Related Experiment Video
Updated: Apr 18, 2026
11:03
An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
9.1K
Low-frequency oscillations and convective phenomena in a density-inverted vibrofluidized granular system
C R K Windows-Yule1, N Rivas2, D J Parker1
1School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 24, 2015
Summary
Low-frequency oscillations (LFOs) are crucial for the transition between Leidenfrost and convective states in vibrated granular beds. Experiments confirm their consistent presence and agree with theoretical and simulation models.
Area of Science:
- Physics
- Granular Mechanics
- Fluid Dynamics
Background:
- Low-frequency oscillations (LFOs) are hypothesized to govern state transitions in vibrated granular systems.
- Understanding these transitions is key to controlling granular material behavior.
Purpose of the Study:
- To experimentally observe and characterize low-frequency oscillations (LFOs) in vibrated granular beds.
- To validate theoretical and simulation models against experimental findings for LFOs and associated phenomena.
Main Methods:
- Experimental setup involving vibrated granular beds with varying particle and container materials.
- Systematic variation of driving frequencies and amplitudes.
- Comparison of experimental data with theoretical predictions and numerical simulations.
Main Results:
- Low-frequency oscillations (LFOs) were consistently observed across diverse experimental conditions.
- Experimental results demonstrated strong qualitative and quantitative agreement with theory and simulations.
- Influence of sidewall dissipation on LFOs and density profiles was accurately reproduced in simulations.
Conclusions:
- Low-frequency oscillations (LFOs) are a fundamental characteristic of vibrated granular beds, influencing state transitions.
- The study validates the accuracy of current theoretical and simulation approaches for modeling these systems.
- Novel phenomena in the Leidenfrost state, including circulatory motion and inverse thermal convection, were observed and supported by simulations.
More Related Videos
Related Concept Videos
01:17Steady, 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
01:24Rapidly Varying Flow
720
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
720
01:06Forced Oscillations
8.4K
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
8.4K
01:11Pressure Variation in a Fluid at Rest
1.1K
In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
When measuring pressure at two different levels within the fluid, the difference in...
When measuring pressure at two different levels within the fluid, the difference in...
1.1K
01:29Gradually Varying Flow
671
Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
671
01:20Characteristics of Fluids
8.9K
When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
8.9K