TY  - CONF
AU  - Cvetinović, Dejan
AU  - Erić, Aleksandar
AU  - Ćetenović, Nikola
AU  - Čantrak, Đorđe
AU  - Jaroslav, Tihon
AU  - Nakabe, Kazuyoshi
PY  - 2023
UR  - http://www.ssm.kg.ac.rs/congress_2023/papers/
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12377
AB  - The controlled modulation of the nozzle exit velocity acts as a disturbance source, superimposing the natural disturbances in axisymmetric turbulent air jets. The modulation controls the vortex roll-up, and thus the overall vortex structure in the jet. The vortex structures have a significant influence on the heat transfer properties of the jet configurations. The jet can be modulated by an external source of low amplitude oscillations or by self-sustaining oscillations generated by the operation of the specially designed whistler nozzles. The aim of the experimental investigations, mathematical modelling and numerical simulations was to investigate the properties and vortex structures of acoustically modified and non-modified jets and to find an efficient way to control them.This study can serve as a basis for further development and optimisation of technological processes related to air nozzles. The paper presents the results of experimental research and mathematical modelling and numerical simulation of free and impinging turbulent axisymmetric modified and not modified air jets.
PB  - Belgrade : Serbian Society of Mechanics
C3  - ICSSM 2023 : 9th International Congress of the Serbian Society of Mechanics : Proceedings
T1  - Experimental investigation and mathematical modelling of vortex structures found at impinging turbulent axisymetric air jet modified by low-amplitude sound modulation
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12377
ER  - 

@conference{
author = "Cvetinović, Dejan and Erić, Aleksandar and Ćetenović, Nikola and Čantrak, Đorđe and Jaroslav, Tihon and Nakabe, Kazuyoshi",
year = "2023",
abstract = "The controlled modulation of the nozzle exit velocity acts as a disturbance source, superimposing the natural disturbances in axisymmetric turbulent air jets. The modulation controls the vortex roll-up, and thus the overall vortex structure in the jet. The vortex structures have a significant influence on the heat transfer properties of the jet configurations. The jet can be modulated by an external source of low amplitude oscillations or by self-sustaining oscillations generated by the operation of the specially designed whistler nozzles. The aim of the experimental investigations, mathematical modelling and numerical simulations was to investigate the properties and vortex structures of acoustically modified and non-modified jets and to find an efficient way to control them.This study can serve as a basis for further development and optimisation of technological processes related to air nozzles. The paper presents the results of experimental research and mathematical modelling and numerical simulation of free and impinging turbulent axisymmetric modified and not modified air jets.",
publisher = "Belgrade : Serbian Society of Mechanics",
journal = "ICSSM 2023 : 9th International Congress of the Serbian Society of Mechanics : Proceedings",
title = "Experimental investigation and mathematical modelling of vortex structures found at impinging turbulent axisymetric air jet modified by low-amplitude sound modulation",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12377"
}

Cvetinović, D., Erić, A., Ćetenović, N., Čantrak, Đ., Jaroslav, T.,& Nakabe, K.. (2023). Experimental investigation and mathematical modelling of vortex structures found at impinging turbulent axisymetric air jet modified by low-amplitude sound modulation. in ICSSM 2023 : 9th International Congress of the Serbian Society of Mechanics : Proceedings
Belgrade : Serbian Society of Mechanics..
https://hdl.handle.net/21.15107/rcub_vinar_12377

Cvetinović D, Erić A, Ćetenović N, Čantrak Đ, Jaroslav T, Nakabe K. Experimental investigation and mathematical modelling of vortex structures found at impinging turbulent axisymetric air jet modified by low-amplitude sound modulation. in ICSSM 2023 : 9th International Congress of the Serbian Society of Mechanics : Proceedings. 2023;.
https://hdl.handle.net/21.15107/rcub_vinar_12377 .

