A novel numerical approach to find the optimal frequency of Rayleigh–Plateau instability in laminar jet breakup for uniform droplet generation
One of the key aspects of studying Rayleigh-Plateau instability and laminar jet breakup is identifying the optimal disturbance wavelength. By inducing artificial disturbances with an optimal frequency or wavelength in a laminar jet, uniformly sized droplets can be produced. Most existing methods for...
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Elsevier
2025-07-01
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| Series: | Results in Physics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379725001998 |
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| author | Sepehr Mousavi Majid Siavashi |
| author_facet | Sepehr Mousavi Majid Siavashi |
| author_sort | Sepehr Mousavi |
| collection | DOAJ |
| description | One of the key aspects of studying Rayleigh-Plateau instability and laminar jet breakup is identifying the optimal disturbance wavelength. By inducing artificial disturbances with an optimal frequency or wavelength in a laminar jet, uniformly sized droplets can be produced. Most existing methods for calculating the optimal wavelength in Rayleigh-Plateau instability rely on analytical approaches with significant simplifications, leading to various limitations. The main goal of this study is to develop an effective numerical method to identify the optimal frequency in Rayleigh-Plateau instability. First, the numerical results are validated with experimental data. Then, a systematic method for calculating the optimal frequency using simulated data and the discrete Fourier transform (DFT) is proposed. This method serves as an alternative to common trial-and-error methods and inaccurate analytical approaches, providing a low-cost and highly accurate prediction of the optimal frequency. This method is applied to determine the optimal frequency for different flow conditions (WeberWe=6;0.013≤Ohnesorge(Oh)<0.219). Finally, the impact of two parameters, including the inner to outer diameter ratio (b=DI/DO) and the contact angle, on the optimal frequency is examined. The results show that increasing b can increase the optimal frequency by up to 70 %. Additionally, increasing the contact angle from 30° to 120° raises the optimal frequency from 160Hz to 192Hz while Oh=0.013 and b=0.56. |
| format | Article |
| id | doaj-art-a4e0ff0bcb3f4e33a41e09cdb49690ee |
| institution | OA Journals |
| issn | 2211-3797 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
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| series | Results in Physics |
| spelling | doaj-art-a4e0ff0bcb3f4e33a41e09cdb49690ee2025-08-20T02:29:42ZengElsevierResults in Physics2211-37972025-07-017410830510.1016/j.rinp.2025.108305A novel numerical approach to find the optimal frequency of Rayleigh–Plateau instability in laminar jet breakup for uniform droplet generationSepehr Mousavi0Majid Siavashi1Applied Multi-Phase Fluid Dynamics Laboratory, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, IranCorresponding author at: School of Mechanical Engineering, Iran University of Science and Technology, Heydarkhani St., Narmak, Tehran 1684613114, Iran.; Applied Multi-Phase Fluid Dynamics Laboratory, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, IranOne of the key aspects of studying Rayleigh-Plateau instability and laminar jet breakup is identifying the optimal disturbance wavelength. By inducing artificial disturbances with an optimal frequency or wavelength in a laminar jet, uniformly sized droplets can be produced. Most existing methods for calculating the optimal wavelength in Rayleigh-Plateau instability rely on analytical approaches with significant simplifications, leading to various limitations. The main goal of this study is to develop an effective numerical method to identify the optimal frequency in Rayleigh-Plateau instability. First, the numerical results are validated with experimental data. Then, a systematic method for calculating the optimal frequency using simulated data and the discrete Fourier transform (DFT) is proposed. This method serves as an alternative to common trial-and-error methods and inaccurate analytical approaches, providing a low-cost and highly accurate prediction of the optimal frequency. This method is applied to determine the optimal frequency for different flow conditions (WeberWe=6;0.013≤Ohnesorge(Oh)<0.219). Finally, the impact of two parameters, including the inner to outer diameter ratio (b=DI/DO) and the contact angle, on the optimal frequency is examined. The results show that increasing b can increase the optimal frequency by up to 70 %. Additionally, increasing the contact angle from 30° to 120° raises the optimal frequency from 160Hz to 192Hz while Oh=0.013 and b=0.56.http://www.sciencedirect.com/science/article/pii/S2211379725001998Rayleigh-Plateau instabilityDropletCapillary breakupDiscrete Fourier Transform (DFT)Contact angle |
| spellingShingle | Sepehr Mousavi Majid Siavashi A novel numerical approach to find the optimal frequency of Rayleigh–Plateau instability in laminar jet breakup for uniform droplet generation Results in Physics Rayleigh-Plateau instability Droplet Capillary breakup Discrete Fourier Transform (DFT) Contact angle |
| title | A novel numerical approach to find the optimal frequency of Rayleigh–Plateau instability in laminar jet breakup for uniform droplet generation |
| title_full | A novel numerical approach to find the optimal frequency of Rayleigh–Plateau instability in laminar jet breakup for uniform droplet generation |
| title_fullStr | A novel numerical approach to find the optimal frequency of Rayleigh–Plateau instability in laminar jet breakup for uniform droplet generation |
| title_full_unstemmed | A novel numerical approach to find the optimal frequency of Rayleigh–Plateau instability in laminar jet breakup for uniform droplet generation |
| title_short | A novel numerical approach to find the optimal frequency of Rayleigh–Plateau instability in laminar jet breakup for uniform droplet generation |
| title_sort | novel numerical approach to find the optimal frequency of rayleigh plateau instability in laminar jet breakup for uniform droplet generation |
| topic | Rayleigh-Plateau instability Droplet Capillary breakup Discrete Fourier Transform (DFT) Contact angle |
| url | http://www.sciencedirect.com/science/article/pii/S2211379725001998 |
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