What does coffee ring mean?

Definitions for coffee ring
cof·fee ring

This dictionary definitions page includes all the possible meanings, example usage and translations of the word coffee ring.

Princeton's WordNet

  1. coffee ringnoun

    ring-shaped coffeecake with fruits or nuts and often iced

Wikipedia

  1. coffee ring

    In physics, a "coffee ring" is a pattern left by a puddle of particle-laden liquid after it evaporates. The phenomenon is named for the characteristic ring-like deposit along the perimeter of a spill of coffee. It is also commonly seen after spilling red wine. The mechanism behind the formation of these and similar rings is known as the coffee ring effect or in some instances, the coffee stain effect, or simply ring stain.

ChatGPT

  1. coffee ring

    A coffee ring is a visible stain or mark typically left on a surface when a cup of coffee or other liquid is spilled and then dries, leaving behind the solid particles. It is most commonly found on table tops or papers. The phenomenon is also used in physics and material science to describe the distribution of particles in a drying colloidal droplet.

Wikidata

  1. Coffee ring

    In physics, a coffee ring is a pattern left by a puddle of particle-laden liquid after it evaporates. The phenomenon is named for the characteristic ring-like deposit along the perimeter of a spill of coffee. It is also commonly seen after spilling red wine. Writing in Nature, Robert D. Deegan of The University of Chicago and coworkers show that the pattern is due to capillary flow induced by the differential evaporation rates across the drop: liquid evaporating from the edge is replenished by liquid from the interior. The resulting edgeward flow can carry nearly all the dispersed material to the edge. Follow-up work by Hu and Larson suggests the evaporation induces a Marangoni flow inside a droplet. The flow, if strong, actually redistributes particles back to the center of the droplet. Thus, for particles to accumulate at the edges, the liquid must have a weak Marangoni flow, or something must occur to disrupt the flow. For example, surfactants can be added to reduce the liquid's surface tension gradient, disrupting the induced flow. Hu and Larson do mention that water has a weak Marangoni flow to begin with, which is then reduced significantly by natural surfactants. Later H.Burak Eral and colleagues in Physics of Complex Fluids group in University of Twente evoked alternating voltage electrowetting to suppress coffee stains noninvasively. This method shakes the contact line by alternatively increasing and decreasing contact angle effectively depinning the contact line as the droplet evaporates. Furthermore, with appropriate choice of excitation frequency internal flow fields can be generated counteracting the capillary flow increasing the efficiency of the suppression.

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Numerology

  1. Chaldean Numerology

    The numerical value of coffee ring in Chaldean Numerology is: 2

  2. Pythagorean Numerology

    The numerical value of coffee ring in Pythagorean Numerology is: 7


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"coffee ring." Definitions.net. STANDS4 LLC, 2024. Web. 24 Jul 2024. <https://www.definitions.net/definition/coffee+ring>.

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