Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
An experimental study on the flow behavior of crude oil containing sand and air in a vertical pipe with 50 mm diameter was carried out. The experiments were conducted under the following input superficial phase velocities: oil from 0.1 to 2.23 m/s and gas from 0 to 0.34 m/s. Oil was blended with sand in three different volume concentrations, namely, 0.7, 2, and 3%. Two different types of sand were used to investigate the effect of sand size distribution. A comparison between rheological measurements and pipe flow data showed that the stress-strain relationship obtained by the rheometer could be used to predict the transport characteristics in the vertical pipe flow. It was demonstrated that a small gas injection and sand addition can decrease the total pressure and friction pressure gradients. In the oil flow, the injection of air generally increased the friction factor compared to the single-phase flow, especially at low Reynolds numbers. However, the friction factor decreased by adding a small amount of fine sand. The accuracy of the correlation developed in this study was compared with other three correlations widely used in gas-liquid vertical pipe flow.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7726948 | PMC |
| http://dx.doi.org/10.1021/acsomega.0c04637 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Emerging contaminants in sludge treatment reed beds: Removal, persistence, or accumulation?
Water Res
August 2025
Department of Environmental Science, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark; WATEC - Centre for Water Technology, Aarhus University, Ny Munkegade 120, 8000 Aarhus, Denmark.
Sludge treatment reed beds (STRBs) are a sustainable and cost-effective approach to dewatering and mineralizing sewage sludge. While these nature-based solutions are robust and efficient in dewatering and stabilizing excess sludge, it is still unclear the fate of micropollutants in such technology and consequently, the quality of the final product biosolids that can be used as fertilizer, when legislation allows for it. The STRBs consisted of an area of 2.
View Article and Find Full Text PDFSimulation-based nuclear method for quality control of polyethylene pipes in production lines using GEANT4.
Appl Radiat Isot
August 2025
Faculty of Sciences and Modern Technologies, Graduate University of Advanced Technology, Kerman, Iran. Electronic address:
Defect detection during pipeline production is essential to enhance efficiency, improve product quality, and ensure safety. One of the primary challenges in polyethylene pipe manufacturing is distinguishing between intact and defective pipes during the production process. In this study, nuclear techniques were employed for defect detection in polyethylene pipes using the GEometry ANd Tracking (GEANT4) simulation tool.
View Article and Find Full Text PDFAn equivalent circulating density prediction model for extended-reach horizontal wells considering drill strings sinusoidal buckling.
Sci Rep
July 2025
SINOPEC Research Institute of Petroleum Engineering Co., Ltd, Beijing, 102206, China.
Sinusoidal buckling of drill strings will be easily caused during drilling process of extended-reach horizontal wells due to the factors such as excessive well length and larger friction torque, which will cause measurement errors of well depth and vertical depth and furthermore influence the accurate calculation of ECD. We have corrected the traditional ECD calculation model, considered the measurement errors of well depth and vertical depth caused by the sinusoidal buckling of drill strings, and established a set of equivalent circulating density (ECD) calculation model suitable for extended-reach horizontal wells to meet the requirements for fine ECD control during the drilling operation. We have combined the data from an extended-reach horizontal well in the East China Sea and compared the ECD data obtained from the recorded stand pipe pressure with the prediction results from Landmark commercial software、the model in this work and the conventional model.
View Article and Find Full Text PDFBioinspired untethered electromagnetic pipe-crawling robot.
Bioinspir Biomim
July 2025
Program in Nanoengineering and Nanoscience, Graduate School of Advanced Technology, National Taiwan University, Taipei 106319, Taiwan.
In pipe systems, the emergence of pipe-crawling robots (PCRs) has attracted significant attention for pipe inspection and repair applications. However, conventional PCRs are bulky and heavy, limiting their speed and adaptability, particularly in confined spaces. Additionally, their reliance on tethered power and signal transmission restricts mobility due to the constraints of external cables.
View Article and Find Full Text PDFPrediction and reliability analysis of rigid pipeline response in soft soil using improved particle swarm neural network.
Sci Rep
July 2025
College of Civil Engineering and Architecture, Wenzhou University, Wenzhou, 325035, China.
Pipelines in soft soil are prone to deformation and failure under traffic loads. Therefore, it is highly important to accurately characterize the dynamic response of pipelines under traffic loads and reasonably evaluate their operational status. First, for rigid pipelines, a Dload subroutine is written in the FORTRAN language to accurately characterize traffic loads, and a 3D numerical analysis model of the rigid pipe‒soil system is established using ABAQUS software to simulate the dynamic response of rigid pipelines in soft soil under traffic loads.
View Article and Find Full Text PDF