水的粘度系数

水的黏度表（0〜40C）

温度T

粘度卩

Pa•或

Nsm-2

温度T粘度

Pa-s或

N-s-mKcK

0x10-3

-3

x10

1x10-321-3

x10

2x10-322-3

x10

3x10-323-3

x10

4x10-324-3

x10

5x10-325-3

x10

6

x10-3

26

-3

x10

7x10-327-3

x10

8

x10-3

28

-3

x10

9x10-329-3

x10

10x10-330-3

x10

11x10-331-3

x10

12x10-332-3

X10

13X10-333-3

X10

14X10-334-3

X10

15X10-335-3

X10

16X10-336-3

X10

17X10-337-3

X10

18X10-338-3

X10

19X10-339-3

X10

20X10-340-3

X10

水的物理性质

温度t/

c

饱和蒸

气压

p/kPa

密度p

/kg•m

-3

焓

-

1

H/kJ•kg

1

比定压热容

Cp/kJ•kg

-1•K

1

导热系数入

/10

-2W-m1•K

-1

粘度卩

/10

-5

Pa-s

体积膨胀

系数a/10

-

4

K

1

表面张力

-3-1

(T/10N-m

普兰

德数

Pr

00

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

180

190

200

210

220

230

240

250

260

270

280

290

300

310

320

330

340

350

360109

370264

F3Viscositydecreaswithpressure

(attemperaturesbelow33°C)

Viscousflowoccursbymoleculesmovingthroughthevoidsthatexistbetweenthem.

Asthepressureincreas,thevolumedecreasandthevolumeofthevoids

reduces,sonormallyincreasingpressureincreastheviscosity.

Water'spressure-viscositybehavior[534]canbeexplainedbythe

increadpressure(uptoabout150MPa)causingdeformation,soreducingthe

strengthofthehydrogen-bondednetwork,whichisalsopartiallyresponsibleforthe

ductionincohesivitymorethancompensatesforthereducedvoid

usadirectconqueneeofthebalaneebetweenhydrogenbonding

effectsandthevanderWaalsdispersionforces[558]inwater;hydrogenbonding

erpressures(andden

sities),thebalaneebetweenhydrogenbondingeffectsandthevanderWaals

dispersionforcesistippedinfavorofthedispersionforcesandtheremaining

hydrogenbondsarestrongerduetotheclorproximityofthe

contributingoxygenatoms[655].Viscosity,then,increaswithpressure.

Thedashedline(opposite)indicatestheviscosityminima.

Thevariationofviscositywithpressureandtemperaturehasbeenudavidenee

thattheviscosityisdeterminedmorebytheextentofhydrogenbondingratherthan

hydrogenbondingstrength.

Self-diffusionisalsoaffectedbypressurewhere(atlowtemperatures)boththe

translationalandrotationalmotionofwateranomalouslyincreaasthe

pressureincreas.