{"63206":{"#nid":"63206","#data":{"type":"news","title":"Wet Mammals Shake Dry in Milliseconds","body":[{"value":"\u003Cp\u003EIf you\u2019ve ever bathed a dog, you know firsthand how quickly a drenched pup can shake water off.\u003C\/p\u003E\u003Cp\u003ENow researchers at the Georgia Institute of Technology have found that furry mammals can shake themselves 70 percent dry in just a fraction of a second.\u003C\/p\u003E\u003Cp\u003EDavid Hu, assistant professor of mechanical engineering and biology at Georgia Tech, and mechanical engineering graduate student Andrew Dickerson, who led the project, used high-speed videography and fur particle tracking to characterize the shakes of 33 different animals \u2013 16 species and five dog breeds \u2013 at Zoo Atlanta. The research was published in the \u003Cem\u003EJournal of Royal Society Interface\u003C\/em\u003E.\u003C\/p\u003E\u003Cp\u003EUnderstanding the physics of the wet dog shake could help engineers recreate the optimal oscillation frequency and use it to improve the efficiency of washing machines, dryers, painting devices, spin coaters and other machines.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u0022We hope the findings from our research will contribute to technology that can harness these efficient and quick capabilities of drying seen in nature,\u201d Dickerson said.\u003C\/p\u003E\u003Cp\u003EIt may even lead to improved functioning for robotics, such as the Mars Rover, which suffered reduced power from the accumulation of dust on its solar panels.\u003C\/p\u003E\u003Cp\u003E\u201cIn the future, self-cleaning and self-drying may arise as an important capability for cameras and other equipment subject to wet or dusty conditions,\u201d Hu said.\u003C\/p\u003E\u003Cp\u003EOver millions of years, animals have perfected the mechanism to dry quickly to avoid hypothermia. Wet fur, being a poor insulator, causes the animal to lose heat quickly and the evaporation of the entrapped water may zap an animal\u2019s energy reserves, making it a matter of life or death to remain dry in cold weather, Hu said.\u003C\/p\u003E\u003Cp\u003ESmall animals may trap substantial volumes of water in their fur for their size. For example, when emerging for a bath, a person carries one pound of water. A rat, however, carries five percent of its mass and an ant three times its mass.\u003C\/p\u003E\u003Cp\u003EGeorgia Tech researchers found that animals oscillate at frequencies sufficient to lose water droplets and that shaking frequency is a function of animal size.\u003C\/p\u003E\u003Cp\u003EThe larger the animal, the more slowly it shakes dry, Hu and Dickerson said. For example, a mouse moves its body back and forth 27 times per second, but a grizzly bear shakes four times per second. The tinier mammals can experience more than 20 g\u2019s of acceleration.\u003C\/p\u003E\u003Cp\u003EMammals with fur, unlike humans, tend to have loose skin that whips around as the animal changes direction, increasing the acceleration. This is crucial to shaking success, and subsequently, body heat regulation, Dickerson said.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u201cWhat would you do on a cold day if you were wet and could not towel off or change clothes? Every warm-blooded furry creature faces this dilemma often,\u201d Dickerson said. \u201cIt turns out that oscillatory shaking exhibited by mammals is a quite efficient way to dry.\u201d\u003C\/p\u003E\u003Cp\u003EIn addition to observing live animals, the engineers also built a robotic wet-dog-shake simulator to further study how drops were ejected.\u003C\/p\u003E\u003Cp\u003EHu and Dickerson will continue to look at how animals interact with water in the natural world. Specifically, the researchers want to investigate how animals such as beavers and otters have adapted to life in the water and how water droplets interact with hair.\u0026nbsp;\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EIf you\u2019ve ever bathed a dog, you know firsthand how quickly a drenched pup can shake water off.\u0026nbsp;Now researchers at the Georgia Institute of Technology have found that furry mammals can shake themselves 70 percent dry in just a fraction of a second.\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Georgia Tech researchers have found that furry mammals can shake themselves 70 percent dry in just a fraction of a second."}],"uid":"27462","created_gmt":"2010-12-16 14:11:35","changed_gmt":"2016-10-08 03:07:54","author":"Liz Klipp","boilerplate_text":"","field_publication":"","field_article_url":"","dateline":{"date":"2012-08-16T00:00:00-04:00","iso_date":"2012-08-16T00:00:00-04:00","tz":"America\/New_York"},"extras":[],"hg_media":{"63204":{"id":"63204","type":"image","title":"Wet dog shake","body":null,"created":"1449176668","gmt_created":"2015-12-03 21:04:28","changed":"1475894554","gmt_changed":"2016-10-08 02:42:34","alt":"Wet dog shake","file":{"fid":"191777","name":"dog_shake_cloud.jpg","image_path":"\/sites\/default\/files\/images\/dog_shake_cloud_0.jpg","image_full_path":"http:\/\/www.tlwarc.hg.gatech.edu\/\/sites\/default\/files\/images\/dog_shake_cloud_0.jpg","mime":"image\/jpeg","size":2744953,"path_740":"http:\/\/www.tlwarc.hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/dog_shake_cloud_0.jpg?itok=eFgK2hJK"}}},"media_ids":["63204"],"related_links":[{"url":"http:\/\/www-old.me.gatech.edu\/hu\/","title":"David Hu\u0027s lab website"},{"url":"http:\/\/dickerson.gatech.edu\/file\/Wet-Dog_Shake.html","title":"Andrew Dickerson\u0027s website"}],"groups":[{"id":"1183","name":"Home"}],"categories":[{"id":"135","name":"Research"}],"keywords":[],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003E\u003Cstrong\u003EGeorgia Tech Media Relations\u003C\/strong\u003E\u003Cbr \/\u003ELaura Diamond\u003Cbr \/\u003E\u003Ca href=\u0022mailto:laura.diamond@comm.gatech.edu\u0022\u003Elaura.diamond@comm.gatech.edu\u003C\/a\u003E\u003Cbr \/\u003E404-894-6016\u003Cbr \/\u003EJason Maderer\u003Cbr \/\u003E\u003Ca href=\u0022mailto:maderer@gatech.edu\u0022\u003Emaderer@gatech.edu\u003C\/a\u003E\u003Cbr \/\u003E404-660-2926\u003C\/p\u003E","format":"limited_html"}],"email":["klipp@gatech.edu"],"slides":[],"orientation":[],"userdata":""}}}