Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Innovative sensor technology for industrial applications

08.10.2007
In many industrial application areas so-called multiphase flows determine efficiency and safety issues of processes and plants. Everyone might know such flows from carbonated soft drinks, where after opening a bottle carbon dioxide bubbles rise in the liquid.

In the industry multiphase flows occur, for instance, in chemical reactors, power plants and turbo machinery. At the Forschungszentrum Dresden-Rossendorf a new sensor was recently developed which enables for the first time measurement and visualization of complex flows of arbitrary substance mixtures with high spatial and temporal resolution.

The analysis and modeling of industrial processes with methods of the experimental and theoretical thermal fluid dynamics is one of the tasks of the Institute of Safety Research at the Forschungszentrum Dresden-Rossendorf (FZD). Within the context of this work the new capacitance wire-mesh sensor was developed. This new sensor is a successor of the well known conductivity wire-mesh sensor, which was also developed at FZD and is currently being employed around the world. The conductivity wire mesh-sensor is based on the measurement of electrical conductivity in a flow cross-section and therefore only suited for the investigation of flow mixtures with an electrically conductive component, for example water-steam flows. The new capacitance wire-mesh sensor is now able to measure arbitrary substances, such as oil or other organic fluids. In this way, this sensor is applicable in a number of new fields, for example in process engineering and oil industry.

As the conductivity wire-mesh sensor the capacitance wire-mesh sensor consists of a set of wire electrodes stretched across a vessel or pipe in two slightly separated planes. Within one plane electrodes run in parallel whereas electrodes of different planes are perpendicular to each other. Thus, a grid of electrodes is formed in the cross-section (see figure). An associated electronics measures the electrical capacitance in all crossing points, which in turn is a measure of the dielectric constant of the substance surrounding each crossing point (the dielectric constant represents the extent to which a material concentrates the electrical field). The electronics is optimized to measure the tiny electrical capacitances of the crossing points which are in the range of only few Femtofarad (10-15 F).This can be done at very high time resolution of up to 10000 frames per second. Since different substances have different dielectric constant values, the sensor can discriminate phases or components. As an example the figure below shows a slug flow of air with a dielectric constant of 1 and silicone oil with a value of 2.7 in a pipe. Although the dielectric constants values of the two substances are rather close to each other, they are precisely distinguished by the capacitance wire-mesh sensor.

The capacitance wire-mesh sensor from the Forschungszentrum Dresden-Rossendorf may be employed in industrial applications where complex flow conditions are to be investigated. It does not require optical access to the flow as other measurement techniques do. The results of this work were recently published in the journal “Measurement Science and Technology”.

Christine Bohnet | alfa
Further information:
http://www.fzd.de
http://www.fz-rossendorf.de

More articles from Power and Electrical Engineering:

nachricht Multiregional brain on a chip
16.01.2017 | Harvard John A. Paulson School of Engineering and Applied Sciences

nachricht Researchers develop environmentally friendly soy air filter
16.01.2017 | Washington State University

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

Im Focus: Bacterial Pac Man molecule snaps at sugar

Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.

The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...

Im Focus: Newly proposed reference datasets improve weather satellite data quality

UMD, NOAA collaboration demonstrates suitability of in-orbit datasets for weather satellite calibration

"Traffic and weather, together on the hour!" blasts your local radio station, while your smartphone knows the weather halfway across the world. A network of...

Im Focus: Repairing defects in fiber-reinforced plastics more efficiently

Fiber-reinforced plastics (FRP) are frequently used in the aeronautic and automobile industry. However, the repair of workpieces made of these composite materials is often less profitable than exchanging the part. In order to increase the lifetime of FRP parts and to make them more eco-efficient, the Laser Zentrum Hannover e.V. (LZH) and the Apodius GmbH want to combine a new measuring device for fiber layer orientation with an innovative laser-based repair process.

Defects in FRP pieces may be production or operation-related. Whether or not repair is cost-effective depends on the geometry of the defective area, the tools...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

Multiregional brain on a chip

16.01.2017 | Power and Electrical Engineering

New technology enables 5-D imaging in live animals, humans

16.01.2017 | Information Technology

Researchers develop environmentally friendly soy air filter

16.01.2017 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>