Correlation

Physics

Nucleate boiling

Mathematics

Heat transfer

Data mining

Statistics

Boiling

Heat flux

Composite material

Chart

Materials science

Range (aeronautics)

Geometry

Boiling heat transfer

Computer science

Data correlation

Evaporation

Thermodynamics

ASHRAE winter conference papers

In 1976, the author presented in graphical form a general correlation named CHAPT for the estimation of heat transfer coefficients during saturated boiling at subcritical heat flux in tubes and annuli. It was compared to 780 data points from 19 independent experimental studies and found to have a mean deviation of 14% using data that included eight fluids and a wide range of parameters. The correlation was shown to be applicable to both horizontal and vertical tubes and the difference between the two orientations was clearly quantified. Because of its applicability to a wide range of fluids and conditions, including horizontal and vertical orientations, this correlation has drawn considerable attention from the scientific and engineering community. However, the use of the CHART correlation in computer calculations has been difficult because of its graphical form. After receiving several inquiries about availability of equations expressing this correlation, the author has developed and presents in this paper equations that represent the CHART correlation accurately. Since its publication in 1976, this correlation has been tested against a large amount of additional data for tubes by the author and other researchers, with the results summarized here. Furthermore, the correlation was compared with only a fewmore » data points for evaporation in annuli and there were questions regarding application to small annular gaps. A large amount of additional data for annuli have now been analyzed, and the results of this analysis are presented in this paper.« less

Chart correlation for saturated boiling heat transfer: Equations and further study