Featured Research

from universities, journals, and other organizations

Try clapping your wet hands; A physics lesson

Date:
August 15, 2013
Source:
Virginia Tech (Virginia Polytechnic Institute and State University)
Summary:
Clap your wet hands. What happens to a thin film of water when it is compressed vertically? Ultimately, oil companies are interested in this research because of the oil separation process.

This image is of a liquid sheet squeezed from two clapping hands at the velocity of 10.2 centimeter per second.
Credit: Image courtesy of Virginia Tech

Sunny Jung continues to redefine the views on the laws of physics, and in doing so, impacts the research on topics as varied as drug delivery methods to fuel efficiency.

Related Articles


In a paper appearing this month in Physical Review E, Jung and five colleagues reported on the dynamics of squeezing fluids using a simple experiment of clapping with wet hands. As an engineer, Jung described "this outburst of fluid motion" as an unusual physical phenomena.

Earlier in his career, Jung, an assistant professor of engineering science and mechanics at Virginia Tech, made headlines in the New York Times for his study with peers from MIT and Princeton on how a cat exploits fluid inertia to defeat gravity and actually pulls liquid into the feline's mouth. The implications of this research can be used in understanding more about the technology of microfluidics, the behavior of fluids at the microscale level, including pharmaceutical drug deliveries into the fluids in the human body.

In a different study involving liquids, Jung showed how certain identical flows of fluids, normally thought to coalesce to form a single mass of fluid, would not if the speed of the flow was increased beyond a certain threshold. Understanding this reaction of fluid flows has implications for the mixing of fuel fluids in order to maximize combustion to attain fuel efficiency.

Jung's achievements in fluid flow won him the 2010 international Milton Van Dyke award from the American Physical Society. He had only received his doctorate in physics five years earlier from the University of Texas at Austin.

Now, Jung's most recent paper on fluid flow speaks to the reaction of thin films of liquid when compressed vertically between two objects. The film is ejected radially and generates fluid threads and droplets at a high speed.

A simple example of this physics phenomenon is part of the title of his paper: Dynamics of squeezing fluids: Clapping wet hands.

"Everyone has experienced water drops hitting one's face when wet hands are clapped," Jung said. The scientific question is why does a thin film of liquid, in this case, water on the hands, break into small drops by the squeezing or clapping motion.

"To transit from a film to drops, fluids need to undergo instability, and in this case, it is the up and down crown splash due to surface tension," Jung explained.

"Another example might be water splash when you step into a thin water puddle. This example is a little bit different from the current study in terms of plate geometry, but the underlying physics is shared," Jung added.

Other comparable fluids such as gasoline and oil behave similarly but a very viscous fluid such as honey would not.

Oil companies are interested in this research because of the oil separation process. In this process, "such interfacial dynamics of multiphase fluids serve as one of the fundamental mechanisms," Jung explained.

Jung received funding for this work from the American Chemistry Society -- Petroleum Research Fund and the National Science Foundation's Physics of Living System program area.

His co-authors are: Sean Gart of Salem, Va., Brian Chang of Burke, Va., and Randy Goodnight of Falls Church, Va., all students in engineering science and mechanics, and Brice Slama of Ecole Polytechnique of Palaiseau, Cedex, and Soong Ho Um of Sungkyunkwan University, Korea.

Jung's interdisciplinary research spans across the fields of applied mathematics, physics and biology. As a professor, he teaches fluid and senior design courses at the undergraduate level.


Story Source:

The above story is based on materials provided by Virginia Tech (Virginia Polytechnic Institute and State University). Note: Materials may be edited for content and length.


Journal Reference:

  1. Sean Gart, Brian Chang, Brice Slama, Randy Goodnight, Soong Ho Um, Sunghwan Jung. Dynamics of squeezing fluids: Clapping wet hands. Physical Review E, 2013; 88 (2) DOI: 10.1103/PhysRevE.88.023007

Cite This Page:

Virginia Tech (Virginia Polytechnic Institute and State University). "Try clapping your wet hands; A physics lesson." ScienceDaily. ScienceDaily, 15 August 2013. <www.sciencedaily.com/releases/2013/08/130815104801.htm>.
Virginia Tech (Virginia Polytechnic Institute and State University). (2013, August 15). Try clapping your wet hands; A physics lesson. ScienceDaily. Retrieved January 25, 2015 from www.sciencedaily.com/releases/2013/08/130815104801.htm
Virginia Tech (Virginia Polytechnic Institute and State University). "Try clapping your wet hands; A physics lesson." ScienceDaily. www.sciencedaily.com/releases/2013/08/130815104801.htm (accessed January 25, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Sunday, January 25, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Obama Reveals Nuclear Breakthrough on Landmark India Trip

Obama Reveals Nuclear Breakthrough on Landmark India Trip

Reuters - News Video Online (Jan. 25, 2015) In a glow of bonhomie, U.S. President Barack Obama and Indian Prime Minister Narendra Modi unveil a deal aimed at unlocking billions of dollars in nuclear trade. Pavithra George reports. Video provided by Reuters
Powered by NewsLook.com
NTSB: Missing Planes' Black Boxes Should Transmit Wirelessly

NTSB: Missing Planes' Black Boxes Should Transmit Wirelessly

Newsy (Jan. 23, 2015) In light of high-profile plane disappearances in the past year, the NTSB has called for changes to make finding missing aircraft easier. Video provided by Newsy
Powered by NewsLook.com
Iconic Metal Toy Meccano Goes Robotic

Iconic Metal Toy Meccano Goes Robotic

Reuters - Innovations Video Online (Jan. 22, 2015) Classic children&apos;s toy Meccano has gone digital, releasing a programmable kit robot that can be controlled by voice recognition. The toymakers say Meccanoid G15 KS is easy to use and is compatible with existing Meccano pieces. Jim Drury reports. Video provided by Reuters
Powered by NewsLook.com
The VueXL From VX1 Immersive Smartphone Headset!

The VueXL From VX1 Immersive Smartphone Headset!

Rumble (Jan. 22, 2015) The VueXL from VX1 is a product that you install your smartphone in and with the magic of magnification lenses, enlarges your smartphones screen so that it&apos;s like looking at a big screen TV. Check it out! Video provided by Rumble
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:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

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