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Related Concept Videos

Colloids03:22

Colloids

17.2K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
17.2K
Colloids and Suspensions01:17

Colloids and Suspensions

3.4K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
3.4K
Types of Fluids01:27

Types of Fluids

1.2K
Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...
1.2K
Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

1.1K
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.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
1.1K
Capillarity in Fluid01:19

Capillarity in Fluid

1.6K
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.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
1.6K
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

1.1K
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.
1.1K

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Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids
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Spreading of nanofluids on solids.

Darsh T Wasan1, Alex D Nikolov

  • 1Department of Chemical and Environmental Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, USA. wasan@iit.edu

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This summary is machine-generated.

Nanofluids exhibit unique spreading behaviors due to particle ordering at contact lines. This discovery reveals a novel mechanism for enhanced oil recovery and effective oily soil removal.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Environmental Engineering

Background:

  • Nanofluids, suspensions of nanoscale particles, have diverse applications, but their spreading and adhesion differ from simple liquids.
  • Existing theories suggest particle ordering in nanofluids influences their macroscopic behavior.
  • Understanding these phenomena is crucial for applications like soil remediation and oil recovery.

Purpose of the Study:

  • To investigate the spreading dynamics and particle ordering in nanofluids at the three-phase contact region.
  • To explore the potential of nanofluid behavior for practical applications such as oily soil removal.

Main Methods:

  • Utilized video microscopy to observe the behavior of charged nanometre-sized polystyrene spheres in water.
  • Analyzed the two-dimensional crystal-like ordering of particles at the fluid's edge.

Main Results:

  • Demonstrated two-dimensional crystal-like ordering of polystyrene spheres in water at the three-phase contact region.
  • Observed enhanced spreading dynamics in micellar fluids, correlating with particle ordering.
  • Identified a novel mechanism for detergency in oily soil removal.

Conclusions:

  • Colloidal ordering in nanofluids significantly enhances spreading dynamics.
  • This enhanced spreading provides a new mechanism for effective oily soil removal and improved oil recovery.
  • Findings challenge traditional liquid spreading models and offer new avenues for materials science and environmental applications.