Effect of mechanical stirring on the tubular heating process of crude oil

Zhao, Jian; Li, Mingyu; Jiang, Minghu; Li, Yanpeng; Dong, Hang

doi:10.1016/j.ijheatmasstransfer.2023.124213

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…In addition, colloids and asphaltenes increase the adhesion of the particles. Therefore, in addition to considering liquid flow field and particle simulation (eqs –), during the DEM simulation, the JKR model (eq ) was used to calculate the contact force and other parameters of wax crystals. ∂ ( ε ρ ) ∂ t + ∇ · ( ρ ε u ) = 0 ∂ ( ε ρ u ) ∂ t + ∇ · ( ρ ε uu ) = prefix− ∇ p + ∇ · ( ε μ ∇ u ) + ρ ε bold-italicg − 1 V ∑ i = 1 n F D m d 2 bold-italicx normald t 2 = prefix∑ bold-italicF normald ( I · ω ) normald t = ∑ j M ij + M i , f …”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

“…In addition, colloids and asphaltenes increase the adhesion of the particles. Therefore, in addition to considering liquid flow field and particle simulation ( eqs 4 – 7 ), 83 during the DEM simulation, the JKR model 84 ( eq 8 ) was used to calculate the contact force and other parameters of wax crystals. …”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

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Dynamic Behavior Analysis of Wax Crystals during Crude Oil Gelation

Dong

Zhao

et al. 2023

ACS Omega

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The motion behaviors, rheological properties, and mechanical properties of a wax crystal mesoscale force chain network of waxy crude oil during gelation were experimentally studied and simulated by rheo-optic in situ measurement and computational fluid dynamics–discrete element method (CFD–DEM) numerical simulation, respectively. The motion behavior characteristics of wax crystals and the changes in the average coordination number of wax crystal networks were obtained at different temperatures. The study investigates the rule of crude oil rheological deterioration, the increase of wax crystals, and the changes in wax crystal motion behaviors with decreasing temperature. The relationship between the structure of the mesoscale force chain of the wax crystal network and the motion behaviors of the wax crystal and its rheological properties was analyzed. The results show that the average motion velocity of wax crystals or aggregates decreases from 28.48 to 22.56 μm/s when the temperature decreases from wax appearance temperature (48 °C) to 25 °C. The rotation and rolling trend of wax crystals gradually flatten, and the average coordination number increases 4.39 times. The viscosity of waxy crude oil increases from 6.27 to 8369.7 mPa·s, and the average coordination number of wax crystals obtained by CFD–DEM also increases significantly, which confirms the experimental results. We also found that when the system tended to gelation, a complex and stable force chain network was formed between the wax crystals, with a force chain coverage of 87.93% and a significant increase in the pressure drop in the flow field, which is consistent with the variation pattern of the system viscosity. The micro–meso-dynamic behavior analysis of waxy crude oil combined with CFD–DEM coupling provides a new way to explore the rheological properties of waxy crude oil and the microscopic mechanism of its modification.

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Section: Numerical Simulation Methodsmentioning

confidence: 99%

Section: Numerical Simulation Methodsmentioning

confidence: 99%

Dynamic Behavior Analysis of Wax Crystals during Crude Oil Gelation

Dong

Zhao

et al. 2023

ACS Omega

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Flow coupling analysis and evaluation of different working conditions for crude oil storage tanks under dynamic heating

Li,

Liang,

Chen

et al. 2024

Can J Chem Eng

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During periods of sharp demand increase, there is a need for significant expansion in the fundamental requirements for crude oil storage. As demand rapidly escalates, the prerequisites for crude oil storage necessitate substantial expansion. To scientifically and effectively reduce energy waste associated with heating oil, it is essential to study the heating methods and efficiency of crude oil storage tanks. Considering environmental temperature, solar radiation, and the physical properties of the oil, we have proposed a new heating model to elucidate the dynamic heating process of large floating roof storage tanks equipped with coils. Computational fluid dynamics (CFD) software was used to analyze the impact of the dynamic heating model on the temperature and velocity fields within the floating roof tank, taking into account different initial oil temperatures, oil levels, wind speeds, and types of crude oil during the winter heating process. Additionally, the research suggests the optimal maintenance heating temperature and duration for crude oil storage tanks during the winter season, introducing heating efficiency and inhomogeneity of temperature field as two evaluation metrics to compare the advantages of the dynamic heating method over traditional heating methods. This study provides fresh insights into the coil heating domain in crude oil storage tanks.

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