The effect of target roughness on the impact phenomena of magnetic fluid drops

Sudo, Seiichi; Funaoka, M; Nishiyama, Hideya; Katagiri, Kazunari

doi:10.1016/s0196-8904(01)00107-8

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…The last pattern refers to that the droplet splits into many daughter droplets. Different from previous studies on the ferrofluid droplet fission phenomenon, ,,, two types of fission processes, i.e., evenly and unevenly distributed sizes of the daughter droplets, are first identified. It is found that the instant when the rim interface instability develops determines the type of the fission and, thus, the size distribution of the daughter droplets.…”

Section: Concluding Remarksmentioning

confidence: 79%

“…When the ferrofluid droplet impacts a solid surface in the presence of a magnetic field, the additional magnetic force can significantly influence the dynamic process. The first systematic studies of ferrofluid droplet impact with the existence of a magnetic field were conducted by Sudo et al − They investigated the influence of the target texture and roughness on the spreading dynamics of the ferrofluid droplet and theoretically analyzed the correlation between the spreading diameter and the magnetic field strength. Rahimi et al and Ahmed et al also experimentally studied the effects of magnetic field strength on the maximum spreading of a ferrofluid droplet, and Ahmed et al developed a theoretical model to predict the maximum spreading diameter based on the energy conservation principle.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Field-Assisted Fission of a Ferrofluid Droplet for Large-Scale Droplet Generation

et al. 2022

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With the presence of an external magnetic field, a ferrofluid droplet exhibits a rich variety of interesting phenomena notably different from nonmagnetic droplets. Here, a ferrofluid droplet impacting on a liquidrepellent surface is systematically investigated using high-speed imaging. The pre-and post-impact, including the droplet stretching, maximum spreading diameter, and final impact modes, are shown to depend on the impact velocity and the magnitude of the external magnetic field. A scaling relation involving the Weber and magnetic Bond numbers is fitted to predict the maximum spreading diameter based on the magnetic field-induced effective surface tension. The impact outcome is also investigated and classified into three patterns depending on the occurrence of the rim interface instability and the fission phenomenon. Two types of fission (i.e., evenly and unevenly distributed sizes of the daughter droplets) are first identified, and the corresponding mechanism is revealed. Last, according to Rayleigh−Taylor instability, a semiempirical formula is proposed to estimate the number of the daughter droplets in the regime of evenly distributed size, which agrees well with the experimental data. The present study can provide more insight into large-scale droplet generation with monodispersive sizes.

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Section: Concluding Remarksmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Magnetic Field-Assisted Fission of a Ferrofluid Droplet for Large-Scale Droplet Generation

et al. 2022

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“…These deformations, caused by magnetic topological instabilities, generate ordered spatial patterns (Fig. 3b), which are influenced and interacted with hydrodynamic instabilities [5,6]. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The impact of magneto-rheological droplets on a flat surface under the influence of a magnetic field was studied by Sudo et al [4][5][6]: The impact of water-based magneto-rheological droplets on a rubber surface was examined [4] by applying a magnetic field in perpendicular as well as in the tangential direction to the droplet velocity axis. It was reported that the post-impact droplet spreading diameter increases with magnetic field intensity.…”

Section: Introductionmentioning

confidence: 99%

“…A qualitative verification of the observation that a magneto-fluid droplet spreading diameter increases with an increase of applied magnetic field was reported in [5] dealing with the sequential impact of two magnetic-fluid droplets on a paper surface. Experimental investigation of the impact phenomena of kerosene-based ferri-colloid drops on target solid surfaces with different roughness was conducted in a following work [6]. They found that the maximum diameter of the impact pattern decreases with the applied magnetic field as well as with the roughness number.…”

Section: Introductionmentioning

confidence: 99%

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