Polytechnic University of Valencia Congress, 21st International Drying Symposium

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Coating effect of micro-sized droplets impacting on low temperature spherical particles
Xiusheng Wu, Xiaoyu Ma, Qing Xu, Zhanyong Li, Ruifang Wang

Last modified: 02-01-2019


In this paper, the effect of spray droplets on the coating of cold spherical particles was studied.The microcapsule granulator produces micron-sized droplets to coat the spherical particles in cold storage, and the high-definition camera and precision balance are used to photograph and weigh the particles before and after the spraying. The droplets are obtained by using the image and data processing technology coating area and coating quality, the droplet coating effect was evaluated by a number of dimensionless parameters such as coating ratio and mass ratio.By orthogonal design experiment and uncertainty analysis, the effects of droplet size and flow rate, spherical particle temperature and diameter on coating effect were studied, and the effect of droplet group coating on low temperature spherical particles was obtained.

Keywords: Spray freeze drying; Droplets; Coating; Spherical particles.


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