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Related Concept Videos

Centrifugation01:05

Centrifugation

Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
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Steady, Laminar Flow Between Parallel Plates

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 22, 2026

Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow
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Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow

Published on: February 4, 2011

Segregation pattern competition in a thin rotating drum.

I Zuriguel1, J Peixinho, T Mullin

  • 1Departamento de Física y Matemática Aplicada, Universidad de Navarra, Pamplona 31008, Spain. iker@fisica.unav.es

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 13, 2009
PubMed
Summary
This summary is machine-generated.

In rotating granular mixtures, distinct particle size patterns emerge. Small particle streaks merge through a material flow opposite to the drum

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Last Updated: Jun 22, 2026

Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow
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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Area of Science:

  • Granular physics
  • Complex systems dynamics
  • Materials science

Background:

  • Granular mixtures exhibit complex behaviors when subjected to external forces.
  • Size segregation in granular materials is a key phenomenon in various industrial and natural processes.

Purpose of the Study:

  • To experimentally investigate the formation and dynamics of patterned size segregation in binary granular mixtures.
  • To analyze the mechanism of streak merging in a thin rotating drum.

Main Methods:

  • Experimental setup using a half-full thin rotating drum with binary granular mixtures.
  • Observation and analysis of particle segregation patterns using angular spatiotemporal diagrams.
  • Investigation of streak merging dynamics at varying rotation rates.

Main Results:

  • Formation of distinct particle size segregation patterns, including streaks of small particles within large ones.
  • Observation of a fixed integer number of streaks over specific rotation rate ranges.
  • Identification of a material flow opposite to drum rotation as the mechanism for streak merging.
  • Analysis of the dynamics of state exchange and streak disappearance.

Conclusions:

  • The study reveals a novel mechanism for patterned size segregation in granular mixtures.
  • The merging of small particle streaks is mediated by a counter-rotational flow of excess material.
  • Understanding these dynamics is crucial for controlling granular flows and mixtures.