Flow rate influencing effects of micropumps

Jenke, Christoph; Kager, Simone; Richter, M.; Kutter, Christoph

doi:10.1016/j.sna.2018.04.025

Cited by 12 publications

(9 citation statements)

References 17 publications

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“…When applying field strengths above 95% against the direction of polarization, the material starts to show first depolarizing effects. Even though the symmetric driving at 95% of E c introduces larger hysteresis in the material, this kind of actuation can be useful for systems with closed loop control or for systems with periodic operation as in the case of a micropump [5,30].…”

Section: Electric Operation Regionmentioning

confidence: 99%

Properties of piezoceramic materials in high electric field actuator applications

Bruno

Fahmy

Stürmer

et al. 2018

Smart Mater. Struct.

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In this paper, we compare the performance of 8 PZT ceramics and one PMN-PT material for typical bending actuator applications. This includes the measurement of nonlinear transverse charge coefficient at high electric field strength and related quantities such as the Young's modulus, relative permittivity, coercive field and their temperature dependencies, and the Curie temperature. Most materials show much higher strains than what is expected from the datasheet values. We further study the operating region for fields against the polarization direction in different operating cycles and demonstrate a long-term stable quick re-poling method which increases the operating range of negative-only cycles from 50% of E c to 66% of E c .

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Section: Electric Operation Regionmentioning

confidence: 99%

Properties of piezoceramic materials in high electric field actuator applications

Bruno

Fahmy

Stürmer

et al. 2018

Smart Mater. Struct.

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“…A perfectly rectangular actuation generates the fastest actuator movement and therefore the fastest pressure built-up. Consequently, the actuation of the passive flap valves is rapid and backflow through insufficiently closed valves is minimized [30]. A lower flank steepness, as is the case for sinusoidal actuation, leads to a slower pressure built-up and slow opening and closing of the passive valves.…”

Section: Single Stroke Characterisationmentioning

confidence: 99%

“…A lower flank steepness, as is the case for sinusoidal actuation, leads to a slower pressure built-up and slow opening and closing of the passive valves. It therefore allows a portion of the transported fluid to move backwards through the valves [30]. A steeper flank therefore leads to a higher stroke volume.…”

Section: Single Stroke Characterisationmentioning

confidence: 99%

Microfluidic Cell Transport with Piezoelectric Micro Diaphragm Pumps

et al. 2021

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The automated transport of cells can enable far-reaching cell culture research. However, to date, such automated transport has been achieved with large pump systems that often come with long fluidic connections and a large power consumption. Improvement is possible with space- and energy-efficient piezoelectric micro diaphragm pumps, though a precondition for a successful use is to enable transport with little to no mechanical stress on the cell suspension. This study evaluates the impact of the microfluidic transport of cells with the piezoelectric micro diaphragm pump developed by our group. It includes the investigation of different actuation signals. Therewith, we aim to achieve optimal fluidic performance while maximizing the cell viability. The investigation of fluidic properties proves a similar performance with a hybrid actuation signal that is a rectangular waveform with sinusoidal flanks, compared to the fluidically optimal rectangular actuation. The comparison of the cell transport with three actuation signals, sinusoidal, rectangular, and hybrid actuation shows that the hybrid actuation causes less damage than the rectangular actuation. With a 5% reduction of the cell viability it causes similar strain to the transport with sinusoidal actuation. Piezoelectric micro diaphragm pumps with the fluidically efficient hybrid signal actuation are therefore an interesting option for integrable microfluidic workflows.

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“…In particular cases, when the media flow in the pump supply line is disrupted by sporadic gas bubbles, formed from various reasons [14], the pump has to be able to continuously operate with both media; not only at open outlet (without load) but as well at defined load (backpressure-BP), which should be considered a common situation in real application. This is so called bubble tolerance (BT) parameter and is an additional micropump figure of merit.…”

Section: Bubble Tolerancementioning

confidence: 99%

“…A combination of high rectifying elements efficiency yielding good backpressure for pumping liquid (load dependent) and high compression ratio yielding ability to pump air (expelling air from the cylinder) lead to bubble tolerant micropump. There are approaches to avoid such air bubble disruptions but require additional devices or degassing methods, which is inconvenient [14]. In our methodology, bubble tolerance test is performed by interrupting a continuous DI water flow with the introduction of air slugs, 2-4 mm long into the pump suction inlet tube (ID = 1.5 mm) every 10 seconds.…”

Section: Bubble Tolerancementioning

confidence: 99%

Determination of Essential Parameters for Quality Control in Fabrication of Piezoelectric Micropumps

Mozek¹,

Pečar²,

Resnik³

et al. 2019

Quality Management and Quality Control - New Trends and Developments

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Quality control of piezoelectric micropumps is presented through design, fabrication process, operation, and characterization. The presented study resulted in the extraction of a minimal set of monitored parameters, which is a prerequisite for reliable and stable micropump operation. Micropump fabrication process steps, especially bonding process quality, in correlation with quality control of micropump constituent components (housing, elastomer, and piezoelectric actuator) provided an explanation for deterioration of common micropump characteristics, such as flow vs. backpressure, suction pressure, and excitation signal. These characteristics also manifested in deterioration of other important micropump properties, such as self-priming ability, bubble tolerance, long-term stability, heat dissipation, and temperature operating range. Besides air and DI water pumping, chemical compatibility of constituent materials was confirmed during successful long-term testing of micropumps by pumping media with different viscosity and aggressive media with low pH value. The extracted set of parameters defines input control for micropump fabrication process while at the same time establishes safe operating area of fabricated micropumps. The presented set of parameters provides quality control guidelines and enables a direct comparison from pump-to-pump or run-to-run variations and extraction of influencing design or fabrication parameters.

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Flow rate influencing effects of micropumps

Cited by 12 publications

References 17 publications

Properties of piezoceramic materials in high electric field actuator applications

Properties of piezoceramic materials in high electric field actuator applications

Microfluidic Cell Transport with Piezoelectric Micro Diaphragm Pumps

Determination of Essential Parameters for Quality Control in Fabrication of Piezoelectric Micropumps

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