Dissertation > Excellent graduate degree dissertation topics show

Study of Two-Phase Flow Characteristics in a SMTD Dryer

Author: ShuiYinJie
Tutor: SunQin
School: Zhejiang University of Technology
Course: Chemical Engineering
Keywords: SMTD dryer numerical simulation gas-solid flow RSM model
CLC: TQ021
Type: Master's thesis
Year: 2011
Downloads: 38
Quote: 0
Read: Download Dissertation

Abstract


The study of SMTD(swirl medium time dryer)is extremely difficult for its complicated interior flow field as well as lacking theoretical and experimental researches. In this paper, the SMTD dryer was preliminarily studied by computer simulation.The velocity field of gas-solid flow in SMTD dryer was simulated by the method of computational fluid dynamics (CFD). And the single-phase flow field, gas-solid flow field, particle volume fraction, particle motion track, pressure drop, temperature field and moisture distribution were investigated in this paper.The gas flow field was simulated by the use of three models: thek ?εstandard model, RNG model and Reynolds stress model (RSM model). The results show that the RSM model is more suitable, so in this paper, the gas-solid flow was coupling calculated by using the RSM model.The distributional characteristics of the three- dimensional component velocity of axial direction, radial direction, and tangential direction of the velocity field in the SMTD dryer were obtained by the simulation. The result indicates that tangential velocity is the main velocity among the three as it’s much larger than the others. Then the characteristic of the distribution of pressure and relationship between pressure and gas velocity were further analyzed.Euler coordinate RSM model was used for the gas simulation. The particles were calculated respectively using mixture model under Euler coordinate and stochastic model under Lagrange coordinate. At the same time the interaction of two phases was considered. The distribution of solid particles was obtained by Euler model. The result shows that the volume fraction of solid particles reaches the highest value on the wall and increases with the increasing radial distance. The particle trajectories were presented by the Stochastic model. The result indicates the movement of particles in the dryer is randomness. The gas temperature falls with the increase of dryer height while water vapor concentration increases with the increase of dryer height. Near the wall,water vapor concentration is higher.In order to get a better understanding of the flow characteristics of SMTD dryer, the particles residence time in the dryer was researched. The results of simulation agree very well to experiment data, which proves the correctness of simulation and can make contribution to further design and theoretical research of SMTD dryer.

Related Dissertations

  1. The Setting Bases of Working Pressure in LNG Systems and Orthogonal Experiment Design of Heat Exchangers,TQ051.5
  2. Study on Springback of High-Strength Steel Stamping,TG386
  3. Numerical Simulation and Experiment on Hydroforming of Cups with Controllable Radial Pressure,TG386
  4. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  5. Numerical Simulation of Film Cooling in Turbine Cascade with Non-Axisymmetric Endwall Method,V231.3
  6. High Speed Aerodynamic Convection and Coupled Heat Transfer of Complicated Bodies,V215.4
  7. The Analysis on Characteris of Vibration Source about Vertical Vibration of Surrounding Environment Induced by Rail Transit,U211.3
  8. Study on the Heat Transfer Characteristics of Particle Cluster in Circulating Fluidized Bed,TK124
  9. Numerical Simulation of SNCR Process of a 600MW Utility Boiler,TK222
  10. Numerical Simulation of Biomass Direct Reburning,TK16
  11. Numerical Simulation on Pulverized Coal Combustion Process in a 670T/H Tangential Firing Furnace,TK224.11
  12. Numerical Simulation on the Combustion Process in the Furnace of a 1000MW Lignite-Fired USC Boiler,TK224.11
  13. Study on Gas-Solid Two-Phase Flow in Spouted Beds,TK173
  14. Experimental Study and Numerical Simulation on Aerodynamic Field of Tangential Bias Swirl Burner,TK223.23
  15. Characteristic Study of Combustion in Central Reverse Flame Chamber,TK223.21
  16. Numerical Simulation and Contrastive Analysis of Labyrinth Seals and Leaf Seals,TK263.2
  17. Numerical Study on Phosphorus Distribution in Water Environment of the Three Gorges Reservoir,X832
  18. The Design and Performance Simulation of External Valve Small Displacement Pump,TE933.3
  19. Analysis of the Impact of Tailings Dam Stability under Seepage Role,TV649
  20. Study on Hydraulic Fracturing of Low Permeability Reservoir,P618.13
  21. Numerical Simulation and Experimental Study of Air-Assisted Sprayer of Orchard,S491

CLC: > Industrial Technology > Chemical Industry > General issues > Chemical processes ( physical processes and physical and chemical processes ) > Basic theory
© 2012 www.DissertationTopic.Net  Mobile