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関連する概念動画

Viscosity01:17

Viscosity

5.8K
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...
5.8K
Irrotational Flow01:28

Irrotational Flow

404
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:
404
Viscosity of Fluid01:19

Viscosity of Fluid

331
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.
331
Laminar and Turbulent Flow01:07

Laminar and Turbulent Flow

8.4K
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...
8.4K
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

27.5K
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...
27.5K
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

130
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.
130

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関連する実験動画

Updated: Jun 3, 2025

Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine
08:16

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

Published on: March 13, 2017

13.8K

温帯氷の線形粘性流

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
まとめ

温帯氷河は,以前考えられていたように非線形ではなく,線形粘性物質として振る舞う. シェア変形実験に基づいたこの発見は 海面上昇予測に影響を与えます

科学分野:

  • 氷河学
  • 氷の物理
  • 気候科学

背景:

  • 温帯氷河の変形を正確にモデル化することは 海面上昇を予測するのに不可欠です
  • 現在のモデルは,非線形氷の粘度 (n=3-4) を仮定して,しばしばグレンの流動法則に依存しています.
  • 温かい氷は粒の境界に液体の水を含み,その機械的振る舞いに影響します.

研究 の 目的:

  • 温帯氷河のレオロギー的な振る舞いを,現実的なストレスと水分含有量条件下で調査する.
  • 温帯氷の変形のストレート率指数 (n) を決定する.
  • 氷の粘度が氷床のモデル化に及ぼす影響を評価する.

主な方法:

  • 温帯の氷河で 大規模な剪定変形実験を行いました
  • 氷床と氷河流の縁に 関連する範囲内の液体水分と 施されたストレス.
  • 粘度指数 (n) を決定するために,ストレスとストレスの割合の関係を分析した.

主要な成果:

  • 温帯氷河は,試験条件において線形粘着性 (n ≈ 1.0) を示した.
  • これは,グレンの流動法則で仮定された非線形粘度 (n=3-4) と大きく対照的である.
  • 観測された線形性は,粒子の境界で拡散圧力溶解と再凍結に起因する.

さらに関連する動画

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
11:51

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Published on: February 22, 2018

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A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
08:01

A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization

Published on: August 18, 2022

3.0K

関連する実験動画

Last Updated: Jun 3, 2025

Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine
08:16

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

Published on: March 13, 2017

13.8K
Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
11:51

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Published on: February 22, 2018

8.6K
A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
08:01

A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization

Published on: August 18, 2022

3.0K

結論:

  • 温帯氷の線形粘着性は 既存の氷の流れモデルに 異議を唱えます
  • この発見は 気候変化に対する氷床の反応の予測を 安定させるのに役立つかもしれません
  • 線形粘度を組み込む改訂されたモデルは,海面上昇予測を改善することができる.