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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Fluid Movement Between Compartments01:18

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The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
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Accelerating Fluids01:17

Accelerating Fluids

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When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
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Newtonian Fluid: Problem Solving01:18

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Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Laminar Flow: Problem Solving01:24

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Laminar flow occurs when a fluid moves smoothly in parallel layers with minimal mixing and turbulence. In fluid mechanics, ensuring laminar flow within a pipe is essential for precise control of flow characteristics, especially in engineering applications. The key factor in determining whether flow remains laminar is the Reynolds number, a dimensionless quantity that depends on the fluid's velocity, density, viscosity, and the pipe's diameter. A Reynolds number of 2100 or lower...
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Multiple objects interacting with a solidification front.

Sidhanth Tyagi1,2, Cécile Monteux2,3, Sylvain Deville4,5

  • 1Laboratoire de Synthèse et Fonctionnalisation des Céramiques, UMR 3080 CNRS/Saint-Gobain CREE, Saint-Gobain Research Provence, Cavaillon, France.

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Summary
This summary is machine-generated.

This study investigates how multiple oil droplets interact with an ice-water solidification front. Findings reveal object size, number, and solute concentration significantly impact interaction outcomes and material microstructure.

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Area of Science:

  • Materials Science
  • Physics
  • Chemical Engineering

Background:

  • The interaction between suspended objects and solidification fronts is crucial for material properties.
  • Previous models focused on simple systems (isolated, spherical objects in pure melts).
  • Complex systems with multiple objects and solutes remain poorly understood.

Purpose of the Study:

  • To investigate the interaction of multiple oil droplets with an ice-water front.
  • To understand the influence of object characteristics and solute concentration on this interaction.
  • To explore the resulting front morphology and object spatial distribution.

Main Methods:

  • In situ cryo-confocal microscopy was employed.
  • Experiments were conducted in both the absence and presence of solute effects.
  • The study analyzed the effects of object size, number, and bulk solute concentration.

Main Results:

  • Object size, number, and solute concentration were found to influence object-front interactions.
  • These factors also affected the solidification front morphology and the spatial distribution of objects.
  • The study observed how oil droplets are engulfed or repelled by the advancing ice front.

Conclusions:

  • The volume fraction of suspended objects and bulk solute concentration are key parameters for modeling object-front interactions.
  • These findings advance the understanding of solidification processes in complex, multi-component systems.
  • The research provides insights into controlling material microstructure and properties during solidification.