Vessel size, effects

One of the differences between polishing and cake filtration is the space between the plates. For polishing applications the clearances are about 20 mm as opposed to cake filtration applications where, depending on the percentage of solids and cake build-up properties, clearances may reach 100 mm. Hence, polishing filters accommodate more plates than cake filters so for the same vessel size more effective area is available with polishers. 

The factors chosen were variations in vessel size, the effect of non-aseptic operation and medium recycle, and variations in recovery and drying procedures. 

Similar effects are obtained with non-cylindrical vessels although, in the absence of adequate data, it is best to use the correlations for cylinders, basing the vessel size on its hydraulic mean diameter which is four times the ratio of the cross-sectional area to the wetted perimeter. 

The vessel size and Internals need to be properly designed to enable process performance guarantees to be met under the specified notion conditions. Due to the complexity of motions and Internals there 1s no effective analytical approach and consequently proper design relies heavily on empirical methods. This requires either costly trial and error work on the actual marine vessel or motion simulation. 

Since the previously stated limitations on vessel size were still in effect, it was decided to pursue a roate using multiple adsorber beds in a highly integrated system. It was necessary to define integrated high-capacity systems with at least 80% product recovery and to devise control schemes for such systems. 

For the vascular system, Lagana et al. [261] employed a hierarchical methodology for multiscale modeling of pulmonary and coronary perfusions in the cardiovascular system. Essentially, they studied different shunt size effect on the pressure of blood within the vessels. 

Effect of Crystal Size. The effect of crystal size on the polymerization rate in radiation-induced polymerizations has been the subject of much discussion (8, 9). However, since small levels of impurities have been demonstrated to have such profound effects, it has been difficult to compare meaningful rate data obtained on large crystals in one reaction vessel with those for small crystals in another. Hexamethylcyclo-tetrasiloxane allows a unique opportunity for experimentation into this size effect since, owing to the high vapor pressure of the solid (JO), it is possible to grow large crystals from small crystals in the same tube, after purification is complete. Thus, crystals of both sizes exist in exactly the same environment. 

Environmental Effects. It has been found that the AIT becomes lower with increasing vessel size in the range of 35 ml to 12 L. An increase in pressure usually decreases AITs, and a decrease in pressure raises AITs. Usually oxygen enrichment of the air tends to decrease the minimum AIT, and a decrease in oxygen content increases the minimum AIT. Low-temperature oxidation can result in cool flames, which may grow into ignition. 

Next, consider the effect of changes in vessel size for a geometrically-similar series of vessels (recalling that in such a series the impeller type is constant). The second column of Table V shows considerable variation... 

Tests should be conducted at short cycle times (i.e., compared to those used in the plant) in the laboratory vessel. Dispersion times of 1 minute or less, on the low end, are reasonable for the laboratory vessel. But tests should be conducted over a range of dispersion times in order to determine how drop size (or drop size effects) change with dispersion time all the way up to the dispersion time required to achieve the long-term equilibrium drop size. 

Chatzi, E.G., Boutris, C.J. and Kiparissides, C. (1991). Online monitoring of drop size distributions in agitated vessels. 1. Effects of stabilizer concentration. Ind. Eng. Chem. Res., 30, 1307-13. 

---