Biomedical Engineering Reference
In-Depth Information
Critical point
Supercritical
water
22.1
Water
Ice
0.1
Vapor
611 Pa
Temperature (°C)
FIGURE 9.1 Phase diagram of water showing the supercritical region.
TABLE 9.1
Properties of Supercritical and Subcritical Water
Subcritical
Water
Supercritical
Water
Supercritical
CO 2
Subcritical
Steam
Properties
Temperature ( C)
25
400
55
150
Pressure (MPa)
0.1
30
28
0.1
Density (kg/m 3 )
997 1
358 1
835
0.52 1
10 2 6
10 2 6 1 0.702
10 2 6
10 2 6 1
Dynamic viscosity (
μ
)
890.8
3
43.83
3
3
14.19
3
(kg/m s)
10 2 9#
10 2 8#
10 2 5#
Diffusivity of small
particles (m 2 /s)
B
1.0
3
B
1.0
3
B
1.0
3
Dielectric constant a
78.46
5.91
1.0
10 2 3 1
10 2 3 1
10 2 3 1
Thermal conductivity (
λ
)
607
330
28.8
3
3
3
(W/m k)
Prandtl number (C p
μ
/
λ
)
6.13
3.33
0.97
a Uematsu and Franck (1980), # Serani et al. (2008),
1
Haar et al. (1984).
the liquid and vapor phases disappears. Temperature and pressure at this
point are known as critical temperature and critical pressure, respectively.
Above these values, water attains supercritical state and hence is called
SCW.
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