Abstract
Experimental studies have been made for heat transfer during nucleate pool boiling on a horizontal platinum wire in nonazeotropic binary mixtures of R12+R113, R134a+R113, R22+R113 and R22+R11 at a pressure from 2 to 8 bar and at a heat flux up to 1.0 × 105 W/m2. The substances employed were chosen such that the components of a given mixture have a large difference in saturation temperatures. A correlation was derived by improving Thome's correlation, predicting the heat transfer coefficients for the mixtures within an accuracy of ±25 percent. It is also shown that the correlation can be applicable for mixtures with a small difference in saturation temperatures within an accuracy of ±20 percent. The heat transfer coefficients for the mixtures are smaller than that for the single components over the entire concentration range. The heat transfer coefficients for the mixtures depend on the system pressures and heat fluxes at a lesser extent than that for the single components.
Zusammenfassung
In einer experimentellen Studie wurde der Wärmeübergang beim Blasen-Behältersieden an einem horizontalen Platindraht in den nichtazeotropen binären Gemischen von R12+R113, R134a+R113, R22+R113 und R22+R11 bei Drükken von 2 bis 8 bar und Wärmeflüssen bis 105 W/m2 untersucht. Bei den eingesetzten Substanzen lagen die Sättigungstemperaturen der Gemischkomponenten weit auseinander. Durch Verbesserung der von Thome angegebenen Korrelation lassen sich die Wärmeübergangskoeffizienten mit einer Genauigkeit von ±25% vorausberechnen. Es zeigte sich ferner, daß diese Korrelation bei geringem Unterschied der Sättigungstemperaturen eine Genauigkeit von ±20% beanspruchen kann. Die Wärmeübergangskoeffizienten liogen für Gemische im gesamten Konzentrationsbereich unter jenen der Einzelk omponenten und zeigen gegenüber letzteren geringere Abhängigkeit vom Systemdruck und von den Wärmestromdichten.
Similar content being viewed by others
Abbreviations
- B 0 :
-
constant [Eq. (2)]
- C :
-
mass fraction of a low boiling component in a system
- h :
-
heat transfer coefficient [W/(m2K)]
- h id :
-
ideal heat transfer coefficient in a mixture [W/(m2 K)]
- H fg :
-
latent heat in evaporation [kJ/kg]
- k :
-
coefficient affected by a heat flux [Eq. (4)]
- K 0 :
-
constant [Eq. (1)]
- P :
-
pressure [bar]
- P c :
-
critical pressure [bar]
- q :
-
heat flux [W/m2]
- T s :
-
saturation temperature [K]
- ΔT E :
-
temperature difference between boiling and dew points [K]
- ΔT id :
-
ideal wall superheat in a mixture [K]
- ΔT sat :
-
wall superheat [K]
- x, y :
-
mole fractions of liquid and vapor
- β L :
-
mass transfer coefficient [m/s]
- ϱ L, ϱV :
-
densities of liquid and vapor [kg/m3]
- 1:
-
lower boiling component
- 2:
-
higher boiling component
References
Jungnickel, H.; Wassilew, P.; Kraus W. E.: Int. J. Refrig. 3 (1980) 129–133
Schlünder, E. U.: Int. Chem. Eng. 23 (1983) 589–599
Schmadl, J.: Thesis, University of Karlsruhe, 1982
Gorenflo, D.; Bieling, V.: Heat and mass transfer in refrigeration and cryogenics. Hemisphere Publ. Corp., Washington (1987) 243–257
Gorenflo, D.; Blein, P.; Herres, G.; Rott, W.; Schomann, H.; Sokol, P.: Int. J. Refrig. 11 (1988) 257–263
Bier, K.; Schmadl, J.; Gorenflo, D.: Int. Chem. Eng. 24 (1984) 227–231
Fujita, Y.; Ohta, H.: Private communications, 1990
Nishiumi, H.; Saito, S.: J. Chem. Eng. Japan 8 (1975) 356–360
Vines, R. F.; Wise, M.: The platinum metals and their alloys. McGraw-Hill Book Comp. Inc. New York, 1941
Nishikawa, K.; Fujita, Y.: Advances in Heat Transfer 20 (1990) 18–23
Nishikawa, K.; Fujita, Y.: Advances in Heat Transfer 20 (1990) 2–18
Thome, J. R.: Int. J. Heat Mass Transfer 26 (1983) 965–974
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Inoue, T., Monde, M. Nucleate pool boiling heat transfer in binary mixtures. Wärme- und Stoffübertragung 29, 171–180 (1994). https://doi.org/10.1007/BF01548601
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01548601