AI Article Synopsis
- The friction coefficient of the Langevin equation and the drag on large spherical objects in low Reynolds number flows are often considered the same, but this study suggests they can differ.
- The research highlights that when considering mass, friction at the microscopic level doesn't always match macroscopic drag for particles similar in size to fluid molecules.
- Utilizing molecular dynamics simulations of chloride ions in water, the findings may inform advancements in drag reduction technologies and processes like electro or thermophoresis.
Article Abstract
Friction coefficient of the Langevin equation and drag of spherical macroscopic objects in steady flow at low Reynolds numbers are usually regarded as equivalent. We show that the microscopic friction can be different from the macroscopic drag when the mass is taken into account for particles with comparable scale to the surrounding fluid molecules. We illustrate it numerically by molecular dynamics simulation of chloride ion in water. Friction variation by the atomistic mass effect beyond the Langevin regime can be of use in the drag reduction technology as well as the electro or thermophoresis.
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| http://dx.doi.org/10.1063/1.4943045 | DOI Listing |
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