 0.15%, 0.3%, 0.6%, 0.9%, and 1.2%. We find that the effect of changes is more obvious when the φ is increased. So the property of non-Newtonian nanofluid is more likely to appear. In addition to a temperature of 25 °C, the viscosity increase from a φ = 0% to 1.2% is higher than 90%, which is very significant. Also, in the maximum φ, at T = 50 °C, 40 °C and 30 °C, the viscosity reduction is 21%, 17%, and 8%, respectively, relative to the reference temperature (25 °C). The above results can be of great help to engineers in designing thermal systems to increase heat transfer and considering pumping power

Roll of stenosis severity, artery radius and blood fluid behavior on the flow velocity in the arteries: Application in biomedical engineering

2020-05
Medical Hypotheses (Volume : 144)
In the current study, an experimental study was carried out on the rheological properties of hybrid non-Newtonian nanofluid (MWCNTs–ZnO/Water–Ethylene glycol (80:20 vol.%)) to develop a new model. The viscosities of nanofluid were evaluated in the temperature range of 25–50 °C with volume fractions of φ = 0.075%, 0.15%, 0.3%, 0.6%, 0.9%, and 1.2%. We find that the effect of changes is more obvious when the φ is increased. So the property of non-Newtonian nanofluid is more likely to appear. In addition to a temperature of 25 °C, the viscosity increase from a φ = 0% to 1.2% is higher than 90%, which is very significant. Also, in the maximum φ, at T = 50 °C, 40 °C and 30 °C, the viscosity reduction is 21%, 17%, and 8%, respectively, relative to the reference temperature (25 °C). The above results can be of great help to engineers in designing thermal systems to increase heat transfer and considering pumping power

Removal Of Sulphur From Crude Oil In Zakho District North Iraq

2020-03
INTERNATIONAL JOURNAL OF SCIENTIFIC & TECHNOLOGY RESEARCH (Issue : 3) (Volume : 9)
n this study, the sulfur content of crude oil and exported product from Zakho oil fields of Tawke and Qadia, in Kurdistan region of Iraq was studied. The following devices were used; Stanhope-seta (salt in crude oil), centrifuge for Bs&w, Anton par for specific gravity and density, parch method for H2S by nitrogen. Three samples of oil exported abroad were examined and evaluated at a laboratory Institute of fluid dynamics in Germany, for sulfur content and gravity. Several experiments have been conducted to determine the values of sulfur content in oil and some other characteristics related to the above mentioned oils as well as comparing them to global oils and trying to find new and inexpensive ways to reduce and eliminate the sulphur from crude oil.
2019

Experimental Study of the Two-Phase Flow Patterns of Air-Water Mixture at Vertical Bend Inlet and Outlet

2019-10
Engineering, Technology & Applied Science Research (Issue : 5) (Volume : 9)
Air-water two-phase flow in pipes introduces a noticeable challenge due to the complexity of the fluids.

Surface and Deep Soil 222Rn Gas Exhalation Comparison: A Case Study in Tawke, Duhok, Northern Iraq

2019-10
Engineering, Technology & Applied Science Research (Issue : 5) (Volume : 9)
abstract
2018

Semi Cylindrical Non-Tactile Capacitive Sensor: Equipotential Contour and Electrical Field Analysis

2018-10
IEEE explore (Issue : 2) (Volume : 3)
done

Experimental study of viscous effects on flow pattern and bubble behavior in small diameter bubble column

2018-09
Physics of Fluids (Issue : 9) (Volume : 30)
done
2017

The control and maintenance of desired flow patterns in bends of different orientations

2017-12
Flow Measurement and Instrumentation (Volume : 53)
done

Identification of Oil-Gas Two Phase Flow in Vertical Pipes using Tomography Techniques

2017-03
International Journal of Arts & Sciences
done

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