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Abstract

The absolute viscosity at atmospheric pressure was determined experimentally for the vapour phase of two halogenated hydrocarbon compounds, refrigerants R12 (CCl₂F₂) and R22 (CHCl₂F) in the general temperature range −39·7° to 91·8°C.

The maximum error of the data is believed to be ±3 per cent. Comparison with previous secondary measurements on the same compounds reveals that the maximum deviation of previous measurements are +5 per cent and −6 per cent for R12 and R22, respectively, over the common temperature range.

The data obtained in this work and by others were correlated using third and fourth degree polynomials, a power function of the absolute temperature, and a collision theory approach, which yielded values for the reduced dipole energy, the velocity collision diameter, and the maximum energy of attraction for the molecules. Comparison of the data with that predicted by simple kinetic theory has been made.

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References

Latto

Al-Saloum

A. J.

‘Extensive viscosity correlations for refrigerants (halogenated hydrocarbons) in liquid and vapour phases’, A.S.H.R.A.E. Trans. 1970 76 (Pt 1, November) (presented at Semi-annual Meeting A.S.H.R.A.E., San Francisco, January 1970).

Boussinesq

Comptes Rendus 1890 110, 1160, 1238; 1891 113, 9, 49.

Langhaar

‘Steady flow in the transition length of a straight tube’, J. appl. Mech. 1942 (June), A55, A58.

Nikuradse

Applied hydro and aeromechanics by Prandtl

Tietjens

O. G.

, 1934 1st ed., 27 (McGraw-Hill Book Co., New York).

Latto

‘Viscosity of steam at atmospheric pressure’, Int. J. Heat Mass Transfer 1965 8, 689; and ‘The viscosity of steam at atmospheric pressure’, Technical Report No. 16, University of Glasgow, 1965.

Barr

A monograph of viscometry 1931 (Oxford University Press, London).

Schultz

Ann. Physik 1901 5, 147.

Fisher

‘The coefficients of gas viscosity’, Phys. Rev. 1909 28, 73.

Carr

N. L.

‘The viscosity of gas mixtures at high pressures’, Ph.D. thesis, Illinois Inst. Tech. 1952.

10.

Levy

‘The accuracy of bubble meter methods for gas flow measurements’, J. Sc. Inst. 1964 41, 449.

11.

Harrison

Darroch

I. F.

‘Air flow measurement by soap film method’, N.E.L. Report No. 302, Ministry of Technology, 1967.

12.

Thermophysical Properties Research Centre data book 1967 Vol. 2 (Purdue University).

13.

Hillsenrath

‘Tables of thermodynamic and transport properties of air, nitrogen, etc.’, 1960 (Pergamon Press, New York).

14.

Coughlin

‘The vapour viscosities of refrigerants’, Ph.D. thesis, School of Mechanical Engineering, Purdue University, Indiana, 1953.

15.

Willbers

O. J.

‘Viscosity measurement for several fluorinated hydrocarbon vapours at low temperatures’, M.Sc. thesis in Mechanical Engineering, Purdue University, 1961.

16.

Benning

A. G.

Markwood

W. H.

Jun.

‘The viscosities of Freon refrigerants’, Refrigng Engng 1939 (April).

17.

Kamien

C. Z.

Witzell

O. W.

‘Effect of pressure and temperature on the viscosity of refrigerants in the vapour phase’, A.S.H.R.A.E. Trans. 1959 65, (No. 1693), 663.

18.

Tsui

C. Y.

‘Viscosity measurement for several fluorinated hydrocarbon vapours at elevated pressures and temperatures’, M.Sc. thesis in Mechanical Engineering, Purdue University, 1959.

19.

Makita

‘The viscosity of Freons under pressure’, Rev. Phys. Chem. Japan 1954 24 (No. 2).

20.

Krieger

F. J.

‘Viscosity of polar acids’, Rand Report No. 646, 1951.

21.

Wellman

E. J.

‘Viscosity determination of several fluorinated hydrocarbon vapours with a rolling ball viscometer’, Ph.D. thesis in Mechanical Engineering, Purdue University, 1955.

Absolute Viscosity of CCl 2 F 2 and CHCl 2 F

Abstract

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