Correlating Constants

Acentric Factor The acentric factor of a compound co is defined in terms of the reduced vapor pressure evaluated at a reduced temperature of 0.7 as 

Recommended Method Ambrose-Walton modification of Lee-Kesler vapor pressure equations. 

Input data T0, Pc, and a single vapor pressure point (e.g., the normal boiling point). 

Description See Eq. (2-25) for the equations used in this method. The vapor pressure equation is inverted to obtain the acentric factor from a single experimental vapor pressure point. 

Example Calculate the acentric factor of chlorobenzene with a known value for Th. 

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C, Correlating constant proportionahty coefficient Dimensionless Dimensionless... 

Using correlation constants from Table 1 and Equation 1 at temperature of 600°K, we obtain ... 

Data Source. The correlation constants were determined from a least-squares fit of data from the literature.-- - In most cases, average deviations between calculated and reported data were less than 0.6kjoules/g-mol. 

Table 1 provides states the temperature range over which the correlation constants are reported from the literature. Estimates from this expression using the constants in Table 1 are generally accurate and typically provide agreement to well within + 1% compared to experimentally measured thermal conductivities. 

Table 1. Correlation Constants for Estimating Thermal Conductivity of Gases...

The correlation constants required for Equations 8-127 and 8-128 are obtained by specifying a desired recovery of the light key component LK in the distillate and the recovery of the heavy key component HK in the bottoms. Then the constants are calculated as follows ... 

The recoveries of the non-key components are estimated by first calculating the correlation constants ... 

Constants developed in original article Correlation constants (distillation recoveries [141])... 

Revised Packed Tower Pressure Drop Correlation Constants for Towers Operating Below Flooding Region... 

The correlation constants are displayed in an easy-to-use tabular format which is especially suited for rapid engineering usage with the personal computer or hand calculator. Correlation and experimental results are in favorable agreement. 

Substitution of the correlation constants from the table and temperature into the correlation equation /3b, = 7.883E-O4(l-(40 + 273.15)/469.65)- " ... 

Assuming the exponential decay of q, the autocorrelation function can be represented by T the time constant or correlation constant of the measured system as q, = exp (— /Tx), Tx = t for q, = 0. See for instance Unmixed, stratified obj ts such as soil and rock, usually cannot be represented by a simple correlation constant derived from the exponential autocorrelation function. Here another measure is introduced, the semivariance. The semivariance can be computed from 35-39)... 

For objects that can be modelled by the time or correlation constant (see e.g. 

In soil science one usually has to do with two or threedimensional objects that cannot be represented by correlation constants. Here the size and the number of samples must be obtained in other ways. In this case often an intermediate step is Kriging, mapping of lines or planes of equal composition For the simplest case, punctual... 

Application of these reconstruction methods can be described as the interpolation of object composition between sample points by means of an exponential function, characterised by the correlation constant. 

The correlating constants, lor Uk equation id Lyman and Danner arc available 1 w,lifr The equation wn used to extend the data... 

Table II. Regression statistics for each partitioning alcohol in Figure 2 showing the correlation constants of Equation 2. Underneath the correlation constants are the upper and lower bounds of the 95% confidence interval.

The physical property system is supported by a data file on both conventional compounds and on typical coal analyses and data. The data bank contains correlation constants for over 400 conventional compounds and extensive data for thirteen characteristic coals. A Data File Management system permits a user to modify the data files, to create his own private data files, and... 

Table 7-3 Summary of Empirical Relations for Free Convection in Enclosures in the Form of Eq. (7-60), Correlation Constants Adjusted by... 

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