Electrohydrodynamic pumping of dielectric liquids

Seyed-Yagoobi, J.

doi:10.1016/j.elstat.2005.03.047

Cited by 192 publications

(70 citation statements)

References 20 publications

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“…use ion drag as the force to drive the fluid. However, most of the micropumps in the literature referred to as being ion-drag pumps are injection-type EHD pumps (Darabi et al 2002, Seyed-Yagoobi 2005.…”

Section: Ion-dragmentioning

confidence: 99%

Recent advances in microscale pumping technologies: a review and evaluation

Iverson

Garimella

2008

Microfluid Nanofluid

421

249

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Micropumping has emerged as a critical research area for many electronics and biological applications. A significant driving force underlying this research has been the integration of pumping mechanisms in micro Total Analysis Systems (μTAS) and other multi-functional analysis techniques. Uses in electronics packaging and micromixing and microdosing systems have also capitalized on novel pumping concepts. The present work builds upon a number of existing reviews of micropumping strategies by focusing on the large body of micropump advances reported in the very recent literature. Critical selection criteria are included for pumps and valves to aid in determining the pumping mechanism that is most appropriate for a given application. Important limitations or incompatibilities are also addressed. Quantitative comparisons are provided in graphical and tabular forms.

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Section: Ion-dragmentioning

confidence: 99%

Recent advances in microscale pumping technologies: a review and evaluation

Iverson

Garimella

2008

Microfluid Nanofluid

421

249

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“…However, piezoelectric units generally require operating voltages larger than 100 V (13,15). Alternatively, nonmechanical pumps with no moving parts generate a driving force using ions energized via electrohydrodynamic (16), electroosmotic (17), or electrochemical (18,19) effects. However, ion pumps are generally only applicable for low-conductivity liquids, produce relatively low flow rates, and need very high voltages (in the order of kilovolts) to operate (13).…”

mentioning

confidence: 99%

Liquid metal enabled pump

Tang¹,

Khoshmanesh²,

Sivan³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

320

285

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Small-scale pumps will be the heartbeat of many future micro/ nanoscale platforms. However, the integration of small-scale pumps is presently hampered by limited flow rate with respect to the input power, and their rather complicated fabrication processes. These issues arise as many conventional pumping effects require intricate moving elements. Here, we demonstrate a system that we call the liquid metal enabled pump, for driving a range of liquids without mechanical moving parts, upon the application of modest electric field. This pump incorporates a droplet of liquid metal, which induces liquid flow at high flow rates, yet with exceptionally low power consumption by electrowetting/deelectrowetting at the metal surface. We present theory explaining this pumping mechanism and show that the operation is fundamentally different from other existing pumps. The presented liquid metal enabled pump is both efficient and simple, and thus has the potential to fundamentally advance the field of microfluidics.E ngines are systems that convert different kinds of energy into mechanical motion, which are used in various microscale systems, including laboratory-on-a-chip microreactors (1-3), microelectromechanical (MEMS) actuators (4), and microscale heat exchangers (5, 6), to name just a few. Some of the most important members of the engine family are liquid pumps. In the small-scale regime, such pumps can be mainly classified into mechanical and nonmechanical. For mechanical pumps, the driving force is generated by moving parts that are energized using piezoelectric (7), electrostatic (8), thermopneumatic (9), pneumatic (10), electromagnetic (11) effects, or deformation through electrowetting (12). Mechanical pumping systems have several drawbacks, which largely stem from the fact that moving parts cause energy loses due to heat generated by friction and their rather complicated fabrication processes (13,14). In addition, the existence of moving parts increases the potential for failure, which can become acute in complex systems and which could potentially include numerous pumps. Among the varieties of mechanical pumps, only piezoelectric units can produce high flow rates as large as 20,000 μL/min at relatively low input power (>50 mW) (13, 15). However, piezoelectric units generally require operating voltages larger than 100 V (13, 15). Alternatively, nonmechanical pumps with no moving parts generate a driving force using ions energized via electrohydrodynamic (16), electroosmotic (17), or electrochemical (18, 19) effects. However, ion pumps are generally only applicable for low-conductivity liquids, produce relatively low flow rates, and need very high voltages (in the order of kilovolts) to operate (13). Therefore, a pumping system with no moving parts, high flow rate, and low power consumption is ideal for many present-day and emerging applications in microfluidic systems. An ambitious vision is that such pumps can potentially be used for moving small objects on demand, assembling them to create new structures, or could ...

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“…The increment of pressure amplitude is approximately 222 Pa from 0.01 Hz to 0.05 Hz. Equation (5) indicates that the maximum pressure is changed as a result of the change in permittivity. The effect of the permittivity on the amplitude will be discussed in a future study, which will include detailed experimental results.…”

Section: Present Pumpmentioning

confidence: 99%

“…Electrohydrodynamic pumps produce no vibrations, dissipate little power, and require no mechanical moving parts. Studies on the oscillating flow generated by EHD pumping remain scarce, whereas the unidirectional flow generation induced by EHD pumping at AC and DC voltages has been investigated extensively (5), (6) . The existence of EHD induced oscillatory gas flow was revealed only recently (7) .…”

Section: Introductionmentioning

confidence: 99%

Development of an Electrohydrodynamic (EHD) Micropump to Generate Oscillating Flow at Low Frequencies

Fujiwara

Kano

Takahashi

2010

JAMDSM

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An electrohydrodynamic (EHD) micropump to generate oscillating flow is newly developed and experimentally tested using an arrangement of thin stainless steel wires. A working fluid is accelerated from the charged electrode to the ground electrode by a high electric field. The electric body force responsible for this acceleration is primarily the Coulomb force. To increase the electric filed, the distance between the charged and ground electrodes is 0.2 mm. The size of the present EHD pump is 24×30×7.8 mm. Since the pressure increases with the increase in the number of the electrode pairs, a pumping channel fabricated in this EHD pump is bent in parallel so as to increase the number of electrode pairs. This channel has the dimensions of 24×48×0.9 mm, in which ten pairs of electrodes are fabricated. The maximum static pressure generated by the present EHD pump is approximately 550 Pa at an input of DC 1 kV, and the maximum flow rate is 4.3 ml/min at the unloaded condition. In order to generate symmetric oscillating flows, alternating voltage is applied. The present EHD pump is demonstrated to successfully generate symmetric oscillating flows at low frequencies (0.01 Hz ~ 0.05 Hz)

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Electrohydrodynamic pumping of dielectric liquids

Cited by 192 publications

References 20 publications

Recent advances in microscale pumping technologies: a review and evaluation

Recent advances in microscale pumping technologies: a review and evaluation

Liquid metal enabled pump

Development of an Electrohydrodynamic (EHD) Micropump to Generate Oscillating Flow at Low Frequencies

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