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Articolul urmator |
329 6 |
Ultima descărcare din IBN: 2024-03-08 09:45 |
Căutarea după subiecte similare conform CZU |
536.2.02 (2) |
Heat conduction. Heat transfer (40) |
SM ISO690:2012 МИЗОНОВ, Вадим, ТИХОНОВ, Андрей, БАСОВА, Елена, МИТРОФАНОВ, Андрей. Моделирование теплопроводности в среде с фазовым переходом с подвижной границей раздела фаз. In: Problemele Energeticii Regionale, 2021, nr. 3(51), pp. 53-61. ISSN 1857-0070. DOI: https://doi.org/10.52254/1857-0070.2021.3-51.05 |
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Problemele Energeticii Regionale | ||||||
Numărul 3(51) / 2021 / ISSN 1857-0070 | ||||||
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DOI:https://doi.org/10.52254/1857-0070.2021.3-51.05 | ||||||
CZU: 536.2.02 | ||||||
Pag. 53-61 | ||||||
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This work is devoted to the theoretical study of the effect of the phase interface motion on thermal conductivity in a liquid-solid nonlinear medium with a phase transition. The problem under consideration deals with the Stefan problems. Its most significant feature is the jump in the phase properties at separation of their moving boundaries. The objective was achieved by solving the following tasks: the construction of the process mathematical model based on its cell representation and with the use of the Markov chain theory mathematical apparatus, performing numerical experiments with the developed model, demonstrating its operability and the possibility to achieve the set goal. The most significant scientific results were as follows. First was an algorithm for the construction of a cell mathematical model of nonlinear thermal conductivity in a phase transitions medium with a moving phase interface for domains of a canonical shape (plane wall, cylinder, ball). Second, the results of the numerical experiments, showing that the jump of properties affected greatly the kinetics of the process. The significance of the results obtained consisted in the development of a simple but informative mathematical model of the media heat treatment kinetics with phase transformations, available for a direct use in the engineering practice. The proposed algorithm for constructing the model can be effectively used in prediction the open water pipes freezing in cold regions, in modeling the heat treatment of metals, in choosing the freezing modes of food products for a long-term storage, and other thermo-physical processes. |
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Cuvinte-cheie nonlinear thermal conductivity, phase transition, phase interface, thermo-physical properties of phases, cell model, state vector, thermal conductivity matrix, numerical experiment, conductivitate termică neliniară, tranziție de fază, limită fazei, proprietăți termofizice ale fazelor, model de celule, vector de stare, matrice de conductivitate termică, experiment numeric, нелинейная теплопроводность, фазовый переход, граница раздела фаз, теплофизические свойства фаз, ячеечная модель, вектор состояния, матрица теплопроводности, численный эксперимент |
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