A multicomponent model is developed for wax deposition onto a cold finger from a stirred wax-containing oil. It utilizes Coutinho's thermodynamic equations for wax component concentrations and energy and mass transport equations within the deposit and from the oil and is the first cold-finger model to predict both deposit thickness growth and aging by selective precipitation of heavier wax components. While it captures well deposit thickness growth, it requires preventing re-dissolution of deposited wax to avoid shrinkage not observed in experiments. The model predicts deposit aging reasonably well but with quantitative deviations for the heavier wax of up to a factor of two. Possible explanations include the inadequacy of Hayduk-Minhas and Cussler's hindered-diffusion models to the soluble multicomponent wax diffusivities. Using pseudo two- and one-component representation can reasonably predict the deposit thickness and aging of multi-component deposits. This work shows an improved approach to modeling wax deposition and aging.

中文翻译：

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对冷表面上的多组分蜡沉积和老化进行建模并应用于管道污垢

开发了一种多组分模型，用于将搅拌的含蜡油中的蜡沉积到指形冷冻器上。它利用 Coutinho 的热力学方程来计算沉积物内和石油中的蜡成分浓度以及能量和质量传输方程，并且是第一个通过较重蜡成分的选择性沉淀来预测沉积物厚度增长和老化的冷手指模型。虽然它捕获了沉积物厚度的增长，但它需要防止沉积蜡的重新溶解，以避免实验中未观察到的收缩。该模型对沉积物老化的预测相当不错，但对于较重的蜡，定量偏差高达两倍。可能的解释包括 Hayduk-Minhas 和 Cussler 的受阻扩散模型对于可溶性多组分蜡扩散率的不足。使用伪二组分和一组分表示可以合理地预测多组分沉积物的沉积厚度和老化。这项工作展示了一种改进的蜡沉积和老化建模方法。