• 作者： Leu, Lii-Ping; Lan, Chung-Wen
• 中文摘要： 三個幾何形狀相似且比例為1:2:7之二維流體化床被選來當做研究氣,固氣泡流體化床之放大法則之工具。在相同床中以Silica/氦(2.67大氣壓)及Alumina/空氣(270.degree.C)用來探討「物性效應」; 在7/1比例之床中以砂/Freon- 12及軟木塞/空氣來探討「因次效應」。Glicksman及Horio之相似法則被利用來測試。Glicksman之法則在相似放大實驗中,得到滿意之結果; 但Horio之法則由於忽略了流體物性及粒子大小並無法得到相似之結果。壓力擾動之信號被用來比較相似實驗之結果,壓力擾動之或然率密度函數、振幅比、自我相關函數、冪次頻譜密度函數及主頻提供了靈敏之方式來區分不同之氣泡現象及流力行為。
• 英文摘要： The scaling relationships for gas-solid bubbling fluidized beds were verified. Three geometrically similar two-dimensional fluidized beds with the geometric ratio of 1:2:7 were chosen for study. The " physical property effects" study was performed in the same bed with silica/helium (2.67 atm) and alumina/air (270.degree.C); and "dimension effect" study was performed in the cold beds of sand/Freon- 12 and cork/air with the scaling ratio of 7/1. Glicksman's and Horio's criteria were tested in our system. Glicksman's criterion is successful in the similarity experiments, but Horia's criterion fails through ignoring the effects of fluid properties (temperature effect) and particle size. The pressure fluctuation signals were used to compare these similarity experiments. Probability density function, amplitude ratio, autocorrelation function, power spectral density function, and major frequency of pressure fluctuations provide sensitive methods to identify different bubble phenomena and hydrodynamics.
• 中文關鍵字： 放大; 氣泡流體化床; 壓力擾動; 相似; Glicksman; Horio
• 英文關鍵字： Scale-Up; Bubbling Fluidized Bed; Pressure Fluctuation; Similarity; Glicksman Group; Horio Group