Featured Research

from universities, journals, and other organizations

Unlocking jams in fluid materials: A theoretical model to understand how to best avoid jamming of soft matter

Date:
October 6, 2011
Source:
Springer Science+Business Media
Summary:
In a new study, a German scientist constructed a theoretical model to understand how to best avoid jamming of soft matter that can be applied in food and cosmetics production.

In a study recently published in European Physical Journal E (EPJE), a German scientist constructed a theoretical model to understand how to best avoid jamming of soft matter that can be applied in food and cosmetics production.

Thomas Voigtmann, a researcher at the Institute for Material Physics in Space in Cologne, Germany, evaluated the internal friction force, or yield stress, to be overcome before a solid material made of a metallic melt with a glass structure can flow and thus prevent jamming.

These materials have an apparent viscosity that drops if they are forced to flow quickly -- a property called shear thinning. They are similar to solid paint that is highly viscous, almost solid, in a bucket and can easily become liquid when applied with a brush. The force applied to the paint by a brush stroke is sufficient for shear thinning to occur.

The properties of these metallic melts are not well understood. Until now, these materials have been studied using models for three classes of materials: soft matter (like toothpaste), metallic liquids, or granular materials (like sand).

However, none of these models accurately describes these materials.

Instead, Voigtmann devised two models that take into account the common properties between the three material classes; here the goal was to determine whether their yield stress is either continuous (it gets smaller with the flow rate) or discontinuous (remains at a constant value regardless of the flow rate) at a decreasing flow rate. He used available data to test the models; however, further data on lower flow rates than currently available would be required in order to be conclusive.

Further theoretical research will help us to understand how to process large amounts of soft matter for the food industry such as mayonnaise (an emulsion), jelly (a colloidal dispersion), or granular materials such as grains or pharmaceutical pills while avoiding blockages as they flow through processing pipes.


Story Source:

The above story is based on materials provided by Springer Science+Business Media. Note: Materials may be edited for content and length.


Journal Reference:

  1. Th. Voigtmann. Yield stresses and flow curves in metallic glass formers and granular systems. The European Physical Journal E, 2011; 34 (9) DOI: 10.1140/epje/i2011-11106-8

Cite This Page:

Springer Science+Business Media. "Unlocking jams in fluid materials: A theoretical model to understand how to best avoid jamming of soft matter." ScienceDaily. ScienceDaily, 6 October 2011. <www.sciencedaily.com/releases/2011/10/111005110407.htm>.
Springer Science+Business Media. (2011, October 6). Unlocking jams in fluid materials: A theoretical model to understand how to best avoid jamming of soft matter. ScienceDaily. Retrieved July 28, 2014 from www.sciencedaily.com/releases/2011/10/111005110407.htm
Springer Science+Business Media. "Unlocking jams in fluid materials: A theoretical model to understand how to best avoid jamming of soft matter." ScienceDaily. www.sciencedaily.com/releases/2011/10/111005110407.htm (accessed July 28, 2014).

Share This




More Matter & Energy News

Monday, July 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Lithium Battery 'Holy Grail' Could Provide 4 Times The Power

Lithium Battery 'Holy Grail' Could Provide 4 Times The Power

Newsy (July 28, 2014) Stanford University published its findings for a "pure" lithium ion battery that could have our everyday devices and electric cars running longer. Video provided by Newsy
Powered by NewsLook.com
The Carbon Trap: US Exports Global Warming

The Carbon Trap: US Exports Global Warming

AP (July 28, 2014) AP Investigation: As the Obama administration weans the country off dirty fuels, energy companies are ramping-up overseas coal exports at a heavy price. (July 28) Video provided by AP
Powered by NewsLook.com
Shipping Crates Get New 'lease' On Life

Shipping Crates Get New 'lease' On Life

Reuters - Business Video Online (July 25, 2014) Shipping containers have been piling up as America imports more than it exports. Some university students in Washington D.C. are set to get a first-hand lesson in recycling. Their housing is being built using refashioned shipping containers. Lily Jamali reports. Video provided by Reuters
Powered by NewsLook.com
Europe's Highest Train Turns 80 in French Pyrenees

Europe's Highest Train Turns 80 in French Pyrenees

AFP (July 25, 2014) Europe's highest train, the little train of Artouste in the French Pyrenees, celebrates its 80th birthday. Duration: 01:05 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins