Analysis of Pressure Fluctuation Signals of Two-Dimensional Spouted Beds

• Main Authors: Ming-Ching Chang, 張明欽
• Other Authors: 呂理平
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/12048421168446318731

碩士 === 國立臺灣大學 === 化學工程學研究所 === 92 === There are two spouted beds used in this study: two dimensional spouted bed and three dimensional one. They both consist of conical base with 60�a contact angle. The two dimensional spouted bed consists of a transparent plexiglas rectangular column of 1000mm height above the cone. The particles used are glass bead with average diameter of 0.785mm, 1.7mm respectively. And the three dimensional spouted bed consists of a transparent plexiglas circular column of 500mm height above the cone. The pressure taps are put below the bed, half of the conical section and 2.5, 5, 7.5cm height of the bed column. Three depths are measured: wall, center and 1/4 length of bed column. The effects of different inlet tubes, particle sizes and bed heights on the minimum spouting velocity and transition of regime, were studied with standard deviations and pressure drop. And analyzed these data with Fourier transform. The results showed that standard deviations of pressure drop not only exactly described the transition of regime but also determine minimum spouting velocity. Minimum spouting velocity increased with increasing bed height, and particle diameter. After transforming these data with Fourier transform analysis, the major frequency was changed with the variation of hydrodynamics.