การจำลองแบบฟลูอิดไดซ์เบดแบบสั่นในสามมิติ โดยวิธีการวิเคราะห์อนุภาคแบบไม่ต่อเนื่อง

Name: ชัยชาญ แสงจันทร์นุกูล

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Three-Dimensional

; Vibrated Fluidized Bed

; Distinct Element Method (DEM)

Abstract: In this research, the gas-solid flow in fluidized bed and vibrated fluidized bed weremodeled. The particle and fluid motions were modeled in three-dimensional in whichthe effect of front and rear walls were taken into account. The particle motion wasmodeled by solving the Newton's second law of motion in which the inter-particleforces were modeled by Distinct Element Method (DEM). The fluid motion and heattransfer were obtained by applying the Computational Fluid Dynamics (CFD) to solvetransport equations in which all the quantities were averaged over the control volume.SIMPLE method with Upwind scheme were used to solve the momentum equations. Insimulation of heat transfer between fluid and particles, Ranz-Marshall correlation(1952) was applied to calculate the heat transfer coefficient. In the simulation 3,300particles (diameter = 4.0 mm, density= 2,700 kg/m3, stiffness = 800.0 N/m) werzsimulated in a rectangular bed of size 90x400x21mm. The time step used to keep thesimulation stable was between 3x10?????-5 and 6.5x10?????-5sec.The developed program was used to study the effect of superficial gas velocity (Uo) andvibration intensity in fluidized bed. Superficial gas velocities used in this study werebetween 3.0 and 6.0 m/s. The vibration intensities used in this study were 0.8 and 5.0.The results were animated with MAT LAB^^ in which the snapshots for each case werediscussed. At low velocities, before minimum fluidization velocity, particles behavedlike packed bed and no particle circulations were observed, hence heat transfer occurredonly near the orifice. Increasing in Uo until the point that the bed start to fluidize(minimum fluidization velocity), they were found equal to 5.2 m/s for stationaryfluidized bed and 4.6 m/s for two vibrated fluidized beds. This indicated that vibratedfluidized bed could be operated at lower Uo than stationary fluidized bed but nodifference between two intensities was clearly seen in this study. At velocity higher thanthe minimum fluidization velocity, bubble was formed at the center and erupted at thesurface that caused circulation motion of the particles. For both stationary and vibratedbed, heat transfer within the bed (represented by the averaged particle temperature)increase with Uo and reach the maximum at the minimum fluidization velocity. Atvelocity higher than this point, increasing in Uo could not significantly improve heat transfer.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: Assoc.Prof. Thongchai Srinophakun

Role: Supervisor

Created: 2545

Issued: 2005-11-08

Modified: 2006-05-10

วิทยานิพนธ์/Thesis

ISBN: 9744561815

CallNumber: CHE1379

tha

DegreeName: วิศวกรรมศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: วิศวกรรมเคมี

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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