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abstract: In mathematics and its applications, particularly to phase transitions in matter, a Stefan problem (also Stefan task) is a particular kind of boundary value problem for a partial differential equation (PDE), adapted to the case in which a phase boundary can move with time. The classical Stefan problem aims to describe the temperature distribution in a homogeneous medium undergoing a phase change, for example ice passing to water: this is accomplished by solving the heat equation imposing the initial temperature distribution on the whole medium, and a particular boundary condition, the Stefan condition, on the evolving boundary between its two phases.

以上来源于: WordNet

Stefan problem is free boundary condition of physical equation in thermal transfer when the boundary change.

斯蒂芬问题是研究边界变化时导热规律的的物理方程的自由边界条件。

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Stefan problem of ice-water mixture is discussed under the condition of the second boundary and heat source accelerating to melt ice.

讨论在第二边界条件和有热源加速冰融化情况下冰水混合物自由边界问题。

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"I feel the same problem exists when the neighbors and the people find out what we're doing, " Stefan said.

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