Comparative study of droplet drying models for CFD modelling |
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Authors: | Meng Wai Woo Wan Ramli Wan Daud Arun S. Mujumdar Meor Zainal Meor Talib Wu Zhong Hua Siti Masrinda Tasirin |
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Affiliation: | aDepartment of Chemical & Processing Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor DE, Malaysia;bMechanical Engineering Department, National University of Singapore, Kent Ridge Crescent, Singapore |
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Abstract: | CFD simulation is used to study wall deposition and agglomeration phenomena commonly encountered in industrial spray dryers. This paper initially provides a comparison of two drying kinetics models: Characteristic Drying Curve (CDC) and Reaction Engineering Approach (REA). Comparisons are made with experimental data with application to carbohydrate droplet drying obtained from past workers. These models were then extrapolated to actual drying conditions to assess their performance. The REA model predicts the progressive reduction in drying rate better than the CDC model for the carbohydrate droplets. A modified CDC model incorporating a convex falling rate produced better agreement than the conventional linear falling rate model. Further analysis showed that the REA model can be extended to simulate the particle surface moisture which may affect the agglomeration process. The proposed concept was compared with reported simulation results from a diffusion model which showed reasonable fit with data. |
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Keywords: | Spray drying Single droplet drying CFD sub-model |
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