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Dynamic boundary conditions in the interface modeling of binary alloys. (English) Zbl 1431.35195

Summary: We study the initial boundary value problem with dynamic boundary conditions to the Penrose-Fife equations with a ‘memory effect’ for the order parameter and temperature time evolutions. The dynamic boundary conditions describe the process of production and degradation of surface crystallite near the walls, which confine the disordered binary alloy at a nearly melt temperature during the fast cooling process. The solid-liquid periodic distributions, which were obtained in 1D case, represent asymptotically periodic piecewise constant spatial-temporal impulses in a long timedynamics. It is confirmed that, depending on parameter values, the total number of discontinuity points of such periodic impulses can be finite or infinite. We refer to such wave solution types as relaxation or pre-turbulent, respectively. These results are compared with experimental data.

MSC:

35Q70 PDEs in connection with mechanics of particles and systems of particles
35B10 Periodic solutions to PDEs
80A22 Stefan problems, phase changes, etc.
35B40 Asymptotic behavior of solutions to PDEs
80A19 Diffusive and convective heat and mass transfer, heat flow
35C07 Traveling wave solutions
82C26 Dynamic and nonequilibrium phase transitions (general) in statistical mechanics
35L20 Initial-boundary value problems for second-order hyperbolic equations
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