Cvetinović, Dejan, Erić, Aleksandar, Ćetenović, Nikola, Čantrak, Đorđe, Jaroslav, Tihon, Nakabe, Kazuyoshi, "Experimental investigation and mathematical modelling of vortex structures found at impinging turbulent axisymetric air jet modified by low-amplitude sound modulation" in ICSSM 2023 : 9th International Congress of the Serbian Society of Mechanics : Proceedings (2023),
https://hdl.handle.net/21.15107/rcub_vinar_12377 .

TY  - JOUR
AU  - Cvetinović, Dejan
AU  - Ukai, Munenori
AU  - Nakabe, Kazuyoshi
AU  - Suzuki, Kenjiro
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12386
AB  - The purpose of this study is the experimental investigation on self-sustained oscillating jet characteristics. Main aim was to describe vertical structures of turbulent air jet issuing from the nozzle of special configuration modified by the controlled oscillations in free jet setup. In the present experiments was used so-called "whistler nozzle", a simple-structured device capable to induce self-sustained excitations with controllable frequencies depending on the nozzle geometrical configuration. The frequency of the excitation measured with a far-field condenser microphone probe was around 1-2 kHz. The jet Reynolds number was in the range 48,000-95,000 in all experimental conditions presented in this paper. Flow field velocity measurements were provided in the free jet setup, with and without self-sustained excitations. The images of both free and impinging jets were taken with a high-speed digital video camera. The flow field and structure of the jet were found to be extremely sensitive to the excitation and dependent on the excitation conditions. This fact can lead to the conclusion that the local heat transfer characteristics of jet impingement are also remarkably dependent on the jet excitation.
T2  - Thermal Science
T1  - Velocity measurements and flow structure visualizations of a self-sustained oscillating jet
VL  - 10
IS  - 2
SP  - 113
EP  - 125
DO  - 10.2298/TSCI0602113C
ER  - 

@article{
author = "Cvetinović, Dejan and Ukai, Munenori and Nakabe, Kazuyoshi and Suzuki, Kenjiro",
year = "2006",
abstract = "The purpose of this study is the experimental investigation on self-sustained oscillating jet characteristics. Main aim was to describe vertical structures of turbulent air jet issuing from the nozzle of special configuration modified by the controlled oscillations in free jet setup. In the present experiments was used so-called "whistler nozzle", a simple-structured device capable to induce self-sustained excitations with controllable frequencies depending on the nozzle geometrical configuration. The frequency of the excitation measured with a far-field condenser microphone probe was around 1-2 kHz. The jet Reynolds number was in the range 48,000-95,000 in all experimental conditions presented in this paper. Flow field velocity measurements were provided in the free jet setup, with and without self-sustained excitations. The images of both free and impinging jets were taken with a high-speed digital video camera. The flow field and structure of the jet were found to be extremely sensitive to the excitation and dependent on the excitation conditions. This fact can lead to the conclusion that the local heat transfer characteristics of jet impingement are also remarkably dependent on the jet excitation.",
journal = "Thermal Science",
title = "Velocity measurements and flow structure visualizations of a self-sustained oscillating jet",
volume = "10",
number = "2",
pages = "113-125",
doi = "10.2298/TSCI0602113C"
}

Cvetinović, D., Ukai, M., Nakabe, K.,& Suzuki, K.. (2006). Velocity measurements and flow structure visualizations of a self-sustained oscillating jet. in Thermal Science, 10(2), 113-125.
https://doi.org/10.2298/TSCI0602113C

Cvetinović D, Ukai M, Nakabe K, Suzuki K. Velocity measurements and flow structure visualizations of a self-sustained oscillating jet. in Thermal Science. 2006;10(2):113-125.
doi:10.2298/TSCI0602113C .

Cvetinović, Dejan, Ukai, Munenori, Nakabe, Kazuyoshi, Suzuki, Kenjiro, "Velocity measurements and flow structure visualizations of a self-sustained oscillating jet" in Thermal Science, 10, no. 2 (2006):113-125,
https://doi.org/10.2298/TSCI0602113C . .