Coherence principle8/6/2023 Application to heat and mass transfer problems. This process is experimental and the keywords may be updated as the learning algorithm improves.Īerivos A (1956) Method of characteristics technique. These keywords were added by machine and not by the authors. Migration and fate of pollutants in geological formations, especially in aquifers, also is a phenomenon of this type, if a very complex one owing to the irregular, three-dimensional geometry and the usually highly nonuniform permeability of the medium in which it occurs, to the nonuniformity and irregular distribution of soil components that interact with the pollutants, and to chemical reactions which the pollutants may undergo. Examples include multicomponent fixed-bed adsorption and ion exchange (Helfferich and Klein, 1970 Rhee et al., 1970, 1986 Vermeulen et al., 1984 Ruthven, 1984), preparative chromatography (Helfferich and James, 1970 Rhee and Amundson, 1982 Frenz and Horvath, 1985), enhanced oil recovery (Welge, 1952 Helfferich, 1981 Hirasaki, 1981 Orr and Taber, 1984 Lake, 1989), leach mining (Walsh et al., 1984), transport with precipitation and dissolution (Bryant et al., 1986, 1987 Novak et al., 1988 Helfferich, 1989a), sedimentation (Kynch, 1952 Wallis G, 1969), travel of disturbances through chemical equipment that is otherwise at equilibrium or steady state (Hwang and Helfferich, 1989), and traffic flow (Whitham, 1974 Tondeur, 1987a). If the species involved affect one another’s behavior, as is usually the case, the waves are nonlinear (that is, obey nonlinear differential equations). For such a purpose, a wave is defined as a variation of the values of dependent variables, usually concentrations, temperature, pressure, etc. Convective transport phenomena can be viewed as propagation of waves.
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