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題 名 | Measurements of the Particle Velocity and Flow Pattern of Particles in Magnetically Fluidized Beds=磁流體化床中粒子之速度與運動情況 |
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作 者 | 林永忠; 呂理平; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 36:5 民94.09 |
頁 次 | 頁497-509 |
分類號 | 460.02 |
關鍵詞 | 磁流體化床; 粒子; Fluidized beds; Magnetically fluidized beds; Particle velocity; Optical fiber probe; |
語 文 | 英文(English) |
中文摘要 | 本研究利用230μm之鐵粒子探討在磁流體化床中之粒子速度與粒子在床中之運動情況。磁流體化床中之均勻磁場利用直流電通過五個線圈產生。光纖探討被設計用來量測鐵粒子在磁流體化床中不同之位置,不同氣體表面速度與不同之磁場強度下之速度。 實驗結果顯示在磁穩流體化床(MSFB)中之粒子速度為零。在磁氣泡流體化床(MBFB)中粒子速度隨磁場強度之增加而減少;隨床中徑向距離之增加而減少;隨床中氣體表面速度之減少而減少;以及隨床中距離增加而增加。粒子之速度與方向可以利用以下公式計算:Vp=Lef/(tr2+tz2)1/2,Θ=tan-1(tz/tr)。而軸向經過時間t1可以下式表示:1/tz=1/tzc-)1/tzc-1/tzw)(r/R)B。其中tzc,tzw,B皆與床中氣體表面速度磁場強度以及隨床中距離分配板之距離有關,並且皆可以用下式表示A1(z/hs)A2(Us/Umf)A3{exp[A4(z/hs)+A5(Us/Umf)]}H46實驗結果與模擬計算結果非常相近。 |
英文摘要 | The particle velocity and flow pattern of particles in fluidized beds of iron particles (230μm) were investigated under the influence of an external uniform axial magnetic field. A uniform magnetic field was generated by passing a direct current through five solenoids. A sensitive optical measuring system, based on the detection of light reflected by particles, was used to measured the particle velocity in the dense phase. The particle velocity was measured as a function of the superficial fluidizing air velocity, magnetic field intensity and position in the bed. The experimental results revealed that the particle velocity was zero in a magnetically stabilized fluidized bed (MSFB). The particle velocity in a magnetized bubbling fluidized bed (MBFB) decreased as the magnetic field intensity and radial distance from the axis of bed column increased, and as the superficial gas velocity, and axial distance from the distributor decreased. The magnitude and direction of the particle velocity were calculated by using the equation: Vp=Lef /(tr2+trz)1/2 and Θ=tan-1(tz/tr). The following general correlation was developed to predict the axial transit time (tz): 1/tz-(1/tx-1/tzw)(r/R)B, where tx and tzw represent the axial transit time at the bed center and at the bed wall, respectively, and B is a parameter. All were functions of the air velocity, the distance from the distributor and the magnetic field intensity, and all had similar forms as follows: A1(z/hs)A2(Us/Umf)A3{exp[A4(z/hs)+A5(Us/Umf)]}HA6. Results obtained in time –averaged particle velocity experiments were close to those obtained through simulation. |
本系統中英文摘要資訊取自各篇刊載內容。