Based on the basic equations of simultaneous soil water and heat transfer during soil freezing, the coupled equation of moisture and heat is deduced.
利用土壤水分迁移方程和热传导方程，采用中心差分格式并在一定假设前提下建立起冻土水热耦合迁移数学模型。
Heat transfer equation is a kind of basic mathematical-physical equation. The thermal diffusivity is an important thermal physical parameter for soil.
传热方程是一类常见的基本数学物理方程，热导率是土体重要的热物理参数。
In accordance with the basic thermodynamic principles, the authors arrive at easily the stability criteria of difference equation in 3d heat transfer.
根据热力学基本原理，方便地确定出三维传热有限差分方程稳定性判据。此稳定性判据可用于求解具体的传热问题。
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