Saturation carrying capacity

Transport Disengaging Height. When the drag and buoyancy forces exerted by the gas on a particle exceed the gravitational and interparticle forces at the surface of the bed, particles ate thrown into the freeboard. The ejected particles can be coarser and more numerous than the saturation carrying capacity of the gas, and some coarse particles and clusters of fines particles fall back into the bed. Some particles also coUect near the wall and fall back into the fluidized bed. 

The transport velocity can also be evaluated from the variations of the local pressure drop per unit length (Ap/Az) with respect to the gas velocity and the solids circulation rate, Jp. An example of such a relationship is shown in Fig. 10.4. It is seen in the figure that, along the curve AB, the solids circulation rates are lower than the saturation carrying capacity of the flow. Particles with low particle terminal velocities are carried over from the riser, while others remain at the bottom of the riser. With increasing solids circulation rate, more particles accumulate at the bottom. At point B in the curve, the solids fed into the riser are balanced by the saturated carrying capacity. A slight increase in the solids circulation rate yields a sharp increase in the pressure drop (see curve BC in Fig. 10.4). This behavior reflects the collapse of the solid particles into a dense-phase fluidized bed. When the gas... 

For solving the EMMS model, the saturation carrying capacity K has to be determined to ascertain whether Nn should be minimized or maximized in Model LG, that is, to identify the transition from the PFC regime to the FD regime. This transition is characterized by the following equality (Li et al, 1992) ... 

Fig. 4. Definition of saturation carrying capacity and transition from PFC to FD regime...

According to the preceding definition, the relationship between the saturation carrying capacity K and fluid velocity Ut can be calculated, as shown in Fig. 5, which defines the transition from the PFC regime to the FD regime, that is, from fast fluidization to dilute transport, as corroborated by the experimental points (the data at high velocities was transported from Fig. 7). 

Where it is necessary to estimate these profiles in advance or where pressure taps have not been provided, several methods are available for estimating av(z) or sav(z)- Bai and Kato (1999) provide excellent summary tables showing previous correlations and sources of data. They then provide useful new correlations based on two cases, one for net circulation fluxes, Gs, less than, and the other for them greater than, the saturation carrying capacity flux, G, correlated by... 

Because carrier systems are involved, the secretory process has a limited carrying capacity and can be saturated. Therefore, in distinction from glomerular filtration, tubular secretion is dependent upon the plasma concentration of the drug. Like all active transport processes, secretion of a drug into the tubular fluid can be competitively inhibited by other drugs that are transported by the same carrier. 

The air must have adequate capacity to carry out the moisture released from the meal without becoming saturated. Cold air can hold less moisture than warm air, so winter conditions may limit the moisture-carrying capacity of the air. If additional heat is required for increasing the dew point of the incoming air, the air entering the air dryer trays can be heated to temperatures up to 150°C. 

We assume that the population growth can be described by the logistic growth function F p) = p( - /o/Pmax) where p is the saturation density or carrying capacity. This growth function compares favorably with a wealth of experimental results [256]. Equation (7.1) leads to wavefronts with asymptotic velocity, see (5.60),... 

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