Axis-switching of a micro-jet

Cabaleiro, Juan Martin; Aider, Jean-Luc

doi:10.1063/1.4868256

Cited by 5 publications

(10 citation statements)

References 13 publications

(13 reference statements)

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“…However, these seemingly contrasting conclusions [21] and [24] are valid only for specific parameters (for pulsed [21] and continuous micro-jets [24]) that cannot be generalized. Nevertheless, the topic of the (pulsed and continuous) micro-jets remains still quite unexplored.…”

Section: Microjets and Very Low Reynolds Number Jetsmentioning

confidence: 99%

“…Gau et al [24] concluded a complete absence of the vortices in the microjet while Cabaleiro and Aider [21] claim the existence of the vortices and their necessity because of the axisswitching phenomenon. However, these seemingly contrasting conclusions [21] and [24] are valid only for specific parameters (for pulsed [21] and continuous micro-jets [24]) that cannot be generalized.…”

Section: Microjets and Very Low Reynolds Number Jetsmentioning

confidence: 99%

“…[24] the micro-jet is vortex-free, Cabaleiro and Aider [21] proved the existence of the axisswitching in the examined micro-jets of the Reynolds numbers 263.5 and 137. The detailed DNS revealed the existence of the vortex ring in the close vicinity of the exit orifice and it is believed this vortex ring is responsible for the axis-switching in the examined cases.…”

Section: Microjets and Very Low Reynolds Number Jetsmentioning

confidence: 99%

“…Cabaleiro and Aider [21] performed the experiments and the direct numerical simulation (DNS) concentrated on the axis-switching of a pulsed micro-jet. The exit nozzle had the width B = 380 µm and the aspect ratio 6.5.…”

Section: Microjets and Very Low Reynolds Number Jetsmentioning

confidence: 99%

“…The term "microjet" is used to express small cross-section jet sizes -usually when at least one dimension is lower than 1 mm, see Cabaleiro and Aider [21].…”

Section: Microjets and Very Low Reynolds Number Jetsmentioning

confidence: 99%

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Synthetic and Continuous Jets Impinging on a Circular Cylinder

Broučková

Trávníček

Vít

2018

Heat Transfer Engineering

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Declaration of authorshipI hereby confirm that the submitted work is entirely my own and was written only with help of referenced literature. iv AbstractSynthetic and continuous jets impinging onto an heated circular cylinder were investigated.The study was performed experimentally. For this reason, a piezoelectrically driven actuator with water as the working fluid was designed. The basic parameters of the experiments were: the slot nozzle width was 0.36 mm, the aspect ratio of the slot was 111, the cylinder diameter was 1.2 mm, and the cylinder-to-nozzle spacing related to the slot width was 5-21.

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Section: Microjets and Very Low Reynolds Number Jetsmentioning

confidence: 99%

Section: Microjets and Very Low Reynolds Number Jetsmentioning

confidence: 99%

Section: Microjets and Very Low Reynolds Number Jetsmentioning

confidence: 99%

Section: Microjets and Very Low Reynolds Number Jetsmentioning

confidence: 99%

“…The term "microjet" is used to express small cross-section jet sizes -usually when at least one dimension is lower than 1 mm, see Cabaleiro and Aider [21].…”

Section: Microjets and Very Low Reynolds Number Jetsmentioning

confidence: 99%

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Synthetic and Continuous Jets Impinging on a Circular Cylinder

Broučková

Trávníček

Vít

2018

Heat Transfer Engineering

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Control of air micro-jets by the use of dielectric barrier discharges

Eijo

Sosa

Aider

et al. 2020

Sensors and Actuators A: Physical

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In this study, we used Dielectric Barrier Discharge (DBD) Plasma Actuators to control and pulse two-dimensional free air micro-jets at low Reynolds numbers (Re < 200), avoiding the use of mobile and mechanical devices such as, for example, valves. We performed experimental measurements and visualizations to characterize the effect of different DBD burst frequencies (1 Hz to 80 Hz) and different DBD applied voltages, on both the external and internal flows. Preliminary results show an increase in the external flow rate (20 %) and a promising and effective method to pulse micro-jets at these frequencies.

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Interaction between a laminar starting immersed micro-jet and a parallel wall

2015

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In the present work, we study the starting transient of an immersed micro-jet in close vicinity to a solid wall parallel to its axis. The experiments concern laminar jets (Re < 200) issuing from a 100 µm internal tip diameter glass micro-pipette. The effect of the confinement was studied placing the micro-pipette at different distances from the wall. The characterization of the jet was carried out by visualizations on which the morphology of the vortex head and trajectories was analyzed. Numerical simulations were used as a complementary tool for the analysis. The jet remains stable for very long distances away from the tip allowing for a similarity analysis. The self-similar behavior of the starting jet has been studied in terms of the frontline position with time. A symmetric and a wall dominated regime could be identified. The starting jet in the wall type regime, and in the symmetric regime as well, develops a self-similar behavior that has a relative rapid loss of memory of the preceding condition of the flow. Scaling for both regimes are those that correspond to viscous dominated flows.

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Axis-switching of a micro-jet

Cited by 5 publications

References 13 publications

Synthetic and Continuous Jets Impinging on a Circular Cylinder

Synthetic and Continuous Jets Impinging on a Circular Cylinder

Control of air micro-jets by the use of dielectric barrier discharges

Interaction between a laminar starting immersed micro-jet and a parallel wall

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