Wax deposit inside pipelines continues to be a critical issue in the oil and gas industry. The available wax deposition data in the literature are currently insufficient to construct viable predictive numerical methods that capture all wax deposit features. Therefore, more research studies are required to improve our understanding of the physics of wax-deposition phenomena. In the present paper, a numerical study is performed to predict the temporal and spatial distribution of the porous wax deposit during laminar flow in a pipe. A mathematical model which combines the energy and momentum balance equations and molecular diffusion model by Fick's law is employed to better describe the wax deposit. Validation with experimental data as well as numerical results and characteristics of wax deposition are presented. The results revealed that an increase in the deposition time and porosity leads to a significant increase in the wax deposit content and pressure drop, and a decrease in the fluid temperature, heat transfer coefficient, and flow rate. However, an increase in porosity leads to larger variation of these parameters over a short period of time. Further, it is demonstrated that the wax deposit is concentrated over a short axial length, and its maximum which appears at X/L = 0.014 is kept unchanged with time and porosity variation.

管道内的蜡沉积仍然是石油和天然气行业的一个关键问题。文献中可用的蜡沉积数据目前不足以构建可捕获所有蜡沉积特征的可行预测数值方法。因此，需要更多的研究来提高我们对蜡沉积现象物理学的理解。在本文中，进行了一项数值研究，以预测管道中层流过程中多孔蜡沉积物的时空分布。采用结合能量和动量平衡方程和菲克定律的分子扩散模型的数学模型来更好地描述蜡沉积。给出了实验数据的验证以及蜡沉积的数值结果和特征。结果表明，沉积时间和孔隙率的增加导致蜡沉积物含量和压降显着增加，流体温度、传热系数和流速降低。然而，孔隙率的增加会导致这些参数在短时间内发生较大的变化。此外，表明蜡沉积物集中在较短的轴向长度上，并且出现在 X/L = 0.014 处的最大值随着时间和孔隙度的变化而保持不变。