Predictions by Correlations

PREDICTIONS BY CORRELATIONS 1 81 And the Benedict-Webb-Rubin equation has many more parameters ... 

The values of the film coefficient for liquids without phase change are usually larger than those for gases, by one or two orders of magnitude. Nonetheless, the liquid-side heat transfer resistance may be the major resistance in an equipment heated by saturated steam. Film coefficient for liquids without phase change can be predicted by correlations such as those in Equations 5.8a, 5.12a, or 5.13. 

In the case of gas-gas or liquid-liquid heat exchangers, the film coefficients for the fluids on both sides of the metal wall are of the same order of magnitude, and can be predicted by correlations, for example, with Equation 5.8a or 5.12a. Neither of the fluid film resistances can be neglected. In a gas-liquid heat exchanger, the controlling resistance is on the gas side, as mentioned before. 

Prediction by correlation. Schmidt (102) developed the following correlation from his fundamental model which describes minimum wetting for random packings. 

Contrary to a popular belief, Borne distillation characteristics still cannot be satisfactorily predicted by correlation, regardless of the number of correlations available for their prediction, Data interpolation with the aid of an empirical procedure is probably the most reliable means of estimating these characteristics, The last two chapters of this book provide the designer with the data needed. 

The conrotatory ring opening predicted by correlation diagrams based on the Woodward-Hoffmann rules for cyclopropyl anions have their conterpart in the isoelectronic aziridines. The interconversions outlined below were investigated by Huisgen et and photochemical ring opening was shown to follow a... 

Shacham, M., Brauner, N Cholakov, G.S. and Stateva, R.P. (2004) Property prediction by correlations based on similarity of molecular structures. AIChE, 50, 2481-2492. 

Aqueous solubility (Sw) and lipophilicity (as measured by partition coefficients between water and octanol, Kow) are among the most common physicochemical properties used to predict a compound s bioactivity or chemical reactivity. In turn, these properties often are predicted by correlations with another phsyco-chemical property these may be called property property relationships (PPRs), For example, /C w is correlated with Sw (I ig. 5 ) and with easily measured indices such as II PI A retention times (/,). Alternatively, some properties used to predict... 

The first consideration when designing or evaluating heat transfer equipment is, on which side of the heat transfer wall will the controlling heat transfer resistance exist. For example, when air is heated by condensing saturated steam, the air-side film coefficient may be 30 kcal h1 m 2 °C 1, while the steam-side film coefficient might be on the order of 10000 kcal h m 2"C 1. In such a case, we need not consider the steam side resistance. The overall coefficient would be almost equal to the air-side film coefficient, which can be predicted by correlations such as those in Equation 5.8 or Equation 5.12. The resistance of the metal wall is negligible in most cases, except when the values of U are very large. 

For a tube located near the front of the bank, the overall or average heat transfer is lower than that predicted by correlations for infinite arrays The necessary correction factor as a function of row number in an array as presented by Kays and London [70] is shown in Fig. 6.30. 

Fig. 7.2 Comparison of experimental IslO with those predicted by correlations for the 3 different channels...

As could be seen from Table 10.2, Hartree-Fock approach significarrtly (by almost 50 %) overestimates values if compared to that predicted by correlated ap-... 

Prediction of electrocyclic reactions has been discussed in unit III. Prediction by correlation diagram method has been done through the example of butadiene cyclobutene interconversion. One important thing noted there is that energies of some molecular orbitals increase (upward slope), but those of... 

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