Fluidization Sauter mean diameter

In fluidization, the most common particle size distribution is the surface mean diameter. It is known as the Sauter mean diameter (dsv) and represents the diameter of a sphere that has the same surface-to-volume ratio as the actual particle ... 

On the macroscale, the one-dimensional PBM is used for calculation of the time-dependent PSD and for description of the corresponding particle growth in the apparatus. According to the results obtained from the macroscale and other process parameters micro- and mesoscales are generated. Following parameters are transferred from macroscale to the microscale fluidization and atomization gas properties (flow, temperature), Sauter mean diameter of PSD and bed mass. 

Most powders used in industrial fluidized beds consist of multisize particles with a wide size distribution. To calculate the minimum fluidization velocity, one should use the Sauter mean particle diameter [21]. Ideally, one should use the size distribution of the actual bed solids which can be quite different from the solids fed to the bed. 

The bed voidage at minimum fluidization conditions is the average value of the fraction of the bed volume occupied by gas at minimum fluidization conditions. Three different techniques are available to measure the bed voidage at minimum fluidization conditions. The first technique uses the experimental value of the minimuon fluidization velocity. It also requires knowledge of the fluidizing fluid properties, the particle apparent density, the Sauter mean particle diameter and the particle shape factor. The... 

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