“…19 (d)]. From these results, we can see that the motion of the fluid is obviously in a state of synchronous response [ 35 ]. Fig.…”
Section: Resultsmentioning
confidence: 97%
“…The results show that the frequency f of oscillation flow corresponds to the excitation period. The motion of the fluid is in a state of synchronous response [ 35 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The consideration of EHD under the AC/PDC field is necessary from the aspects of both fundamental physical study and application. At present, several important fundamental studies have numerically shown EHD-rich instabilities under an AC field; Smorodin et al [ 35 , 36 ] pointed out that parameter modulation can induce parametric resonance that emerges in hydrodynamic systems. There are three possible patterns of responses.…”
“…19 (d)]. From these results, we can see that the motion of the fluid is obviously in a state of synchronous response [ 35 ]. Fig.…”
Section: Resultsmentioning
confidence: 97%
“…The results show that the frequency f of oscillation flow corresponds to the excitation period. The motion of the fluid is in a state of synchronous response [ 35 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The consideration of EHD under the AC/PDC field is necessary from the aspects of both fundamental physical study and application. At present, several important fundamental studies have numerically shown EHD-rich instabilities under an AC field; Smorodin et al [ 35 , 36 ] pointed out that parameter modulation can induce parametric resonance that emerges in hydrodynamic systems. There are three possible patterns of responses.…”
“…Electrospraying is applied in microfluidic devices and nanotechnology for microencapsulation, fine powder production, or thin film deposition. [8][9][10][11][12] For induced flow, electrostatic precipitation has a very complex interaction between the electric field, gas, and particulate flow. The motion and precipitation of dust particles in electrostatic precipitation depends on the electric field, space charge, gas flow field, and dust particle properties.…”
Section: Introductionmentioning
confidence: 99%
“…Droplets produced by electrospraying are charged which prevents their coagulation and promotes self‐dispersion. Electrospraying is applied in microfluidic devices and nanotechnology for microencapsulation, fine powder production, or thin film deposition . For induced flow, electrostatic precipitation has a very complex interaction between the electric field, gas, and particulate flow.…”
Active flow control with electrohydrodynamics (EHD) force in the channel flow has been numerically investigated for enhancing heat transfer. This study focuses on the effect of electrode bank arrangements and the number of electrodes on corona wind and fluid flow for heat transfer onto a porous medium. Aligned and staggered configurations of electrode banks are compared. The numerical results show that electric field intensity depends on electrical voltage and the number of electrodes. Shear flow is increased with larger numbers of electrodes and in the aligned configuration, resulting in the enhancement of vortex strength. The swirling flow from staggered configurations spread wider than that of aligned configurations, but the aligned configuration produced more turbulence. In addition, the temperature distribution in the channel flow is increased with increasing numbers of electrodes. With the effect of swirling flow, airflow above the porous sample surface is faster leads the heat to more transfer to the porous sample surface. This causes the temperature of porous medium to increase rapidly so the convective heat transfer coefficient on porous medium surface is increased. Finally, the modified case of the numerical results is validated against the experimental results. The experimental flow visualization is based on the incense smoke technique, in order to verify the accuracy of the swirling flow pattern subjected to the electric field. It is shown that the comparison results in both techniques are in good agreement.
The onset of interfacial instability in two-fluid systems using a viscous, leaky dielectric model is studied. The instability arises as a result of resonance between the parametric frequency of an imposed electric field and the system’s natural frequency. In addition to a rigorous model that uses Floquet instability analysis, where both viscous and charge effects are considered, this study also provides convincing validating experiments. In other results, it is shown that (a) the imposition of a periodic electrostatic potential acts to counter gravity and this countering effect becomes more effective if a DC voltage is also added, (b) a critical DC voltage exists at which the interface becomes unstable such that no parametric frequency is required to completely destabilize the interface and (c) the leaky dielectric model approaches a model for a perfect dielectric/perfect conductor pair as the conductivity ratio becomes large. It is also shown via experiments that parametric resonant instability using electrostatic forcing may be reliably used to estimate interfacial tension to sufficient accuracy.
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