水的粘度計(jì)算表

1、水的黏度表（040 C ）溫度T粘度卩Pa 或N s m-2K0X 10-31X 10-32X 10-33X 10-34X 10-35X 10-36X 10-37X 10-38X 10-39X 10-310X 10-311X 10-312X 10-3溫度T粘度Pa s 或KN - s -m-3X 1021-3X 1022-3X 1023-3X 1024-3X 1025-3X 1026-3X 1027-3X 1028-3X 1029-3X 1030-3X 1031-3X 1032-3X 1013X 10-314X 10-315X 10-316X 10-317X 10-318X 10-319X 1

2、0-320X 10-333-3X 1034-3X 1035-3X 1036-3X 1037-3X 1038-3X 1039-3X 1040-3X 10水的物理性質(zhì)溫度t/ V飽和蒸 氣壓 p/kPa密度P/kg m焓-1H/kJ kgi比定壓熱容-1-1o/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(T /10-3N m1普蘭 德數(shù)Pr001020304050607080901001101201301401501601701801902002102202302402502602702802903003103203

3、30340350360109370264F3? Viscosity decreases with p ressure C)(at temp eratures below 33Viscous flow occurs by molecules moving through the voids that exist between them. As the p ressure in creases, the volume decreases and the volume of these voids reduces, so no rmally in creas ing p ressure in cr

4、eases the viscosity.Z5f= o 4彳司0522PT1,D Kd.n1.51bC 品-I P 3町=30C； ILd*L； LJJ；_ ru ;曙I 1rf-s0 ； 200 .400 7600 :8001000Pressure, MPa 宀工p ressure-viscositybehavior can be explained by the in creased p ressureWaters(up to about 150 MPa) caus ing deformati on, so reduci ng the stre ngth of the hydrogen-bo

5、nded network, which is also partiallyresponsible for the viscosity.This reducti on in cohesivity more tha n compen sates 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 prevailing a

6、t lower temp eratures and p ressures. At higher p ressures (and den sities), the betwee n hydroge n bonding effects and the van der Waals dis persi on forces is tipped in favor of the dispersion forces and the remaining arestronger due to the closerp roximity of the con tribut ing oxyge n atoms . Vi

7、scosity, the n, in creases withp ressure. The dashed line (opp osite) 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.Self-diffusion is also affected by pressure where (at low te