Measurement of the void fraction and maximum dry angle using electrical capacitance tomography applied to a 7 mm tube with R-134a

2018 ◽  
Vol 95 ◽  
pp. 122-132 ◽  
Author(s):  
Abdeel Román ◽  
Joseph Cronin ◽  
Jamie Ervin ◽  
Larry Byrd
Keyword(s):  
Void Fraction ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
R 134A ◽  
Capacitance Tomography

Thermal Effect on Void Formation of Waxy Crude Oil Using Electrical Capacitance Tomography

2013 ◽  
Vol 63 (1) ◽  
Author(s):  
Areeba Shafquet ◽  
Idris Ismail ◽  
Azuraien Jaafar
Keyword(s):  
Crude Oil ◽  
Void Fraction ◽  
Crude Oils ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Waxy Crude Oil ◽  
Sustainable Operations ◽  
Waxy Crude ◽  
Waxy Crude Oils ◽  
Capacitance Tomography

Waxy crude oils are commonly found in many parts of the world and represent a huge amount of the global oil reserves. Precipitation of paraffin waxes during various phases creates many problems in the oil industry. Therefore, waxy crude oils create many flow assurance issues essentially linked to them and understanding of the effect of relevant factors and phenomena are of great practical importance. In process industries, the measurement of void fraction is considerably important for sustainable operations and the erroneous calculation could be the cause of many industrial accidents. The customary approach separates the two-phases first and then measures the mixture as individual components. These methods are not favorable as they may result in the disruption of incessant industrial processes. Due to these limitations, this study is aimed to analyze the gel formation behavior of a waxy crude oil under static and dynamic cooling using non-invasive/non-intrusive experimental technique; i.e. Electrical Capacitance Tomography (ECT). This paper describes a fabrication of dual-plane ECT sensor for testing of waxy crude oil at different temperature conditions. ECT images and raw data measurements have been obtained from the two planes are then normalised and then used for image reconstruction. The findings reported in this paper represent part of an ongoing investigation that may lead to develop a cross-correlation between the two planes. The outcome of the study could be used to fully understand the phenomenon of void fraction in waxy crude based on varying the temperature and also based on the design of ECT sensor.

Experimental Study on Transporting Concentration of Pulverized-Coal Using ECT

2013 ◽  
Vol 779-780 ◽  
pp. 1052-1055
Author(s):  
Jing Liu ◽  
Zheng Du ◽  
Shan Shan Chen ◽  
Meng Sun
Keyword(s):  
Void Fraction ◽  
Combustion Process ◽  
Experimental Studies ◽  
Pulverized Coal ◽  
Electrical Capacitance Tomography ◽  
Cyclone Separator ◽  
Pneumatic Conveying ◽  
Electrical Capacitance ◽  
Economic Operation ◽  
Capacitance Tomography

Accurate measurement of the concentration of pulverized-coal in various pipes as a guidance to proper control plays a key role in assuring safe and economic operation of a pulverized coal-fired boiler during the combustion process. Experimental studies are carried out on the measurement of a lean mass flow in a pneumatic conveying pipeline using electrical capacitance tomography (ECT). A cyclone separator is employed in this system where the sensors are placed in order to compensate the inhomogeneity of the sensor sensitivity. The distribution of void fraction in radial direction, the average void fraction and the wavy characteristics are analyzed. The feasibility and reliability of the method are verified by the experimental results.

Evaluation of Electrical Capacitance Tomography Thresholding Techniques for Void Fraction Measurement of Gas-Liquid System

2014 ◽  
Vol 625 ◽  
pp. 439-443 ◽  
Author(s):  
Irene Sow Mei Lock ◽  
Idris B. Ismail ◽  
Bawadi Abdullah ◽  
Areeba Shafquet
Keyword(s):  
Void Fraction ◽  
Preliminary Investigation ◽  
Dielectric Materials ◽  
Liquid System ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Threshold Method ◽  
Binary Phase ◽  
Fraction Measurement ◽  
Capacitance Tomography

An analysis on the void fraction measurement for binary phase gas-liquid dielectric materials inside an Electrical Capacitance Tomography (ECT) sensor has been performed on the tomogram images by using different thresholding techniques. The analysis is pertinent to improve the accuracy of the application of thresholding technique for void fraction measurements in pipelines and reactors since the currently available information is limited in terms of accuracy. This preliminary investigation was performed to evaluate the accuracy of three different thresholding algorithms: Otsu’s, Niblack’s and Kuo’s Method based on the void fraction measurement for a binary phase oil-air system. The experimental and image processing analysis enables one to determine the optimal threshold method by selecting the threshold algorithm which produces the highest accuracy and consistency in the void fraction measurement as compared to the actual value.

Sign in / Sign up

Export Citation Format

Share Document