Moisture farming is not just for the deserts of Tatooine -- advances in fog harvesting technology may provide an additional fresh water source in foggy coastal areas with little precipitation
Fog harvesting is a potential practical source of fresh water in foggy coastal deserts, and current solutions rely on meter scale nets/meshes. The mesh geometry, however, presents a physiologically inappropriate shape for millimeter scale bulk bodies, like insects.
(a) Simulation of flow past a cylinder with inertial particles by Chan, tracking the impact of particles on the surface of the collector. (b) In simulations, tracking a single droplet trajectory elicit that particle collides (red) when lubrication interaction is neglected, and skids along the surface when lubrication effect is present (blue). (c) Similar dynamics with lubrication is observed in experiments conducted by Shahrokhian, where particle barely touches and escapes from being deposited on the collector. (d) Three-dimensional simulation inertial particles flowing past a sphere with small bumps, mimicking surface features of Namib beetles.
Credit: Fan Kiat Chan and Aida Shahrokhian
Fan Kiat Chan, from the University of Illinois at Urbana-Champaign, offers biomimetic fog-gathering technologies based on Namib desert beetles as a potential solution. Chan will discuss how surface morphology can affect surrounding flow for droplet yield during a session at the American Physical Society's Division of Fluid Dynamics 72nd Annual Meeting, which will take place on Nov. 23-26, 2019, at the Washington State Convention Center in Seattle.
"The idea of using fog as a source of fresh water has been studied since the 1980s in various locations," Chan said. These studies have led to fog collection using nets and meshes, which are now commonly used in places like Chile and Morocco, among many others. The design was drawn from fog interception methods used by trees and can typically collect about 53 gallons of water on an average day.
However, Namib desert beetles use a different harvesting mechanism than trees do. These insects use the irregular surface morphology -- uneven bumps and flat areas -- on their backs to gather fresh water from desert fog. Inspired by the Namib beetle, Chan and collaborators Aida Shahrokhian and Hunter King, from Mechanical Biomimetics and Open Design Lab at the University of Akron, study how surface morphology affects the surrounding fluid flow, consequently leading to droplet impaction for harvesting.
"Similar principles could perhaps be used to design water bottles that are capable of collecting fog, enabling a more portable source," said Chan.
Chan will discuss the observed increase in collector's efficiency when surface textures, such as bumps like those of Namib desert beetles, are introduced. Combined with mesh-based designs, these collectors can provide an additional opportunity for freshwater harvesting in areas with limited precipitation.
"The water content and frequency of fog formation may vary depending on the location and the season," he said. "While precipitation may be infrequent in some regions, it is, however, important to realize that fog is nonetheless a predictable and, hence, reliable water source."
The talk, "Surface morphology and flow dynamics for fog harvesting," will be presented at 7:45 a.m. Pacific (U.S.) on Tuesday, Nov. 26 as part of the session on general fluid dynamics.
MORE MEETING INFORMATION
Main meeting website: https:/
Meeting technical program: http://meetings.
Invited talks: http://meetings.
Hotel information: https:/
GALLERY OF FLUID DYNAMICS
At the Annual Meeting, The Gallery of Fluid Motion will consist of posters and videos submitted by attendees illustrating the science and beauty of fluid motion. More information can be found here: https:/
We will grant free registration to credentialed journalists and professional freelance journalists. If you are a reporter and would like to attend, contact email@example.com. We can also help with setting up interviews and obtaining images, sound clips or background information.
LIVE MEDIA WEBCAST
A press briefing featuring a selection of newsworthy research will be webcast live from the conference on Monday, Nov. 25. Times and topics to be announced. Members of the media should register in advance at https:/
The Division of Fluid Dynamics of the American Physical Society, established in 1947, exists for the advancement and diffusion of knowledge of the physics of fluids with special emphasis on the dynamical theories of the liquid, plastic and gaseous states of matter under all conditions of temperature and pressure. For more information about DFD, visit https:/
The American Physical Society (APS) is a nonprofit membership organization working to advance and diffuse the knowledge of physics through its outstanding research journals, scientific meetings, and education, outreach, advocacy, and international activities. APS represents over 55,000 members, including physicists in academia, national laboratories, and industry in the United States and throughout the world.
New technique to determine protein structures may solve biomedical puzzles
12.12.2019 | Dana-Farber Cancer Institute
NTU Singapore scientists convert plastics into useful chemicals using su
12.12.2019 | Nanyang Technological University
More than one hundred and fifty years have passed since the publication of James Clerk Maxwell's "A Dynamical Theory of the Electromagnetic Field" (1865). What would our lives be without this publication?
It is difficult to imagine, as this treatise revolutionized our fundamental understanding of electric fields, magnetic fields, and light. The twenty original...
In a joint experimental and theoretical work performed at the Heidelberg Max Planck Institute for Nuclear Physics, an international team of physicists detected for the first time an orbital crossing in the highly charged ion Pr⁹⁺. Optical spectra were recorded employing an electron beam ion trap and analysed with the aid of atomic structure calculations. A proposed nHz-wide transition has been identified and its energy was determined with high precision. Theory predicts a very high sensitivity to new physics and extremely low susceptibility to external perturbations for this “clock line” making it a unique candidate for proposed precision studies.
Laser spectroscopy of neutral atoms and singly charged ions has reached astonishing precision by merit of a chain of technological advances during the past...
The ability to investigate the dynamics of single particle at the nano-scale and femtosecond level remained an unfathomed dream for years. It was not until the dawn of the 21st century that nanotechnology and femtoscience gradually merged together and the first ultrafast microscopy of individual quantum dots (QDs) and molecules was accomplished.
Ultrafast microscopy studies entirely rely on detecting nanoparticles or single molecules with luminescence techniques, which require efficient emitters to...
Graphene, a two-dimensional structure made of carbon, is a material with excellent mechanical, electronic and optical properties. However, it did not seem suitable for magnetic applications. Together with international partners, Empa researchers have now succeeded in synthesizing a unique nanographene predicted in the 1970s, which conclusively demonstrates that carbon in very specific forms has magnetic properties that could permit future spintronic applications. The results have just been published in the renowned journal Nature Nanotechnology.
Depending on the shape and orientation of their edges, graphene nanostructures (also known as nanographenes) can have very different properties – for example,...
Using a clever technique that causes unruly crystals of iron selenide to snap into alignment, Rice University physicists have drawn a detailed map that reveals...
03.12.2019 | Event News
15.11.2019 | Event News
15.11.2019 | Event News
12.12.2019 | Physics and Astronomy
12.12.2019 | Physics and Astronomy
12.12.2019 | Life Sciences