Power correlation

Generalized Correlations. Generalized correlations are often the only recourse when a property value cannot be determined from empirical correlations or by other means. Several powerful correlating techniques fall under this category, including the principle of corresponding states (3,17), reduced property models (1), and the Polanyi-type characteristic curve for microporous adsorbents (14). 

Power correlation number, [PHVj + K.) iVjJVc), dynes/m ... 

Figure 10.58. Power correlation for single three-bladed propellers baffled, (from Uhl and Gray (1967) with permission), p = blade pitch, D = impeller diameter,...

The gassed condition is important in mass transfer calculations. In general, the ungassed- and gassed-power are related by the equation PG = P. The value of P is calculated from the power correlation for Rushton turbines [16]. The correction factor, y, is calculated from the following equations ... 

Gassed Impeller Power Bakker et al. (op. cit.) have given a gassed power correlation for the 6BD and CD-6 impellers. 

Early data on impeller power requirements (H9) indicated a proportionality between power input and roughly the cube of impeller speed for a sand-water mixture. Data taken by Mack and Marriner (M4), using flat-blade turbines in baffled tanks, also have shown the power requirements to vary with the cube of impeller speed. These sketchy results seem to suggest the use of the one-liquid-phase power correlations of Section III, possibly with some appropriate density and viscosity corrections as in the case of liquid-liquid systems. If the opportunity exists, actual measurements on the system of interest should be made. 

L isterti United States arc yellow and not usually psychoactive. Those in the western states are red nr orange their pharmacological power correlates with cap color, the reddest mushrooms being strongest. 

Figure 10.4 presents the power correlations for the Chemineer Standard 4BP and FIE-3 impellers as a function of D/T at a C/T of 1/3. Figure 10.5(a), (b), and (c) present power correlations for myriad impellers, with the figure title and figure caption explaining the details for each impeller. Figure 10.6 presents additional power correlations for six additional impellers in fully baffled vessels. 

The application of the presented power correlations are illustrated in Examples 10.1 and 10.2. 

Diatomic Molecules Relativistic. - Application of relativistic methods are becoming much more widespread. In addition to being essential for work on heavier atoms it is becoming more apparent that the high level of accuracy attainable on small molecules with modern powerful correlated procedures is such that comparison with experiment at the precision attainable will require careful relativistic corrections to be applied. 

Agitator speed calculate speed based on speed determined in pilot plant using volume ratio, impeller diameter in power correlation. 

An experimental result in a liquid mixing experiment for the power correlation using a pitched-blade turbine shows that in the viscous regime, the power number is related to the Reynolds number by the following data ... 

Thus, while it is difficult to test all combinations the approach can generate extremely large data sets of information that maps out the variable space. H owever, the problem can be somewhat like undersea treasure hunting in that, unless logic is used to choose the area in which to search, a lot of sea floor can be explored with no useful results. Powerful correlations can be developed only, therefore, if data from information rich areas that have a fundamental relationship to the properties of interest are mined. The point in all this is that without logical scientific thought to plan these experiments in regions of maximum potential a lot of useless information can be collected. 

POWER CORRELATION. To estimate the power required to rotate a given impeller at a given speed, empirical correlations of power (or power number) with the other variables of the system are needed. The form of such correlations can be found by dimensional analysis, given the important measurements of the tank and impeller, the distance of the impeller from the tank floor, the liquid depth, and the dimensions of the baffles if they are used. The number and arrangement of the baffles and the number of blades in the impeller must also be fixed. The variables that enter the analysis are the important measurements of tank and... 

POWER CORRELATIONS FOR SPECIFIC IMPELLERS. The various shape factors in Eq. (9.16) depend on the type and arrangement of the equipment. The necessary measurements for a typical turbine-agitated vessel are shown in Fig. 9.7 the corresponding shape factors for this mixer are Sj = DalD S2 = EID S = L/D , S4 == W /Od. S5 = J/D, and Sg = HfD,. In addition, the number of baffles and the number of impeller blades must be specified. If a propeller is used, the pitch and number of blades are important. 

Power correlation for a six-blade turbine in non-newtonian liquids. 

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