A micro-synthetic jet in a microchannel using bubble growth and collapse

Sourtiji, E.; Peles, Yoav

doi:10.1016/j.applthermaleng.2019.114084

Cited by 11 publications

(5 citation statements)

References 37 publications

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“…Figure 2 depicts different deposition and etching steps employed in the fabrication of the microdevice. A detailed account of the microfabrication processes are provided in the previous studies [29,30].…”

Section: The Micro-device and The Microfabrication Processesmentioning

confidence: 99%

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Hydrodynamic characteristics of an evaporation-based micro-synthetic jet for micro-propulsion

Sourtiji

Peles

2021

J. Micromech. Microeng.

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In this study, a concept of using a synthetic jet for micro-propulsion is introduced. The system has no moving parts and operates based on a periodic process associated with bubble growth and collapse on a micro-heater in a confined chamber. The liquid is propelled through a micro-nozzle located at the chamber exit using the interfacial layer movement between the vapor and liquid phases during the bubble growth. High-speed photography and image processing are used to capture the sequence of bubble ebullition in the chamber. The synthetic jet velocity at the nozzle exit is then numerically simulated using SST k-ω turbulence model and it is shown that the thrust during the ejection phase is two orders of magnitude greater than the rest of the cycle, resulting in a positive net momentum. Comparing the operating power of different types of micro-thrusters revealed that the introduced approach is one of the lowest powered micro-thrusters.

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Section: The Micro-device and The Microfabrication Processesmentioning

confidence: 99%

“…Figure 3 depicts the schematic of the experimental setup including a closed fluid loop, electrical equipment, data acquisition system and visualization equipment [29,30]. Since the HFE-7000 has a low boiling point, it requires low operating powers and was considered for this experiment.…”

Section: Experimental Set-upmentioning

confidence: 99%

Hydrodynamic characteristics of an evaporation-based micro-synthetic jet for micro-propulsion

Sourtiji

Peles

2021

J. Micromech. Microeng.

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“…When placed asymmetrically in a channel with reservoirs at either end, a momentum imbalance upon collapse results in a net fluid pumping effect [ 5 , 13 , 16 , 17 , 18 ]. Beyond simple pumping, thermal bubble-driven micro-pumps are successfully used as micro-mixers [ 19 ], fluid jets [ 20 ], fluid sorters/routers [ 4 ], and have been used for decades in commercial inkjet printers [ 21 ]. Yet, to enable commercial lab-on-a-chip systems, thermal bubble-driven micro-pumps must be studied with respect to biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

Rapid Fabrication of Low-Cost Thermal Bubble-Driven Micro-Pumps

et al. 2022

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Thermal bubble-driven micro-pumps are an upcoming actuation technology that can be directly integrated into micro/mesofluidic channels to displace fluid without any moving parts. These pumps consist of high power micro-resistors, which we term thermal micro-pump (TMP) resistors, that locally boil fluid at the resistor surface in microseconds creating a vapor bubble to perform mechanical work. Conventional fabrication approaches of thermal bubble-driven micro-pumps and associated microfluidics have utilized semiconductor micro-fabrication techniques requiring expensive tooling with long turn around times on the order of weeks to months. In this study, we present a low-cost approach to rapidly fabricate and test thermal bubble-driven micro-pumps with associated microfluidics utilizing commercial substrates (indium tin oxide, ITO, and fluorine doped tin oxide, FTO, coated glass) and tooling (laser cutter). The presented fabrication approach greatly reduces the turn around time from weeks/months for conventional micro-fabrication to a matter of hours/days allowing acceleration of thermal bubble-driven micro-pump research and development (R&D) learning cycles.

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“…Similar technology is also used for microvalves and micropumps based on thermal bubble actuated microfluidic chips [13]. A micro-synthetic jet [14] is also based on micro heaters technology. More complicated microheaters are used for atomization of high-viscosity fluids [15] In a typical thermal inkjet arrangement, when a current is applied to the resistor for a short time (a few microseconds) [16], it heats the surrounding fluid in its immediate vicinity and causes local boiling (micro-boiling, MB).…”

Section: Introductionmentioning

confidence: 99%

Thin-Film MEMS Resistors with Enhanced Lifetime for Thermal Inkjet

2020

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In this paper, the failure mechanisms of the thermal inkjet thin-film resistors are recognized. Additionally, designs of resistors to overcome these mechanisms are suggested and tested by simulation and experiment. The resulting resistors are shown to have improved lifetimes, spanning an order of magnitude up to 2 × 109 pulses. The thermal failure mechanisms were defined according to the electric field magnitude in three critical points—the resistor center, the resistor–conductor edge, and the resistor thermal “hot spots”. Lowering the thermal gradients between these points will lead to the improved lifetime of the resistors. Using MATLAB PDE simulations, various resistors shapes, with different electric field ratios in the hot spots, were designed and manufactured on an 8″ silicon wafer. A series of lifetime experiments were conducted on the resistors, and a strong relation between the shape and the lifetime of the resistor was found. These results have immediate ramifications regarding the different printing apparatuses which function with thermal inkjet technology, allowing the commercial production of larger thermal printheads with high MTBF rate. Such heads may fit fast and large 3D printers.

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A micro-synthetic jet in a microchannel using bubble growth and collapse

Cited by 11 publications

References 37 publications

Hydrodynamic characteristics of an evaporation-based micro-synthetic jet for micro-propulsion

Hydrodynamic characteristics of an evaporation-based micro-synthetic jet for micro-propulsion

Rapid Fabrication of Low-Cost Thermal Bubble-Driven Micro-Pumps

Thin-Film MEMS Resistors with Enhanced Lifetime for Thermal Inkjet

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