Classical fluids, as a physical system, are collections of particles (atoms or molecules) whose macroscopic behavior is accurately described by classical mechanics and continuum hypotheses, neglecting quantum and relativistic effects. They are modeled by fields such as velocity, pressure, and density that satisfy the Navier–Stokes or Euler equations, depending on viscosity. Classical fluids encompass both liquids and gases in regimes where mean free paths and de Broglie wavelengths are small compared with system scales, enabling thermodynamic and hydrodynamic descriptions, including transport phenomena (viscosity, thermal conductivity, diffusion) and flow regimes characterized by dimensionless numbers like Reynolds and Mach numbers.
When water gets inside nanopores with sizes below 10 nanometers, new physics emerge: new phases of ice were observed and ultrafast proton transport was measured. Confined water also plays a role in biology, where aquaporins ...
Nanophysics
Jul 25, 2024
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138
In a study published in Nature Communications, collaborating physicists from Singapore and the UK have reported an optical analog of the Kármán vortex street (KVS). This optical KVS pulse reveals fascinating parallels between ...
Optics & Photonics
Jun 13, 2024
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355
Blood, lymph fluid and other biological liquids can have surprising and sometimes troubling properties. Many of these biological solutions are non-Newtonian fluids, a type of liquid that is characterized by a non-linear relationship ...
Soft Matter
May 27, 2024
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220
A study now published in Nature Communications brings remarkable insights into the enigmatic behavior of supercritical fluids, a hybrid state of matter occupying a unique space between liquids and gases, and arising in domains ...
General Physics
May 22, 2024
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156
Researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have developed a programmable metafluid with tunable springiness, optical properties, viscosity and even the ability to transition ...
Optics & Photonics
Apr 3, 2024
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210
"Opposites charges attract; like charges repel" is a fundamental principle of basic physics. But a new study from Oxford University, published today in Nature Nanotechnology, has demonstrated that similarly charged particles ...
Nanophysics
Mar 1, 2024
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1763
Every fluid—from Earth's atmosphere to blood pumping through the human body—has viscosity, a quantifiable characteristic describing how the fluid will deform when it encounters some other matter. If the viscosity is higher, ...
Soft Matter
Jan 30, 2024
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197
Add a dash of creamer to your morning coffee, and clouds of white liquid will swirl around your cup. But give it a few seconds, and those swirls will disappear, leaving you with an ordinary mug of brown liquid.
Condensed Matter
Jan 24, 2024
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420
Confined mass transfer mainly focuses on the dynamic behavior of water, ion, gas and other media confined in nanochannels. Scientists recently show increasing interest in confined mass transfer due to its wide application ...
Nanomaterials
Aug 16, 2021
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109
