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Related Concept Videos

Boundary Layer Characteristics01:18

Boundary Layer Characteristics

When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
Capillarity in Fluid01:19

Capillarity in Fluid

Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
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Viscosity

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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 concentration...
Steady, Laminar Flow Between Parallel Plates01:17

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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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Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions
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Effect of a fluid-wall interaction on a drying layer.

Alla Oleinikova1, Ivan Brovchenko

  • 1Physical Chemistry, University of Dortmund, Otto-Hahn-Str. 6, Dortmund, D-44227, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 13, 2007
PubMed
Summary

The drying layer thickness in confined liquids depends on pore size and fluid-wall interactions. Stronger interactions and smaller pores reduce drying layer thickness, showing distinct temperature behaviors.

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Area of Science:

  • Physics
  • Physical Chemistry
  • Materials Science

Background:

  • Understanding fluid behavior in confined geometries is crucial for materials science and nanotechnology.
  • The formation of drying layers at interfaces is a key phenomenon in phase transitions.
  • Previous studies have explored confinement effects, but the interplay of fluid-wall interactions and pore size on drying layers requires further investigation.

Purpose of the Study:

  • To investigate the density profiles of Lennard-Jones liquids confined in slit pores.
  • To analyze the temperature dependence of the drying layer thickness (L0) under varying fluid-wall interactions (weakly attractive or hard walls).
  • To examine the influence of pore width on the drying layer and interface sharpness.

Main Methods:

  • Simulations of Lennard-Jones liquid confined in slit pores.
  • Analysis of density profiles along the pore coexistence curve.
  • Calculation of drying layer thickness (L0) as a function of temperature (tau = 1-T/Tc) and fluid-wall interaction strength.

Main Results:

  • In large pores, drying layer thickness (L0) scales with bulk correlation length (xi-) near the critical temperature (Tc).
  • Strengthening fluid-wall interactions suppresses L0, leading to logarithmic growth with reduced temperature (tau).
  • Small pores significantly suppress the drying layer, with thickness showing logarithmic growth and saturation upon heating.

Conclusions:

  • The study reveals two distinct regimes for L0's temperature dependence, suggesting a partial drying transition for weak fluid-wall interactions.
  • Confinement effects, particularly in smaller pores, drastically alter drying layer formation and thickness.
  • The sharpness of the liquid-drying layer interface is sensitive to fluid-wall interactions and pore width.