• 作者： Wang, Rong-Chi; Han, Yuh-Chyn
• 中文摘要： 氣體由噴嘴進入內徑0.188米之氣固相流體化床中，使用Geldart B類粒子，利用皮托管測其垂直速度分布。實驗參數包括粒子大小、靜止床高、噴嘴囗徑、噴嘴出囗速度、格柵空床氣速以及噴嘴出囗位置等。測量氣體距離噴嘴出囗11毫米、41毫米及66毫米處之軸向及不同徑向位置上之垂直速度分布。由紊流噴氣在一均勻介質內所得Schlichting之解和噴氣徑向速度分布之實驗結果近似；並且提出噴氣軸向速度分佈之相關式如下：U/sub m//U/sub j/=16. 91D/sub o//sup -0.231/U/sub j//sup -0.483/X/sup -0.258/D/sbu p//sup -0.253/。同畤，以400毫米*35毫米之二維床體覾察噴氣現象受到操作條件之影響。在二維床體內粒子擾動之程度會隨格柵空床氣速增加而增加，而且增加粒子大小和減少格柵空床氣速會增強噴氣之穩定性。
• 英文摘要： The gas velocity profiles of vertically artificial jet dispersion within a 0.188 m I.D. gas-solid fluidized bed were experimentally studied with a pitot tube for Geldart-group B particles. Experimental parameters investigated included particle sizes, static bed height, nozzle diameter, nozzle exit velocity, grid superficial velocity, and jet location above the jet nozzle inlet. The axial jet velocities were measured at 11, 41, and 66 mm above the jet nozzle. Universal velocity profiles were applied to fit the experimental data of the decay of jet dispersion with radial distribution, and gas velocity on the jet axis was correlated to the system variables as: U/sub m//U/sub j/=l6.9lD/sub o//sup -0.231/U/sbu j//sup -0.483/X/sup-0.258/D/sub p//sup -0.253/. Also, a 400mm *35mm 2-D bed was used to observe the jet behavior that was significantly different depending on the operating conditions in the bed. The degree of particle turbulence in 2-D bed was larger at high grid superficial velocity, and the stability of jet was enhanced with increasing particle sizes and decreasing grid superficial velocity.
• 中文關鍵字： 動量散逸; 噴氣分散; 氣固相流體化床; 速度分布; 無因次速度
• 英文關鍵字： Momentum Dissipation; Jet Dispersion; Gas Solid Fluidized Bed; Velocity Distribution; Dimensionless Velocity