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Related Concept Videos

Viscosity01:17

Viscosity

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When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
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Irrotational Flow01:28

Irrotational Flow

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Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:
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Viscosity of Fluid01:19

Viscosity of Fluid

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Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
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Laminar and Turbulent Flow01:07

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Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Updated: Jun 3, 2025

Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine
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Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine

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Linear-viscous flow of temperate ice.

Collin M Schohn1, Neal R Iverson1, Lucas K Zoet2

  • 1Department of Geological and Atmospheric Sciences, Iowa State University, Ames, IA, USA.

Science (New York, N.Y.)
|January 9, 2025
PubMed
Summary
This summary is machine-generated.

Temperate glacier ice behaves as a linear-viscous material, not nonlinear as previously assumed. This finding, based on shear-deformation experiments, impacts sea-level rise predictions.

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Area of Science:

  • Glaciology
  • Ice Physics
  • Climate Science

Background:

  • Accurate modeling of temperate glacier ice deformation is crucial for predicting sea-level rise.
  • Current models often rely on Glen's flow law, assuming nonlinear ice viscosity (n=3-4).
  • Temperate ice contains liquid water at grain boundaries, influencing its mechanical behavior.

Purpose of the Study:

  • To investigate the rheological behavior of temperate glacier ice under realistic stress and water content conditions.
  • To determine the strain rate exponent (n) for temperate ice deformation.
  • To assess the implications of observed ice viscosity for ice sheet modeling.

Main Methods:

  • Conducted large-scale, shear-deformation experiments on temperate glacier ice.
  • Varied liquid water content and applied stress within ranges relevant to glacier beds and ice-stream margins.
  • Analyzed the relationship between stress and strain rate to determine the viscosity exponent (n).

Main Results:

  • Temperate glacier ice exhibited linear-viscous behavior (n ≈ 1.0) across tested conditions.
  • This contrasts sharply with the nonlinear viscosity (n=3-4) assumed in Glen's flow law.
  • Observed linearity was attributed to diffusive pressure melting and refreezing at grain boundaries.

Conclusions:

  • The linear-viscous nature of temperate ice challenges existing ice flow models.
  • This finding may help stabilize predictions of ice sheet response to climate change.
  • Revised models incorporating linear viscosity could improve sea-level rise projections.