Mathematical model and numerical investigation of the influence of spray drying parameters on granule sizes of mold powder--颗粒学报PARTICUOLOGY

Zhang, F., Lu, Y., Zhu, S., Han, F., Wen, G., Tang, P., & Hou, Z. (2024). Mathematical model and numerical investigation of the influence of spray drying parameters on granule sizes of mold powder. Particuology, 85, 280-295. https://doi.org/10.1016/j.partic.2023.06.017

Mathematical model and numerical investigation of the influence of spray drying parameters on granule sizes of mold powder

Fei Zhang ^{a b *}, Youyu Lu ^a, Shaoyan Zhu ^b, Funian Han ^a, Guanghua Wen ^a *, Ping Tang ^a, Zibing Hou ^a

a College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China
b Guizhou Academy of Testing and Analysis, Guizhou Academy of Sciences, Guiyang, 550014, Chin

10.1016/j.partic.2023.06.017

Volume 85, February 2024, Pages 280-295

Received 21 March 2023, Revised 11 June 2023, Accepted 26 June 2023, Available online 13 July 2023, Version of Record 26 July 2023.

E-mail: zhangfei@gzata.cn; wengh@cqu.edu.cn

Highlights

• The formation mechanism of the droplet-to-granule was described.

• The mathematical model of spray drying was constructed.

• A numerical simulation method for spray drying was established.

• The granule's moisture content and diameter distribution were computed.

• The optimum spray drying parameters were determined and applied.

Abstract

In this work, the formation mechanism of the droplet-to-granule was investigated in detail based on mold powder manufacturing. A specific mathematical model of two-stage spray drying was established to describe droplet and granule motion, heat and mass transfer, and granule morphology during spray drying. Then, the relationships between spray drying parameters (inlet temperature, atomization pressure, slurry mass flow rate) and the properties of the drying tower (temperature and velocity fields) and mold powder granules (temperature, evaporation rates, moisture content, and diameter) were simulated and calculated using ANSYS/Fluent software. To ensure that the granule size of mold powder was controlled within the ideal range (0.2–0.6 mm) for producing granules with appropriate mechanical and metallurgical properties, the following optimum spray drying parameters were chosen based on the results of the numerical simulation: inlet temperatures, 873 K; slurry atomization pressure, 1.8 MPa; slurry mass flow rate, 0.05 kg s⁻¹. Among these parameters, the slurry mass flow rate has the most significant effect on granule size.

Graphical abstract

Keywords

Mold powder slurry; Spray drying parameters; Mathematical model; Numerical simulation; Granule sizes

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