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My Project
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Binary coefficients for water and nitrogen. More...
#include <H2O_Air.hpp>
Static Public Member Functions | |
| template<class Evaluation > | |
| static Evaluation | henry (const Evaluation &temperature) |
| Henry coefficent | |
| template<class Evaluation > | |
| static Evaluation | gasDiffCoeff (const Evaluation &temperature, const Evaluation &pressure) |
| Binary diffusion coefficent | |
| template<class Evaluation > | |
| static Evaluation | liquidDiffCoeff (const Evaluation &temperature, const Evaluation &) |
| Lacking better data on water-air diffusion in liquids, we use at the moment the diffusion coefficient of the air's main component nitrogen!! | |
Binary coefficients for water and nitrogen.
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inlinestatic |
Binary diffusion coefficent ![$\mathrm{[m^2/s]}$](form_9.png)
| temperature | the temperature |
| pressure | the phase pressure |
Walker, Sabey, Hampton: Studies of heat transfer and water migration in soils. Dep. of Agricultural and Chemical Engineering, Colorado State University, Fort Collins, 1981.
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inlinestatic |
Henry coefficent ![$\mathrm{[N/m^2]}$](form_8.png)
Henry coefficent See: Stefan Finsterle, 1993 Inverse Modellierung zur Bestimmung hydrogeologischer Parameter eines Zweiphasensystems (fitted to data from the book "Tchobanoglous & Schroeder: Water Quality: Characteristics", Addison-Wesley, 1985)
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inlinestatic |
Lacking better data on water-air diffusion in liquids, we use at the moment the diffusion coefficient of the air's main component nitrogen!!
Diffusion coefficent ![$\mathrm{[m^2/s]}$](form_9.png)
The empirical equations for estimating the diffusion coefficient in infinite solution which are presented in Reid, 1987 all show a linear dependency on temperature. We thus simply scale the experimentally obtained diffusion coefficient of Ferrell and Himmelblau by the temperature.
See:
R. Reid et al.: "The properties of Gases and Liquids", 4th edition, pp. 599, McGraw-Hill, 1987
R. Ferrell, D. Himmelblau: "Diffusion Coeffients of Nitrogen and Oxygen in Water", Journal of Chemical Engineering and Data, Vol. 12, No. 1, pp. 111-115, 1967