An experimental study on heat transfer in liquid-solid packed fluidization

Conference Dates

May 22-27, 2016


Gas-solid fluidized beds are widely used in various process and allied industries for their inherent advantage of high rates of heat and mass transfer and quickly achievable isothermal condition inside bed. This conventional gas-solid fluidized bed may be referred as unary fluidized bed, because the particles used in such fluidized beds are generally within close size range. There are another type of fluidized bed used in case of some typical applications, in which small particles are allowed to fluidize in the interstitial void of relatively large and stationary bed of pebbles, called packing. This type of fluidized beds is called binary packed fluidized Bed [1-3].

Heat transfers in gas-solid unary fluidized bed was well studied and are reported in literature, but till date few studies were conducted and reported in literature on the heat transfer in gas-solid packed fluidized bed [4, 5]. Mandal et al, studied the hydrodynamic behavior of gas-solid [3] as well as liquid-solid packed fluidized bed [6], but no study has been reported on the study of heat transfer in liquid–solid binary packed fluidized bed. It was found that the rate of heat transfer in gas-solid packed fluidized enhances many folds compared to that of packed bed under similar operating conditions [4, 5] and a correlation (Eq. (1)) has been developed to determine the effective thermal conductivity of packed fluidized bed (). In Eq.(1) and are thermal conductivity of solid and gas, is the void fraction of packed fluidized bed, and are size of particle and pebbles, is the volume fraction of the interstitial void volume of packed bed filled with particles and is the Peclet number of packed fluidized bed defined somewhere else. [5].

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