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蜡分子扩散过程是在热和质的广义热力学“力”耦合驱动下产生广义热力学“流”的结果,其实质是传热和传质同时存在的复杂耦合不可逆过程.基于非平衡态热力学的基本原理,推导出含蜡原油管输过程蜡分子扩散热质传递的线性唯象方程组;依据质量和能量的守恒关系,得到蜡分子扩散的传热一传质微分方程组,利用拉普拉斯变换求解到其解析解,探讨促使蜡分子扩散的动力学原因,分析输量和季节变化的不同工况对扩散速率的影响.
The molecular diffusion process of wax is the result of generalized thermodynamics “flow ” driven by the coupling of heat and mass in the generalized thermodynamics “force ”. The essence is the complex coupled irreversible process in which heat and mass transfer coexist. Based on the basic principle of thermodynamics, the paper deduces the linear phenomenological equations of the heat and mass transfer of wax molecules during the process of waxy crude oil pipeline transportation. Based on the conservation of mass and energy, the heat and mass transfer differential equations of wax molecular diffusion are obtained. Laplace transform to its analytical solution to explore the kinetic causes of the proliferation of wax molecules to analyze the influence of different conditions on the diffusion rate of the flux and seasonal changes.