Simulation on fluid flow behaviour in a rotor - stator spinning disk reactor

• Main Authors: Jing-Wei Chang, 張靖偉
• Other Authors: Yu-Shao Chen
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/9b7y79

碩士 === 中原大學 === 化學工程研究所 === 106 === Rotor-stator spinning disc reactor (RS-SDR) is a novel equipment which has high heat and mass transfer efficiency for process intensification. In this study, the characteristics of hydrodynamics of the device were investigated by simulation. A commercial Computational Fluid Dynamics (CFD) software, Fluent 14.0, was used in the simulation. The simulation results were compared with the experimental results in references to confirm the reliability of the CFD model. The influences of the rotor-stator distance, the rotational speed, and liquid flow rate were investigated. The results showed that both the radial and the circumferential velocities increased with increasing the rotational speed and the liquid flow rate. Likewise, the pressure drop increased as the liquid flow rate and the rotational speed increased. Next, the influence of the rotational speed, the liquid flow rate, the gas flow rate, and the size of cavity zone were investigated in the two-phase flow system. According to the result, two types of liquid flow, i.e., slug flow and film flow, were found in the upper channel of the RS-SDR. Because of high centrifugal force, the accumulation of gas can be reduced in the cavity zone and small gas bubbles size were generated between the rotor and the bottom stator. Besides, the simulation results of the flow behavior of liquid and the pressure drop were compared with the experimental results in references under the same operating conditions. Even though the simulated pressure drop is higher than that in reference, the trends of the simulated pressure drop and velocity distribution were similar to the experimental ones. Finally, several designs of RS-SDR were tested. The results showed that the accumulation of gas in cavity zone can be effectively decreased by using perforated disc which contributes to easily forming small gas bubbles in the bottom channel. According to the experimental results, the optimization design of the RS-SDR is capable of being investigated in the future work.