This paper presents the results of a modeling study for paraffin deposition under single-phase turbulent flow conditions. Analysis on flow loop deposition data is presented for various crude oils such as South Pelto crude oil, Garden Banks condensate and Trans Alaska Pipeline System (TAPS) crude oil. A new closure relationship simulating shear effects is proposed.
The experimental data were obtained under single-phase turbulent flow conditions using different types of crude oils on different test facilities at TUPDP (Tulsa University Paraffin Deposition Projects). These data were used to develop a correlation which can be used to predict the relative difference between the estimated wax mass deposition rate and mass diffusion rate from Fick's law as a function of the Nusselt and Sherwood numbers representing the heat and mass transfer characteristics under turbulent flow conditions. Uncertainty analysis was conducted on this correlation and most of the data points fall within the range of ±25%. Model predictions have been compared using a film mass transfer model and equilibrium model. It is observed that the film mass transfer model always over predicts the deposition rate. But the equilibrium model can both under predicts and over predicts the deposition rate. The results presented in this paper can be used to improve the accuracy of paraffin deposition model predictions under turbulent flow conditions.