Vessel geometry

For the set vessel geometry and approximate impeller diameter, impeller speed is then calculated to satisfy process requirements. For process requirements as stated as a tip speed, impeller speed is given by the following relationship ... 

The two types of vessel geometries employed are vertieal and horizontal. In most of the fine ehemieals proeesses the leaves are fitted into vertieal vessels whereas horizontal vessels are used in the heavier process industries sueh as the preparation of sulfur in phosphoric acid plants. The leaves inside horizontal tanks may be positioned either along the tank axis or perpendieular to the axis. In order to utilize the tank volume for maximum filtration area the width of the leaves is graduated so they fit to the eireular eontour of the tank. 

Anchor to wall clearance of 1 to 5.125 in. Vessel geometry is illustrated by Holland and Chapman [4]... 

The convenience of Eq. (6) is realizable only in the rather unrealistic situation where the charge distribution exhibits cylindrical or spherical symmetry. For storage silos, blenders, fluidized bed reactors, and other real vessel geometries, integral solutions are usually not possible, necessitating an alternate problem formulation. Poisson s equation serves this need, relating the volume charge distribution to the electrostatic potential. 

The surface area A is the area of the vessel wetted by its internal liquid with a height less than 25 ft above the flame source. Wong24 provided considerably more detail on how to determine this and provided a number of equations for various vessel geometries. 

The (L/D)opt ratio is significantly different from the rule of thumb stated earlier in the example, namely, LID = 3 this difference must be due to the assumptions (perhaps erroneous) regarding vessel geometry and fabrication costs. 

This is a fruitful approach, and much of what follows concerns the development and use of such flow models. The parameters of these models are correlatable with physical properties of the fluid, vessel geometry, and flow rate once such correlations are found for all types of fluid processing, performance predictions can be obtained without resort to experimentation. 

Above the critical agitator speed, the active volume rises linearly to unity with r.p.m. This rate of rise is a function of impeller blade size (hence energy input) but is independent of feed location (or vessel geometry). 

The parameter S is called the proportionality constant or shape factor, and depends on the impeller and vessel geometry (Armenante and Nagamine, 1998) ... 

Although pneumatic mixers may differ from one another in vessel geometry, air nozzle type, and air nozzle configuration, no pneumatic mixer subclasses have been identified. 

The zinc salt and BaS solutions are mixed thoroughly under controlled conditions (vessel geometry, temperature, pH, salt concentration, and stirring speed, see (a) in Fig. 20). The precipitated raw lithopone does not possess pigment properties. It is filtered off (b2) and dried (c) ca. 2 cm lumps of the material are calcined in a rotary kiln (d) directly heated with natural gas at 650-700 °C. Crystal growth is controlled by adding 1-2 wt% NaCl, 2 wt % Na2S04 and traces of Mg2 + (ca. 2000 ppm), and K+ (ca. 100-200 ppm). The temperature profile and residence time in the kiln are controlled to obtain ZnS with an optimum particle size of ca. 300 nm. 

In the first paper. "The How and Why of Emulsions" by Banshach. the factors that cause emulsions and make them stable arc explained. The use of demulsifiers is discussed, and the need for agitation, heat, and electricity for coalescers and proper vessel geometry for settling i> explained. The final section presents comments for troubleshooting systems and equipment. 

Blickensderfer et al. (119) have recently extended the Samson theory to include various vessel geometries under conditions of pure Doppler, pure Lorentz, and Voigt (a combination of Doppler, Lorentz, and natural broadening) line profiles. The quenching cross section can be obtained also by a dynamic method in which the decay of the fluorescence intensity is measured after the exciting light is cut off. If the initial fluorescence intensity is / and the intensity after a lime f is If, we obtain... 

Andersson, T., T. Pihtsalmi, K. Hartonen, T. Hyotylainem, and M.L. Riekkola. 2003. Effect of extraction vessel geometry and flow homogeneity on recoveries of polycyclic aromatic hydrocarbons in pressurised hot water extraction. Anal. Bioanal. Chem. 376 1081-1088. 

---