Impacting between LM/Ferrofluid Droplets and Surfaces

The study of droplet interactions with surfaces encompasses intricate physical phenomena, including splashing, spreading, and bouncing, which bear relevance to a myriad of fundamental applications such as heat transfer management, inkjet printing, energy harvesting, and anti-icing. These interactions are governed by diverse factors including surface tension, contact angle, wettability, surface roughness, and external environmental conditions. This thesis aims to explore the mechanisms underlying droplet behavior, with a focus on LM/ferrofluid and water droplets, across various surfaces including liquid-coated surfaces, superhydrophobic surfaces.

Initiating from an investigation into the dynamics of LM droplets bouncing on thin liquid-coated surfaces, high-speed camera recordings were employed to capture pivotal events such as droplet spreading, retracting, and bouncing. An energy analysis was conducted to prognosticate bouncing parameters including contact time and bouncing height, thus furnishing valuable insights into LM droplet behavior. Additionally, this study delineated criteria for abnormal LM droplet bouncing phenomena and unveiled the corresponding mechanisms.

Subsequently, we investigated the dynamics of ferrofluid droplets obliquely impacting superhydrophobic surfaces under the influence of a magnetic field. Our particular focus was on the characteristics of the ferrofluid droplets. At high Bond numbers, the magnetic field had a positive effect on increasing the critical Weber number for droplet bouncing. This finding has practical implications in areas such as anti-icing, self-cleaning, and energy harvesting. The observed significant influence in spreading parameter holds promise for improving the effectiveness of these applications. Leveraging this mechanism, a simple demonstration experiment generator was fabricated to showcase electricity generation. This study thus provides valuable insights into the utilization of ferrofluid droplets in ink-jet printing and energy harvesting. Leveraging this mechanism, a simple demonstration experiment generator was fabricated to showcase electricity generation. This study thus provides valuable insights into the utilization of ferrofluid droplets in ink-jet printing and energy harvesting.

In the final part of this study, the dynamics of ferrofluid droplets impacting superhydrophobic surfaces were explored through numerical simulations. In the entire magnetic fluid motion model, the article uses the phase field method and laminar flow model to simulate the magnetic fluid and couple the static magnetic field. First, the magnetic field distribution in space is solved to solve the droplet motion. Then, using the stretching model of magnetic fluid droplets in a magnetic field to compare with experimental results, it is worth noting that the predictions of this numerical simulation are in good agreement with the experimental results.

In summary, this study delves into the impact phenomena between droplets and interfaces, with a particular emphasis on two parameters: droplet bounce characteristics and spreading parameter. This not only sheds light on the fundamental physical mech anisms governing droplet motion but also offers novel insights for the application of droplets in areas such as inkjet printing, energy harvesting, and thermal management.

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