Group diameter

Dendrimer generation Molecular weight Primary amino surface groups Diameter (A)... 

Modifier molecules were approximated by disks with a diameter d. The value was taken to be equal to the anchor organosilicon group diameter ... 

The selectivity of a collector can also be influenced by steric factors which include mainly group diameter d ) and the van der Waals volume of the collector. 

Calculation of group diameter, dg. the cross-sectional width (group diameter) of a polar group of a collector can be calculated using the data for bond angle, covalent radius and the van der Walls radius of the compound. 

Group diameter and selectivity of the collector flotation studies show that the selectivity of a collector is closely related to its group diameter. 

Polystyrene is the most frequently used polymeric support for the immobiUzation of paUadium complexes [15]. The PS resins are weU developed in the field of soUd-phase peptide synthesis. Therefore resins bearing various chemical functional groups, diameter size, loading value, degree of cross-linking, for example, are now commerciaUy readily avaUable to permit investigation of these variables on the catalytic property. The most widely used polystyrene in... 

Bubbles can grow to on the order of a meter in diameter in Group B powders in large beds. The maximum stable bubble size is limited by the size of the vessel or the stabiUty of the bubble itself. In large fluidized beds, the limit to bubble growth occurs when the roof of the bubble becomes unstable and the bubble spHts. EmpidcaHy, it has been found that the maximum stable bubble size may be calculated for Group A particles from... 

This equation predicts that the height of a theoretical diffusion stage increases, ie, mass-transfer resistance increases, both with bed height and bed diameter. The diffusion resistance for Group B particles where the maximum stable bubble size and the bed height are critical parameters may also be calculated (21). 

A typical catalyst bed is very shallow (10 to 50 mm) (76,77). In some plants the catalyst is contained in numerous small parallel reactors in others, catalyst-bed diameters up to 1.7 and 2.0 m (77,80) and capacities of up to 135,000 t/yr per reactor are reported (78). The silver catalyst has a useful life of three to eight months and can be recovered. It is easily poisoned by traces of transition group metals and by sulfur. 

Reynolds Number. The Reynolds number, Ke, is named after Osborne Reynolds, who studied the flow of fluids, and in particular the transition from laminar to turbulent flow conditions. This transition was found to depend on flow velocity, viscosity, density, tube diameter, and tube length. Using a nondimensional group, defined as p NDJp, the transition from laminar to turbulent flow for any internal flow takes place at a value of approximately 2100. Hence, the dimensionless Reynolds number is commonly used to describe whether a flow is laminar or turbulent. Thus... 

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