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Flow behavior of clusters in a riser simulated by direct simulation Monte Carlo method [An article from: Chemical Engineering Journal]
Book Details
PublisherElsevier
ISBN / ASINB000RR4MU0
ISBN-13978B000RR4MU0
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Chemical Engineering Journal, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
A discrete particle motion-collision decoupled model has been developed based on gas molecular dynamics and gas-solid two-phase fluid dynamics. Particle collision is modeled by means of the direct simulation Monte Carlo (DSMC) method. The Newtonian equations of motion are solved for each simulated particle in the system. The interaction between gas phase and simulated particle is determined by means of Newtonian third law. The flow behavior of gas and particles phases were numerically simulated in a circulating fluidized bed. The distributions of gas and particle velocity and particle concentration in the risers were analyzed. The duration time, averaged solid concentration in cluster, the ratio of total cluster duration time to total observation time and the cluster frequency were obtained in the circulating fluidized bed. The simulated results are in agreement with experimental measurements by Manyele et al. [S.V. Manyele, J.H. Parssinen, J.X. Zhu, Characterizing particle aggregates in a high-density and high-flux CFB riser, Chem. Eng. J. 88 (2002) 151-161] and Sharma et al. [A.K. Sharma, K. Tuzla, J. Matsen, J.C. Chen, Parametric effects of particle size and gas velocity on cluster characteristics in fast fluidized beds, Powder Technol. 111 (2000) 114-122] in the circulating fluidized beds. The wavelet multi-resolution analysis was used to analyze the simulated data of instantaneous particle concentration. From the random-like particle concentration fluctuations, the cluster frequency can be extracted based on the wavelet multi-resolution analysis over a time-frequency plane.
Description:
A discrete particle motion-collision decoupled model has been developed based on gas molecular dynamics and gas-solid two-phase fluid dynamics. Particle collision is modeled by means of the direct simulation Monte Carlo (DSMC) method. The Newtonian equations of motion are solved for each simulated particle in the system. The interaction between gas phase and simulated particle is determined by means of Newtonian third law. The flow behavior of gas and particles phases were numerically simulated in a circulating fluidized bed. The distributions of gas and particle velocity and particle concentration in the risers were analyzed. The duration time, averaged solid concentration in cluster, the ratio of total cluster duration time to total observation time and the cluster frequency were obtained in the circulating fluidized bed. The simulated results are in agreement with experimental measurements by Manyele et al. [S.V. Manyele, J.H. Parssinen, J.X. Zhu, Characterizing particle aggregates in a high-density and high-flux CFB riser, Chem. Eng. J. 88 (2002) 151-161] and Sharma et al. [A.K. Sharma, K. Tuzla, J. Matsen, J.C. Chen, Parametric effects of particle size and gas velocity on cluster characteristics in fast fluidized beds, Powder Technol. 111 (2000) 114-122] in the circulating fluidized beds. The wavelet multi-resolution analysis was used to analyze the simulated data of instantaneous particle concentration. From the random-like particle concentration fluctuations, the cluster frequency can be extracted based on the wavelet multi-resolution analysis over a time-frequency plane.
