Abstract
An intensive training course has been developed and implemented at the California State University Long Beach based on 8 years of experience in the multiphase flow area with the specific focus on droplet–solid interactions. Due to the rapid development of droplet-based equipment and industrial techniques, numerous industries are concerned with understanding the behavior of droplet dynamics and the characteristics that govern them. The presence and ensuing characteristics of the droplet regimes (spreading, receding, rebounding, and splashing) are heavily dependent on droplet and surface conditions. The effect of surface temperature, surface wettability, impact velocity, droplet shape and volume on droplet impact dynamics, and heat transfer are discussed in this training paper. Droplet impacts on moving solid surfaces and the effects of normal and tangential velocities on droplet dynamics are other topics that are discussed here. Despite the vast amount of studies into the dynamics of droplet impact, there is still much more to be investigated as research has expanded into a myriad of different conditions. However, the current paper is intended as a practical training document and a source of basic information, therefore, the scope is kept sufficiently broad to be of interest to readers from different engineering disciplines.
Highlights
This paper summarizes an intensive course on the subject of multiphase flow with the focus on both the theoretical and practical knowledge on droplet–solid interactions
Droplet impact dynamics are widely studied as further improvements in understanding of droplet behavior due to the variety of their industrial applications
With decreasing asymmetry the to freeze due to an increase in mass. This experiment demonstrated the predominance of droplet droplet showed a reduced rebound height. This suggests that suppression of droplet rebound can be volume over the effects ofellipticity droplet dynamics on freezing time due to spent during the induced by variances in its and asymmetry
Summary
This paper summarizes an intensive course on the subject of multiphase flow with the focus on both the theoretical and practical knowledge on droplet–solid interactions. Most research studies the effect of droplet’s inflight behaviors such as velocity, temperature, and trajectory, and their interaction with the substrate’s temperature and roughness on the process of droplet solidification and coating structure [27,28,29,30,31,33,34,35,36,37,38] Another importance of fundamental study in the droplet impact field is its application in spray cooling, where an array of small droplets is applied to a heated surface as a cooling mechanism to enhance its heat transfer [39,40,41,42,43,44]. Ratio of the total heat Q transferred to the droplet to the maximal possible heat transfer
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