Annular Impinging Jet Controlled by Radial Synthetic Jets

Trávníček, Z.; Tesař, Václav; Broučková, Zuzana; Peszyński, K.

doi:10.1080/01457632.2014.889467

Cited by 24 publications

(12 citation statements)

References 33 publications

(28 reference statements)

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“…(6), (7) and (8)) natural frequencies fn are presented in Table 2 Absolute errors of theoretical data -respect to the experimental data -for values calculated from Eq. (6) and (7) are similar for all actuators. It is about 30% for Eq.…”

Section: Discussionmentioning

confidence: 67%

“…The environmental fluid fills the SJA cavity during the ingestion phase. Thanks to formation of the edge vortices, the SJs are used in many fields of technology including: aviation [1,2], transport [3,4], heat transport [5][6][7], active flow control [7][8][9] and so on. Due to many applications, SJs are produced with the use of many types of different actuators (in terms of construction and type) so as to increase the SJ efficiency or velocity.…”

Section: Introductionmentioning

confidence: 99%

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Synthetic jet actuator with two opposite diaphragms

Smyk

Wawrzyniak

Peszyński

2020

Mechanics and Mechanical Engineering

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The synthetic jet actuators are one of the most investigated types of actuators used in heat transfer and active flow control. The energetic efficiency of actuators is a key parameter determining the possibility of device use. The actuators with two or more diaphragms have higher efficiency than the actuators with only one. The paper presents the investigations of the acoustic synthetic jet actuator with two opposite diaphragms. In the paper, synthetic jet velocity, Reynolds number and the energetic efficiency as a function of oscillating actuator frequency, for a different cavity, orifice configuration and one real input power P0 = 2 W were studied. The possibility of theoretical calculation of first and second resonance frequency were checked. The coupling ratio for actuators was calculated. The maximum energetic efficiency was η = 8.67% and Reynolds number Re = 8503. The possibility of using the same dependencies and rules during the design of actuators with two opposite diaphragms as in the case of actuators with one diaphragm was demonstrated. The results may be useful in the design of the actuators of the two membranes.

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Section: Discussionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Synthetic jet actuator with two opposite diaphragms

Smyk

Wawrzyniak

Peszyński

2020

Mechanics and Mechanical Engineering

Self Cite

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“…Since that time, SJs for cooling applications have been investigated by many other authors [50][51][52][53][54][55][56][57][58], including previous work e.g. [59]. A majority of these studies have focused on air SJ impinging on a wall.…”

Section: Synthetic Jetsmentioning

confidence: 99%

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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“…This study highlighted in detail the physical process of the transition from the additional jet to the wall jet. The annular nozzle used in one paper [26] was designed with an active flow control system, which uses 12 synthetic jets to eject radially from the central nozzle body. It also measures the control effect on the impact wall, focusing on the generation and control of the annular impinging jet.…”

Section: Introductionmentioning

confidence: 99%

Effect of Closure Characteristics of Annular Jet Mixed Zone on Inspiratory Performance and Bubble System

Wang

et al. 2021

Processes

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In the flotation process, gas-liquid properties and the bubble system greatly influence bubble mineralization. In order to clarify how the mechanism applies to the closure characteristics of an annular jet mixed flow zone on the inspiratory performance and the bubble system, different degrees of closure on the velocity field and gas-liquid ratio in the mixed flow zone were investigated using numerical simulation. The variations in the characteristics of bubble size distribution, rising velocity, and gas content under different closure levels were measured with a high-speed dynamic camera technology. The results confirmed that when the closure degrees of the mixed flow zone improved, the inlet jet could gradually overcome the static pressure outside the nozzle effectively. It formed a gas-liquid mixing zone with high turbulence first, and a large pressure difference at the gas-liquid junction second. This helped to increase the inspiratory capacity. At the same time, the gas-liquid ratio rose gradually under conditions of constant flow. When the nozzle outlet was completely closed, the gas-liquid ratio gradually stabilized. For the bubble distribution system, an enhancement in the closure degrees can effectively reduce the bubble size, and subsequently, the bubble size distribution became more uniform. Due to the improved gas-liquid shear mixing, the aspect ratio of the bubbles can be effectively changed, consequently reducing the bubble rising speed and increasing the gas content and bubble surface area flux of the liquid.

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Annular Impinging Jet Controlled by Radial Synthetic Jets

Cited by 24 publications

References 33 publications

Synthetic jet actuator with two opposite diaphragms

Synthetic jet actuator with two opposite diaphragms

Synthetic and Continuous Jets Impinging on a Circular Cylinder

Effect of Closure Characteristics of Annular Jet Mixed Zone on Inspiratory Performance and Bubble System

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