Forster-Zuber correlation

Fio. 14. The Forster-Zuber correlation for nucleate boiling of four liquids. Only data near the critical AT are represented (F6). 

Question by J. A. Clark, University of Michigan I believe the Forster—Zuber correlation is for the maximum heat flux points. How is this correlation justified for application to the nucleate-boiling data Did you correlate the peak flux data with any of the existing correlations ... 

Answer by Author It is our understanding that the Forster—Zuber correlation applies also to the entire nucleate-boiling curve. No correlation was attempted with the peak flux data since our peak flux data are slightly lower than a true peak, and we were not primarily concerned with locating this point. 

A test of Eq. (21), or (20), is shown in Fig. 14. The same maximum heat-flux data of Cichelli and Bonilla (C2) for three organic liquids which produced three separate lines by Rohsenow s correlation give a single line on the Forster-Zuber plot. The data of Kazakova (Kl) for water boiling at pressures varying from 10 to 80% of the critical pressure also fit the line nicely. 

In the absence of experimental data, the correlation given by Forster and Zuber<86) may be used to estimate pool boiling coefficients, although the following reduced pressure correlation given by M()STlNSKl(9ri) is much simpler to use and gives reliable results for h (in W/m2 K) ... 

Forster and Zuber desired a correlation in the form of Eq. (1). A Nusselt number was therefore defined as... 

In addition to the equations of Rohsenow and of Forster and Zuber, which are the most theoretical equations now available, there exist many equations which are simply empirical correlations. Little pretense is made that these additional equations are defensible on theoretical grounds beyond simple dimensional analysis. A few of these are given below. 

The correlation of Forster and Zuber [106] was developed in 1955 in a dimensionless form. It is commonly used in the following dimensional form (where all of the units should be SI) ... 

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