呂理平Leu, L.P.L.P.Leu2006-07-252018-06-282006-07-252018-06-282003http://ntur.lib.ntu.edu.tw//handle/246246/9330This experiment studied with standard deviations and pressue drop. And discuss the effects of different cone angle, particle size and bed height on the minimun spouting velocity and analyzed these data with wavelet transform. The results showed that satndard deviations of pressure drop not only exactly describe the transition of regime but also determine minimun spouting velocity. We find minimun spouting vwlocity increase with bed height, cone angle and particle diameter. After wavelet transform, these data could be divided into several scales are responded to the hydrodynamic changes.本實驗量測壓降與壓力擾動標準偏差變化，觀察其與流態變化之關係，並探討不同圓錐角不同粒子，不同床高下的噴流情形，研究以上各操作變數對最小噴流化速度的影響；並用wavelet transform將原始數據轉換作分析。結果顯示，壓力擾動可以準確判斷流態變化。實驗中當床高，粒徑及圓錐角增加時，所對應的最小噴流化速度會隨之上升。又將原始數據經wavelet轉換後，依不同的頻率大小分成不同的區間，可利用其中的幾個頻率區域的擾動變化，與內部流態之改變相惢較，以準確的判斷噴流床的操作情形。application/pdf603465 bytesapplication/pdfzh-TW國立臺灣大學化學工程學系暨研究所spouted bedstandard deviations of pressure dropminimun spouting velocity噴流床；　壓力擾動標準偏差；　最小噴流化速度reporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/9330/1/912214E002015.pdf