水的粘度計(jì)算表

1、水的黏度表（04 0 C ）溫度T粘度卩Pa 或N s m-2溫度T粘度Pa - s 或NsmKcK0x 10-3-3x 101x 10-321-3x 102x 10-322-3x 103x 10-323-3x 104x 10-324-3x 105x 10-325-3x 106x 10-326-3x 107x 10-327-3x 108x 10-328-3x 109x 10-329-3x 1010x 10-330-3x 1011x 10-331-3x 1012x 10-332-3x 1013x 10-333-3X 1014X 10-334-3X 1015X 10-335-3X 1016X 10

2、-336-3X 1017X 10-337-3X 1018X 10-338-3X 1019X 10-339-3X 1020X 10-340-3X 10水的物理性質(zhì)溫度t/ r飽和蒸 氣壓 p/kPa密度p-3/kg m焓-1H/kJ kcj比定壓熱容-1 -1cp/kJ kg K導(dǎo)熱系數(shù)入-2 -1 -1/10 W- m K粘度卩-5/10 Pa s體積膨脹 系數(shù)a/10 4 K表面張力-3,.1(T /10 N m普蘭 德數(shù)Pr001020304050607080901001101201301401501601701801902002102202302402502602702802903003

3、10320330340350360109370264F3? Viscosity decreases with pressureC)(at temperatures below 33Viscous flow occurs by molecules moving through the voids that exist between them. As the pressure in creases, the volume decreases and the volume of these voidsreduces, so no rmally in creas ing pressure in cr

4、eases the viscosity.Mere-5°C2.2h30° CJ cDncr0 / 200 C J 400 ?600 y； 800 i '1000二 % £Pressurw. MPH U 宓n-100°ChWater's pressure-viscosity behavior can be expla ined by the in creased pressure (up to about 150 MPa) caus ing deformati on, so reduci ng the stre ngth of the hyd

5、rogen-bonded network, which is also partiallyresponsiblefor the viscosity.This reducti on in cohesivity more tha n compe nsates for the reduced void volume.It is thus a direct consequenee of the between hydrogen bonding effects and the van der Waals dispersion forces in water; hydrogen bonding preva

6、iling at lower temperatures and pressures. At higher pressures (and den sities), the betwee n hydroge n bonding effects and the van der Waals dispersi on forces is tipped in favor of the dispersion forces and the remaining are stronger due to the closer proximity of the con tribut ing oxyge n atoms

7、. Viscosity, the n, in creases with pressure. The dashed line (opposite) in dicates the viscosity mini ma.The variationof viscosity with pressure and temperature has been used as evideneethat the viscosity is determ ined more by the exte nt of hydroge n bonding rather tha n hydroge n bonding stre ngth.both the pressureSelf-diffusion is also affected by pressur