Viscosity of liquefied gases at pressures between 1 and 100 atmosphere

Physica 32 2171-2172

Van Itterbeek, A. Hellemans, Miss J. Zink, H. Van Cauteren, Miss M. 1966

LETTER

TO THE EDITOR

Viscosity of liquefied gases at pressures between 1 and 100 atmosphere Using an oscillating disk viscometer, viscosity measurements were made in liquid nitrogen, liquid oxygen and liquid argon, as a function of pressure and temperature. These measurements are an extension of our former measurements 1) to higher pressures (about 100 atm). In the tables below, we give the experimental results at different temperatures, as a function of pressure.

Values

of n I

in milliuoise

r = 70.0’ ‘K

Ptb -

for liauid

? -

11 -

?1

Nz

7. = 83.9”K

T = 77.3”K

: -

2r = 90.1°K 7) _

1.3

2.16 _

2.0

_

3.9 10

-

1.64

1.32

1.02 -

29

2.22 -

1.69

1.35

1.04

39 48

2.30 _

1.74

1.36

1.07

1.76

1.39

1.09

58

2.38 -

1.80 1.84

1.39 1.41

1.10

2.45 -

1.a6

1.43

1.13

1.08 -

1.45 -

1.14 -

-

1.47

0.5

19

68 77 a7 97

2.48 -

98

-

96

-

_

-

_

1.30 -

1.59

1.28

1.57 -

1.90

-

-

0.99

1.11

1.16

In all three cases, the viscosity increases linearly with pressure in the range from l-100 atm. In our former measurements, we found a much stronger increase of the viscosity for oxygen than for nitrogen. This effect was not real and was probably due to a change of the elastic properties of the platinum suspension wire, during the measurements. In the last measurements, we used a phosphorbronze suspension wire and we found an increase of the viscosity for oxygen which agreed better with the results for nitrogen and argon. The pressure on the liquid was obtained by compression of helium. In order to see whether there was any influence on the viscosity from the solution of helium in the

-

2171 -

2172

VISCOSITY

OF LIQUEFIED

GASES

BETWEEN

1 AND

100

ATM

Values of TJin millipoise

PWII

_

?I

0.1

for liquid

l- = 77.2”K

1^ = 69.9”K

_

n

-

0s

.i

r = 83.3”K

- = 89.9”K

-

t _

11 _

_

_ 1.92

0.2

3.91 -

0.5

-

2.79 -

1.1

-

-

2.42 _

-

-

-

2.50

1.95

19.4 28.0

4.03 -

2.09 -

2.51

2.00

2.55

2.04

38.9 48.5

4.11 -

2.97 -

2.60 2.65

2.08 2.14

58.0

4.21 _

3.06 _

2.69

2.18

2.76

2.23

4.33 -

3.13

2.27

3.15

2.82 -

4.44

3.21

9.6

67.4 77.1

86.5 96.2

-

Values of R in millipoise

i-

r =.84.3”K

P*tlll

Second

_

-

for liquid

run

7) _

9 _

2.34 -

2.37

2.51

2.51 _

7) 2.08 -

19.8

-

2.96

38.8

3.02 _

3.08 -

3.08 _

_

2.54 _

_

_

_

3.20 _

3.21 -

2.57 2.60

_

-

48.7 56.1 58.3 67.3 77.3 87.3 96.6

-

-i Second run

71

1.3

.4r

r = 89.9”K

2.86 -

1.0

2.30 _

-

2.42

2.58 2.64 2.68 _

2.63 2.69

-

liquid, we also measured once with hydrogen as compressing gas. This had no influence on the viscosity of the liquid. The density values for argon were taken from measurements by Van Itterbeek and Verbeke 2). Acknowledgments: We take the oppertunity of expressing sincere thanks to the Belgian Ministry of Culture and Education for its financial help during these measurements. Received

A. VANITTERBEEK

28-7-66

Miss J.HELLEMANS H.ZINK M~~~M.VANCAUTEREN Instituut

voor

Lage Temperaturen en Technische Leuven, Belgie

REFERENCES 1) Van

Itterbeek,

A., Zink,

2)

Itterbeek,

A. and Verbeke,

Van

H. and Hellemans, O., Physica

Miss J., Physica 26 (1960) 931.

32 (1966) 489.

Fysika