Author : Suresh P Singh, Satyendra S Tomar and Krishna Kant K Singh

Studies in the expansion behavior of fluidized bed systems are important for specifying the height of the fluidized bed. The bed expansion takes place because of bubbles any excess gas passes in the form of bubbles. The expansion of a fluidized bed usually commences when it is beyond minimum fluidization velocity. The bubble hold up is responsible for the expansion of the fluidized bed. Therefore, the excess air (U-Umf) is responsible for bed expansion. Other variables that may affect bed expansion are particles and fluid characteristics. Data have been obtained on the heights of fluidized bed for Air-salt, Air-Magnesite, Air-Ammonium Sulphate and Air-Sand system using different static bed height. In this paper a correlation has been established to predict directly the expanded bed heights as a function of particles Reduced Reynolds Numbers as well as fluid characteristics. It has been seen that the calculated values by correlation agree well with the experimental values.

Keywords: Fluidized bed; minimum fluidization velocity; Reduced Reynolds Numbers.

Article published in International Journal of Current  Engineering  and Technology, Vol.3,No.2 (June- 2013)