Journal ArticleDOI
Obstruction of pipelines due to paraffin deposition during the flow of crude oils
TLDR
In this article, a simple theory that gives the thickness of deposited layer as a function of axial position and time is presented, and experiments were carried out in order to validate the theoretical model.About:
This article is published in International Journal of Heat and Mass Transfer.The article was published on 1997-11-01. It has received 81 citations till now. The article focuses on the topics: Volumetric flow rate.read more
Citations
More filters
Journal ArticleDOI
Formation and Aging of Incipient Thin Film Wax-Oil Gels
TL;DR: A fundamental study of the deposition and aging of a thin incipient wax-oil gel that is formed during the flow of waxy oils in cooled pipes was performed in this article.
Journal ArticleDOI
Morphological evolution of thick wax deposits during aging
TL;DR: In this article, a mathematical model was proposed to predict the radial variation of the morphology of the wax deposit observed in the laboratory flow loop experiments along with the deposit thickness as a function of time.
Journal ArticleDOI
A Critical Review of the Modeling of Wax Deposition Mechanisms
TL;DR: A critical review of the research effort devoted to the understanding and modeling of the basic deposition mechanisms that control the wax deposition processes is presented in this paper, where molecular diffusion of paraffin has been identified as the dominant deposition mechanism.
Journal ArticleDOI
Prediction of the wax content of the incipient wax-oil gel in a pipeline: An application of the controlled-stress rheometer
TL;DR: In this article, a model system of wax and oil was used to understand the gelation process of these mixtures and a significant depression in the gel point of a wax-oil sample was observed by either decreasing the cooling rate or increasing the steady shear stress.
Journal ArticleDOI
The Effect of Asphaltenes on the Gelation of Waxy Oils
Ramachandran Venkatesan,Jenny Ann Östlund,Hitesh Chawla,Piyarat Wattana,Magnus Nydén,H. Scott Fogler +5 more
TL;DR: In this article, a controlled stress rheometer was used to study the gelation temperature and the yield stress of a model paraffin−oil system, and it was observed that the addition of asphaltenes in small proportions (∼0.1 wt %) resulted in a significant decrease both in the temperature and yield stress.
References
More filters
Journal ArticleDOI
Describing the Uncertainties in Experimental Results
TL;DR: The material presented in this paper covers the method of describing the uncertainties in an engineering experiment and the necessary background material, as well as a technique for numerically executing uncertainty analyses when computerized data interpretation is involved.
Handbook of heat transfer
TL;DR: In this article, the analogy between heat and mass transfer is covered and applied in the analysis of heat transfer by conduction, convection and radiation, and the analysis is performed by using the handbook of numerical heat transfer.
Journal ArticleDOI
Studies of Wax Deposition in the Trans Alaska Pipeline
TL;DR: In this paper, the authors investigated mechanisms of wax deposition and determined the expected nature and thickness of deposits in the pipeline as a function of time and distance, and found that deposition during start-up is a consequence of three separate mechanisms which transport both dissolved and precipitated waxy residue laterally.
Journal ArticleDOI
Note: NMR imaging of shear‐induced diffusion and structure in concentrated suspensions undergoing Couette flow
TL;DR: In this article, the authors describe NMR imaging of two concentrated suspensions undergoing flow between rotating concentric cylinders (wide gap, annular Couette flow) and find that particles migrate from the higher shear rate regions near the rotating inner cylinder to the lower shear rates near the stationary outer wall, establishing large concentration gradients after only a short time.
Proceedings ArticleDOI
Measurement and Prediction of the Kinetics of Paraffin Deposition
TL;DR: In this article, an experimental technique was used to measure paraffin deposition rates under flowing conditions at simulated operating conditions. And the deposition data were used as input to a deposition model that is used to predict deposition rates and the long-term effects of deposition.