Volumetric feed rate

The diameter of the air core varies with the feed volumetric flow rate. If the rate is too low, there is no air core and all of the pulp leaves the cyclone as underflow if the rate is too high, the air core expands, closing off the apex and forcing all of the pulp to leave the cyclone as overflow. Consequently there is a minimum and maximum volumetric feed rate. Because the pressure drop is proportional to the square of the volumetric feed rate, the minimum and maximum rates can be monitored by the pressure drop. The ratio of the maximum pressure drop to the minimum pressure drop should be less than 4, meaning the maximum to minimum volumetric feed rate should be less than 2. 

For a properly designed and operated cyclone, the sharpness iadex is constant, typically 0.6. The cut size and apparent bypass are a function of the cyclone geometry, the volumetric feed rate, the material relative density, the feed soflds concentration, and the slurry rheology. The relationship for a standard cyclone geometry, where if is the cylinder diameter ia cm and inlet area = 0.05 vortex finder diameter = 0.35 ... 

In this model of non-ideal reactor mixing, a fraction, fi, of the volumetric feed rate, F, completely by-passes the mixing in the reactor. In addition, a fraction, f2, of the reactor volume, V, exists as dead space. F3 is the volumetric rate of exchange between the perfectly mixed volume Vi and the dead zone volume V2 of the reactor. 

VR. No special constraint is to be placed on the volumetric feed rate or the initial concentration of species A. 

The volumetric feed rate may be determined from the production requirements and the density of the material. 

A first-order, liquid-phase reaction (A - products) is being carried out isothermally and in steady-state in a PFR of volume V. The volumetric feed rate is q, in consistent units, and the conversion obtained (fA) is 0.93. How many CSTRs, each of the same volume as above (V),... 

F = total volumetric feed rate/ 100 cuft of reactor... 

Sinfelt et al, J Phys Chem 64 892, 1960). Another investigation is to be made at this temperature and 6.8 atm total pressure with a reactor 1 inch in diameter and 1 ft long. The catalyst used, Pt on alumina, has a bulk density of 187.5 lb/cuft. The volumetric feed rate is to be 12.3 Std cuft/min. What conversion can be expected with feeds composed of (a) 5% n-pentane and 95% hydrogen, (b) 20% n-pentane and 80% hydrogen ... 

Volumetric feed rates of the two phases are VJ-and Vg. Material balances on A and P are... 

The volumetric feed rate per unit reactor volume is... 

Go Volumetric feed rate of suspension to continuous thickener m3/s L3T- ... 

This interesting relationship)37) enables the effect of changes in residence time to be evaluated. For example, if i = 3, a typical value for many inorganic salt systems, a doubling of the residence time would increase the dominant product crystal size by only 26 per cent. This could be achieved either by doubling the volume of the crystalliser or by halving the volumetric feed rate, and hence the production rate. Thus, residence time adjustment is usually not a very effective means of controlling product crystal size. 

The third of the six Sorbex zone parameters is the ratio of A/F , which is a unit-less value and represents the ratio of the selective pore rate (A) to the volumetric feed rate of n-paraffins (F ). This means that the ratio A/F sets the amount of selective pores that circulate countercurrent to the rate of feed normals introduced... 

Thus, the total volumetric feed rate at inlet is... 

Using Simpson s rule, the value of /o /dxA is 23.5s. At HOOK, the given molar feed rate of 0.25molAs together with the inert diluent, corresponds to a total volumetric feed rate of 0.564 m s . Thus... 

It may be more convenient to measure the volumetric feed rate at some standard state, especially when the reactor is to operate at a number of temperatures. If, for example, the material is gaseous when fed to the reactor at high temperature but is liquid at the standard state, care must be taken to specify precisely what state has been chosen. The relation between the space-velocity and space-time for actual feed conditions (unprimed symbols) and at standard conditions (designated by primes) is given by... 

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