Coupled transport processes in semipermeable media
The thermodynamics of irreversible processes (TTIP) is used to derive governing equations and phenomenological equations for transport processes and chemical reactions in water-saturated semipermeable media. TTIP is based on three fundamental postulates. The first postulate, the assumption of local equilibrium, allows the formulation of balance equations for entropy. These equations are the bases for the derivation of governing equations for the thermodynamic variables, temperature, pressure, and composition. The governing equations involve vector fluxes of heat and mass and scalar rates of chemical reactions; in accordance with the second postulate of TTIP, these fluxes and rates are related, respectively, to all scalar driving forces (gradients of thermodynamic variables) acting within the system. The third postulate of TTIP states equality (the Onsager reciprocal relations) between certain of the phenomenological coefficients relating forces and fluxes. The description by TTIP of a system undergoing irreversible processes allows consideration of coupled transport processes such as thermal osmosis, chemical osmosis, and ultrafiltration. The coupled processes can make significant contributions to flows of mass and energy in slightly permeable, permselective geological materials such as clays and shales.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6494706
- Report Number(s):
- LBL-25618; ON: DE91004139
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
EQUATIONS
ANALYTICAL SOLUTION
POROUS MATERIALS
HEAT TRANSFER
MASS TRANSFER
ENTROPY
IRREVERSIBLE PROCESSES
NONLINEAR PROBLEMS
NUMERICAL SOLUTION
ONSAGER RELATIONS
OSMOSIS
PERMEABILITY
PRESSURE GRADIENTS
TEMPERATURE GRADIENTS
DIFFUSION
ENERGY TRANSFER
MATERIALS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
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