Studying turbulence in a fluid with background damping

Bajaj, P.N.; Ivlev, A. V.; Räth, Christoph; Schwabe, Mierk

doi:10.1103/physreve.107.064603

Phys. Rev. E

2023

DOI: 10.1103/physreve.107.064603

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Studying turbulence in a fluid with background damping

P.N. Bajaj

A. V. Ivlev

Christoph Räth

et al.

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Cited by 4 publications

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Shivalik Plasma Device-I, a glow discharge device to study the collective dynamics of dusty plasma

Sharma,

Prakash

et al. 2023

AIP Advances

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Using a uniquely configured glow discharge-based Shivalik Plasma Device-I, we demonstrate a variety of collective phenomena in dusty plasma away from the glow discharge region. The cylindrical glass device produces plasma using parallel disc-shaped electrodes with a smaller anode size than the cathode. The dust microparticles are initially sprinkled over the grounded cathode. These particles acquire a significant negative charge upon plasma formation, resulting in their levitation due to the balance between the Coulomb force and gravity. The new device supports the levitation of a big-sized (10 × 8 × 5 cm3) three-dimensional dust cloud over the glass surface. It contrasts the dusty plasma formations in-between electrodes reported earlier. As the discharge voltage varies from high to low, the dust cloud travels from over the glass surface to between the electrodes. A complex interplay of dust void over the cathode, a sharp density gradient, and gravity lead to self-excitation of collective dust phenomena. It includes dust density waves (phase velocity, vph ∼ 4 cm/s), dust cloud oscillation (frequency, f = 5 Hz), sheared flow (flow velocity, vf ∼ 1 cm/s), and multiple-sized dust vortices. These dust vortices provided an excellent platform for studying turbulent mixing phenomena. The power spectrum analysis agreed with two-dimensional Kolmogorov power-law scaling. This is an ideal dusty plasma apparatus where we can create or move the dust cloud to a location of choice from the glass surface to in-between the electrodes and excite one among many collective dust dynamics.

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Shivalik Plasma Device-I, a glow discharge device to study the collective dynamics of dusty plasma

Sharma,

Prakash

et al. 2023

AIP Advances

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Rayleigh–Taylor turbulence in strongly coupled dusty plasmas

Wani,

Verma,

Tiwari

2024

Physics of Plasmas

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The turbulence mixing initiated by the Rayleigh–Taylor instability has been reported in a two-dimensional (2D) strongly coupled dusty plasma system using classical molecular dynamics simulation. The entire evolution cycle, including the initial equilibrium, the instability, turbulent mixing, and, finally, a new equilibrium through the thermalization process, has been demonstrated via the respective energy spectra. The fully developed spectrum follows the Bolgiano-Obukho k−11/5 scaling at smaller wavenumbers, a characteristic 2D buoyancy-driven turbulent flow feature. At higher wavenumbers, the energy spectrum E(k)∝k represents the thermalization of the system and is a characteristic feature of 2D Euler turbulence. At longer timescales, the system reflects the Kolmogorov scale of k−3. Moreover, strong coupling slows the turbulent mixing process, though the final state is a complete thermalized system. Our results also help us to understand the thermalization process in Yukawa fluids, other strongly coupled plasma families, and turbulent mixing in low Reynolds number fluids.

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Observation of Kolmogorov turbulence due to multiscale vortices in dusty plasma experiments

Sharma,

Wani,

Srivastav

et al. 2024

Physics of Plasmas

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We report the experimental observation of fully developed Kolmogorov turbulence originating from self-excited vortex flows in a three-dimensional (3D) dust cloud. The characteristic −5/3 scaling of 3D Kolmogorov turbulence is consistent in both the spatial and temporal energy spectra within a statistical variation of experimental data. Additionally, the 2/3 scaling in the second-order structure function further supports the presence of Kolmogorov turbulence. We also identified a slight deviation in the tails of the probability distribution functions for velocity gradients, a reflection of intermittency. The experiment showed the formation of a dust cloud in the diffused plasma region away from the electrodes. The dust rotation was observed in multiple experimental campaigns under different discharge conditions at different spatial locations and background plasma environments.

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Studying turbulence in a fluid with background damping

Cited by 4 publications

References 50 publications

Shivalik Plasma Device-I, a glow discharge device to study the collective dynamics of dusty plasma

Shivalik Plasma Device-I, a glow discharge device to study the collective dynamics of dusty plasma

Rayleigh–Taylor turbulence in strongly coupled dusty plasmas

Observation of Kolmogorov turbulence due to multiscale vortices in dusty plasma experiments

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