The Study of the Existence of Transition Velocity and the Hydrodynamics of Turbulent Fluidized Beds
Date Issued
2004
Date
2004
Author(s)
Shou, Ming-chang
DOI
zh-TW
Abstract
Abstract
The transition from bubbling bed to fast fluidization bed will be investigated by using (1) optical fiber to measure the local bed voidage distribution, (2) pressure probe to measure the pressure fluctuations and (3) heat transfer probe to measure the bed-to-wall heat transfer coefficient. This transition region from bubbling bed to fast fluidized bed is now widely referred to the turbulent fluidized bed, the structure of this bed and the mechanism for the transition are still unclear.
Experimental study will be carried out in a 0.108 m i.d., 5.76m high with expanded-top fluidized bed, and other type of bed. Several different sizes of Group A and B particles will be used as the fluidized particles. The local bed voidage will be measured by reflection type optical fiber probe. With the addition of mean amplitude of pressure fluctuations and bed-to-wall heat transfer coefficient measurements, hopefully the transition mechanism and the bed structure could be understood in more detailed way, and the existence of “turbulent fluidized bed” could be explained in a logical sense. Above all, by wavelet analysis, the existence of transition velocity could be identified and the hydrodynamics of turbulent fluidized bed could be characterized.
Subjects
壓力探針
光纖探針
小波
移轉速度
熱傳探針
optical fiber
transition velocity
pressure probe
heater probe
wavelet
Type
thesis
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