Numerical Simulation of Particle Motion and Deposition in Spray Pyrolysis Reactors

• Main Authors: Kun-Tsung LU, 呂坤宗
• Other Authors: Yu-Chen Chang
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/90066755861643827112

碩士 === 元智大學 === 化學工程研究所 === 89 === A numerical investigation to evaluate the effectiveness of the use of clean sheath flow to suppress thermophoretic losses is presented here. Commercially available computational fluid dynamics(CFD) software Fluent accompanied with the Gambit software for mesh construction was used in make up Spray Pyrolysis reactor model. The Reynolds number of reactor for drying section and sheath flow is about 150~300.Free convection, forced convection, thermophoresis, and Brownian diffusion were included in Spray Pyrolysis reactor model. Merging flow distributions and deposition mechanism will be validated with previous investigation in literature. The simulated results is in reasonably good agreement with those obtained in experiments (Chang and Cheng 1999).For cases with sheath flow with and without being heated to a higher temperature, the simulated results are in excellent agreement with experimental results, indicating excellent prediction from the numerical model and confirming the effectiveness of using a clean sheath flow to suppress particle deposition. The numerical results of variable ratio (Ds/Da) could assist designed Spray Pyrolysis reactor .