CIESC Journal ›› 2018, Vol. 69 ›› Issue (9): 3814-3824.doi: 10.11949/j.issn.0438-1157.20180483

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Numerical simulation of mono-disperse droplet spray dryer under influence of swirling flow

YANG Shujun1, WEI Yucong1, WOO Meng Wai2, WU Winston Duo1, CHEN Xiao Dong1,2, Xiao Jie1   

  1. 1. China-Australia Joint Research Center in Future Dairy Manufacturing, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China;
    2. Department of Chemical Engineering, Faculty of Engineering, Monash University, Clayton Campus, Victoria, Australia
  • Received:2018-05-07 Revised:2018-06-24
  • Supported by:

    supported by the Natural Science Foundation of Jiangsu Province (BK20170062), the National Key Research and Development Program of China (ISTCP, 2016YFE0101200, 2017YFD0400905), the National Natural Science Foundation of China (21406148), the Jiangsu ShuangChuang Program the Jiangsu Specially-Appointed Professors Program, and the Jiangsu PAPD.


Monodisperse droplet spray dryer (MDSD) has demonstrated great advantages in the production of uniform sized particle products. The drying performance of such facility is improved. By resorting to the discrete phase model (DPM) and the reaction engineering approach (REA) based on drying model, a 3D CFD model is developed to describe a complete MDSD consisting of a small droplet pre-dispersion chamber and a big drying chamber. The model allows to investigate the influence of introducing swirling flows in the pre-dispersion chamber and the drying chamber on particle trajectory and drying dynamics. It is shown that the introduction of the swirling flow at an air inlet angle of 30° can offer decent performance. When both chambers have swirling flows, the co-current scheme is 2% better than the counter-current scheme in terms of reaching lower particle moisture content. Compared with the case without any swirling flow, the particle moisture content can be 30% lower. To achieve the same moisture content, with the introduction of the swirling flow, the dryer can be shortened by nearly 12%.

Key words: mono-disperse droplet spray dryer, discrete phase model, reaction engineering approach based drying model, optimization, multiphase flow

CLC Number: 

  • TQ02

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