Chaotic electro-convection flow states of a dielectric liquid between two parallel electrodes

Wang, Qi; Guan, Yifei; Huang, Junyu; Wu, Jian

doi:10.1016/j.euromechflu.2021.07.001

Cited by 14 publications

(12 citation statements)

References 47 publications

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“…Time series of Ne , Nu , and u max at Ra = 100,000 and T = 200. After the initial perturbation at t = 0, the ETHD system exhibits a transition from a quasi-periodic state, similar to the one previously seen in a 2D system, 48 to a chaotic state. (t1–4) are four representative time steps where flow fields are visualized; see Figure 4.…”

Section: Resultssupporting

confidence: 64%

“…ETHD convection occurs when the hydrostatic base state becomes an unstable equilibrium state with increasing T and Ra . In this work, we study the effects of Ra at T = 500, and the effects of T at Ra = 100,000, while these separate driving forces alone ( T = 500, Ra = 0 48,56 or T = 0, Ra = 100,000 57,58 ) are sufficient to maintain chaotic flows. As T = 0 is undefined for system equations (1)–(6), we define T = 0 as the case where the electric field (Coulomb force) is absent.…”

Section: Resultsmentioning

confidence: 99%

“…Short after the perturbation, for t = 2–10, the system exhibits temporally quasi-periodicity similar to the one observed in 2D EHD systems. 48 Then the system slowly develops into a statistical equilibrium, where the fluctuations become small, and the mean value remains unchanged via a transition region from t = 10 to 20. of Nu and u max decay with time when the system slowly develops into chaos.…”

Section: Resultsmentioning

confidence: 99%

“…47 More details on algorithm implementation can refer to our previous work. 38,39,41,48 Our numerical method is spatial second order accuracy. To reduce the numerical error, all variables are calculated with double precision.…”

Section: Numerical Methods and Boundary Conditionsmentioning

confidence: 99%

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Enhanced heat transfer and symmetry breaking in three-dimensional electro-thermo-hydrodynamic convection

Wang

Guan

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this work, the electro-thermo-hydrodynamic convection system induced by unipolar charge injection between two parallel electrodes is numerically investigated. A two-relaxation-time lattice Boltzmann method coupled with a fast Poisson solver is implemented to obtain the temporal and spatial distributions of the flow field, temperature field, electric field, and charge density of the system. Due to the electric force and destabilizing buoyancy force, the system exhibits electro-thermo-convective vortices and transitions to a chaotic flow field, where the flow fluctuates irregularly in time. The strong electric driving force is shown to double the heat transfer effects measured by the Nusselt number ( Nu). The size of the computational domain is found to influence the stability and flow analysis. Specifically, the system is chaotic in a large computational domain but the same set of parameters can lead to a steady-state condition in a small domain.

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Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Numerical Methods and Boundary Conditionsmentioning

confidence: 99%

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Enhanced heat transfer and symmetry breaking in three-dimensional electro-thermo-hydrodynamic convection

Wang

Guan

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…To better understand these EHD flows, significant progress has been made in theories related to the nature and origin of space charge [9,10], in experiments related to flow and current measurements [11,12], and in simulations associated with modelling [13], electroconvective instability [14] and verification of experiments [15][16][17]. The configuration of the actuator of the pump, the propriety of the dielectric liquid, and the applied signal can all play a significant role in determining injection strength, dissociation intensity, and flow structure.…”

Section: Introductionmentioning

confidence: 99%

Structural characteristics of electrohydrodynamic jets induced by a blade‐plane actuator subjected to highly non‐uniform electric fields: Parametric investigation through the particle image velocimetry techniques

et al. 2022

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This study set out to systematically investigate the structural characteristics of plane electrohydrodynamic jets through the particle image velocimetry (PIV) techniques. Due to the wide range of applied voltages and electrode gaps under various experimental conditions, an assessment of the image quality and a statistical analysis of the velocity fields are first performed to ensure the validity of the PIV measurements, which were originally applied purely to fluid mechanics. The results indicate that the time interval between two consecutive images should be pre‐adjusted to reduce the number of uncorrelated vector fields. Moreover, the minimum number of instantaneous fields should be achieved for an accurate calculation of the time‐averaged fields. An equivalent electric field criterion adapted to the asymmetric electrode configuration is defined to find similarities in flow structures under different voltage and electrode gap conditions. As the applied electric field increases, three injection regimes are identified and the current increases almost linearly, indicating a large conduction current component. The decrease in charge density due to recombination proves to be relevant in all cases of this study. Analogous to the parametric analysis approach for classical jets and thermal plumes, the evolution of the coefficients of axial velocity, half‐width and turbulence intensity are investigated.

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The Electroconvective Flows of a Weakly Conducting Liquid in the External DC and AC Electric Fields

Nekrasov

Smorodin

2022

Microgravity Sci. Technol.

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Chaotic electro-convection flow states of a dielectric liquid between two parallel electrodes

Cited by 14 publications

References 47 publications

Enhanced heat transfer and symmetry breaking in three-dimensional electro-thermo-hydrodynamic convection

Enhanced heat transfer and symmetry breaking in three-dimensional electro-thermo-hydrodynamic convection

Structural characteristics of electrohydrodynamic jets induced by a blade‐plane actuator subjected to highly non‐uniform electric fields: Parametric investigation through the particle image velocimetry techniques

The Electroconvective Flows of a Weakly Conducting Liquid in the External DC and AC Electric Fields

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