Drying profiles

Fig. 9. Drying profiles for single drops of whole milk at 94°C and 0.6 m/s relative air flow. The initial diameter of drop A = 1900/mi, initial moisture content = 2.6 kg/kg, dry basis drop B = 1470 /mi initial diameter and 2.4 kg/kg moisture.

Fig. 10. Free2e drying profiles for A, whole milk, and B, nonfat milk. Heat was transmitted by radiation from heated wires above the fro2en milk which rested in a transparent plastic tray. (-----------------------) is the induction period. Total pressure was 33 Pa (0.25 mm Hg).

Fig. 3.4.8 One-dimensional SPI drying profiles drying are indicated by the symbols ( ) and of concrete moist-cured for 28 days and of a (O), respectively. The measurement para-0.6 water-cement ratio [9]. The specimen was meters were field of view (FOV) 150 mm, sealed except for one face and exposed to a acquisition points 64, tp = (55 - 300 ps, 8 val-drying regime at 38 °C and 40% relative humi- ues), a = 6°, TR = 100 ms, acquisition time dity for 28 days. The spatial moisture content 3.5 min per encoding time, after 28 days of moist curing and 28 days of...

The measurement applications of density weighted drying profiles, water ingress, water phase transitions, crack detection, chlorine, sodium and lithium imaging applied to cement-based materials can be easily translated to other porous media. Density weighted MRI will no doubt prove to be a powerful tool in material science research. 

In many, if not most of all pharmaceutical drying operations, the drying profiles are or may appear to be in the falling rate period. i.e., corresponding to segment C-D in (Figure 2A). In this case the slope k (Fig. 2B) is linear in W, so that the drying equation will be of the type In W = In Wq - ku where Wq is the moisture content at the critical point. 

Fig. 10.1.3 [Kop3] Moisture transport in cylindrical catalyst support pellets from alumina with a diameter of 3.5 mm. (a) Drying profiles of water along the diameter of an initially wet piellet. Dotted lines Experimentally detected profiles. Solid lines simulated profiles. The first profile was acquired when the dry gas flow was turned on. The delay between the detection of the successive profiles is 60s. Profiles 1-7,9, 11,14, and 18 are shown, (b) Experimental profiles for water vapour sorption by an initially dry pellet containing CaC with uniform salt distribution.

Irrigation increased the amount of rechange water, if not adding to recharge on the day of irrigation, than at the next rainfall, when the rain encountered a wet rather than a dry profile. Irrigation also tended to move aldicarb lower in the profile. 

Figure 2 Isothermal drying profiles of Ficoll glass film of 0.08-mm thickness, where F is defined as the fractional extent of drying, the mass of water removed at time t, divided by the initial water content. Thus F = 1 corresponds to the initial water content, 8.87% in this case. Redrawn, with alterations, from ref. 119...

As a result, the mill changed the drying profile to give cooler earlier dryers and slow gradient to hot dryers which then achieved more efficient sizing. 

Slow cure with synthetic sizes is the same for both ASA and AKD (and all other synthetics). It can normally be related to the drying profile and the moisture of the paper or board. The paper or board has to reach a certain moisture content and temperature before the size particles will break and align/react. If they do not reach the values they will not give the true sizing effect. 

However, with ASA, it also experienced a cure down effect that was unexpected. To remedy this it improved the drying profile and was able to run at a lower residual moisture content on machine, prior to using water calenders, to increase the moisture to customer specification. 

Impregnation technique, (liquid) volumes, number of impregnation steps and drying profiles. 

FIGURE 44.2 Drying profiles of different sludge types. 

FIGURE 55.15 Time-evolution of the average moisture content for various drying profiles. (Adapted from Chou, S.K. et al., Trans. Inst. Chem. Eng., 78(C), 193, 2000. With permission.)... 

Figure 7 Primary drying profile for a biological reference material prepared at NIBSC.

Figure 9 Freeze-drying profile showing product probe signal response due to the occurrence of ice nucleation compared to shelf temperature.

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