Document Type
Thesis
Date of Award
6-30-1958
Degree Name
Master of Science in Chemical Engineering - (M.S.)
Department
Chemical Engineering
First Advisor
Joseph Joffe
Second Advisor
C. L. Mantell
Third Advisor
George C. Keeffe
Abstract
A generalized correlation is presented for the difference in heat capacities at constant pressure and constant volume, Cp-Cv, as a function of reduced pressure with parameters of reduced temperature. The correlation covers a pressure range of pr a 0.2 to pr = 15.0 and a temperature range of Tr = 1.0 to Tr = 5.5. The correla- tion was based on values of Cp-Cv calculated from the Benedict - Webb - Rubin Equation of State for five hydrocarbons, namely, methane, ethylene, ethane, propane, and n-butane.
The results show that Cp-Cv approaches the universal gas constant, R, for all temperatures as the pressure approaches zero. in general, at any particular pressure, the value for Cp-Cv decreases with increasing temperature. The average deviation of the generalized correlation from the data on which it was based is ±0.93%. Deviations as high as 8% were found in the region of very high reduced pressure. A comparison has been made with an earlier correlation presented by Edmister. The relative accuracies of the two correlations have been discussed. A comparison has also been made with data for nitrogen and carbon mon-oxide. The results indicate that this correlation can be used not only for hydrocarbons, but for other non-polar or slightly polar gases as well.
Recommended Citation
Bleich, Leon, "A generalized correlation for the effect of pressure on the difference in heat capacities of gases" (1958). Theses. 2655.
https://digitalcommons.njit.edu/theses/2655
