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1. Liquid Water density correlation : ρ=f(T)

2. Liquid water viscosity
correlation : μ=f(T)

3. Liquid water thermal
conductivity correlation : λ=f(T)

4. Water saturated vapor pressure
: Psat=f(T)

5. Water properties : Free Excel
calculation tool

Water critical parameters : [Dincer]

- Tc = 373.984 c
- Pc = 220.64 bar
- vc = 3.106 dm3/kg

Water triple point parameters : [Dincer]

- Tt = 0.01 c
- Pt = 611.732 Pa

*How does the density of liquid water vary with temperature ?
What is the equation to calculate the density of water ?
*

ρ=0.14395/(0.0112^[1+(1-T/649.727)^0.05107]) [DDB]

With

ρ = density (kg/m3)

T = temperature (K)

A = 0.14395

B = 0.0112

C = 649.727

D = 0.05107

Range of validity : [273 ; 648] K

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*How does the viscosity of liquid water vary with temperature ?
What is the equation to calculate the viscosity of water ?*

μ = exp(-3.7188+578.919/(-137.546+T))

With

μ = viscosity (mPa.s)

T = temperature (K)

A = -3.7188

B = 578.919

C = -137.546

Range of validity : [273 ; 373] K

*How does the thermal conductivity of liquid water vary with
temperature ? What is the equation to calculate the thermal
conductivity of water ?*

λ'=-1.48445+4.12292*T'-1.63866*T'2 [NIST]

With

λ' = λ(T)/λ(298.15)

λ(298.15) = 0.6065 W.m^{-1}.K^{-1}

λ(T) = thermal conductivity of water at temperature T (W.m^{-1}.K-1)

T' = T/298.15

T = temperature of water (K)

Range of validity : [274 ; 370] K

*How does the vapor pressure of water vary with temperature ?
What is the equation to calculate the vapor pressure of water ?*

log(Ps) = 8.07131 - 1730.63 / (233.426 + T)

With

Ps = Saturation pressure (mmHg) - note, to switch to Pa, multiply by 133.322 Pa/mmHgT = temperature (°c)

A = 8.07131

B = 1730.63

C = 233.426

Range of validity : [1 ; 100] °c

You can access an Excel tool to apply the formula detailed above and make calculations. This tool contains :

- Water density calculator
- Water viscosity calculator
- Water thermal conductivity calculator
- Water vapor pressure calculator

Source

[Dincer] Drying Phenomena: Theory
and Applications, First Edition. İbrahim Dinçer and Calin Zamfirescu,
John Wiley & Sons (excerpt available online)

[NIST] Standard reference data for the thermal conductivity of water, Ramires et al, American Institute of Physics and American Chemical Society, 1995

[NIST] Standard reference data for the thermal conductivity of water, Ramires et al, American Institute of Physics and American Chemical Society, 1995

[DDN] Dortmund Data Bank (online)