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INPUT   DATA

♥ EXAMPLE Of Input/Output

Title

Temperature of water

° C

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OUTPUT   VARIABLES   &   GRAPHS

Variables	Values	Units
♦  Density		g/cc
♦  Viscosity		cP
♦  Heat capacity		cal/g.°C
♦  Thermal conductivity		micro-cal/s.cm.K
♦  Surface tension		dyne/cm
♦  Vapor pressure		mm Hg
♦  Heats of vaporization		cal/g

Properties Of Water

Thermodynamical properties of water are required in many chemical calculations, including the sizing vessels, process pipeline separation of multi-components, gas adsorption and chemical reactor design. The properties include density, viscosity, heat capacity, thermal conductivity surface tension, latent heat of vaporization and vapor pressure. The variation of these properties with temperature (from zero to the critical temperature T_c of 374.2 °C) are considered here. Many correlations for estimating these properties have been published. The correlations of usually polynomial expressions of the form:

y = A + BT + CT² + CT³
with some variations as implemented:
   Density: y = 1.0-[(T + 288.9414)/(508929.2*[T + 68.12963])]*[T - 3.9863]²;      *** updated 14-Sep-2006
   Viscosity: logy = A + B/T + CT + DT²
   Vapour pressure: logy = A + B/T + ClogT + DT + ET²
   Surface tension: y = A[(T_c - T)/(T_c - B)]ⁿ

where
     T = temperature
     T_c = critical temperature
     y = water property in question
     A,B,C,D,E,n = appropriate correlation constants for the property

Tips

    ◊ Use link EXAMPLE Of Input/Output  to demo data entry expectations and results; you may edit & use it as starting point

BIBLIOGRAPHY

• Coker, AK; Fortran Programs For Chemical Process Design, Analysis & Simulation; Gulf Publ. Co, Houston, 1995.
• McCutcheon, SC, Martin, JL & Barnwell, TO Jr.; Water quality, in: Maidment, D.R. (Editor), Handbook Of Hydrology, McGraw-Hill, New York, NY, 1993
• Chopey, NP; Handbook of Chemical Engineering Calculations; McGraw Hill, New York, 2003.