Holding efficiency

Let us illustrate this method with the three-sequence dynamic run of a Hg-Tl mixture as described in Table 1 and assume for brevity that the exponential fractionation law holds. Efficiencies are only known as relative values and we will assume that the efficiency factor of the axial cup is unity. For the best possible precision, the ratios to he measured are os-pj/ 2 T1, and TlgPTlg, "Hg/ Tlg, Hg/ Hg, and The efficiencies will he... 

Fig. 5. Holding efficiency plotted against number of stirred tanks and against Reynolds number. Curve I— holding tube efficiency against equivalent number of CSTRs. Curve II—holding tube efficiency against Reynolds Number.

The same expression holds for the transition state, except that the sum is over s - 1 oscillators and the frequencies are the vf. The Beyer-Swinehart algoritlnn [38] makes a very efficient direct count of the number... 

By proper design of experiments, guided by a statistical approach, the effects of experimental variables may be found more efficiently than by the traditional approach of holding all variables constant but one and systematically investigating each variable in turn. Trends in data may be sought to track down nonrandom sources of error. 

A one-factor-at-a-time optimization is consistent with a commonly held belief that to determine the influence of one factor it is necessary to hold constant all other factors. This is an effective, although not necessarily an efficient, experimental design when the factors are independent. Two factors are considered independent when changing the level of one factor does not influence the effect of changing the other factor s level. Table 14.1 provides an example of two independent factors. When factor B is held at level Bi, changing factor A from level Ai to level A2 increases the response from 40 to 80 thus, the change in response, AR, is... 

Eig. 5. Target efficiency of spheres, cylinders, and ribbons. The curves apply for conditions where Stokes law holds for the motion of the particle (see also N j ia Table 5). Langmuir and Blodgett have presented similar relationships for cases where Stokes law is not vaUd (149,150). Intercepts for ribbon or... 

The purified ziac solution is fed to the electrolyte recirculating stream at a rate that holds the composition of the electrolyte constant, commonly ranging from 100—200 g H2SO4 and 45—70 g Zn/L. Continuous monitoring of the density and conductivity of the spent acid aids ia control. This is important siace the range of acidity is narrow for maximum current efficiency at any given current density. 

Good management practice will hold inventories at the lowest possible levels consistent with customer satisfaction and efficient plant operation. Excessive inventories are unproductive and are an investment having httle or no rate of return. Excessive inventories should be maintained only when supphes are erratic or rising in price. Management should normally aim for a high inventoiy-turnover ratio, as given by ... 

A relationship of power consumption to collection efficiency is charac teristic of all particulate scrubbers. Attaining increased efficiency requires increased power consumption, and the power consumption required to attain a given efficiency increases as the particle size of the dust decreases. Experience generally indicates that the power consumption required to provide a specific efficiency on a given dust does not vary widely even with markedly different devices. The extent to which this generahzation holds true has not been fully explored, but the known extent is sufficient to suggest that the underlying collection mechanism may be essentially the same in all types of particulate scrubbers. 

Group Efficiency Air-flow capacity, ftV(min-ft of frontal area) Resistance, in water Dust-holding capacity, g/(1000 fP-min of air-flow capacity)... 

A MIXTURE of 120 g. (3 moles) of sodamide (Note i) and 200 cc. of purified mineral oil (Note 2) is ground together in a mortar until the amide is finely pulverized (Note 3). This suspension is transferred to a 2-I. round-bottom, three-necked flask fitted with a reflux condenser holding a calcium chloride tube, a 500-cc. separatory funnel, and an efficient mechanical stirrer through a mercury seal. The mortar and pestle are rinsed with an additional 250 cc. of the oil which is then added to the reaction flask. This is heated in an oil bath maintained at 160-165, the stirrer is started and 203 g. (i mole) of cyclohexylbromopropene (p. 20) is dropped in during one and one-half hours. Ammonia is evolved and this is allowed to pass through the condenser and is collected in water. 

---