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
FP-YOLOv8: Surface Defect Detection Algorithm for Brake Pipe Ends Based on Improved YOLOv8n.
Sensors (Basel)
December 2024
School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450000, China.
To address the limitations of existing deep learning-based algorithms in detecting surface defects on brake pipe ends, a novel lightweight detection algorithm, FP-YOLOv8, is proposed. This algorithm is developed based on the YOLOv8n framework with the aim of improving accuracy and model lightweight design. First, the C2f_GhostV2 module has been designed to replace the original C2f module.
View Article and Find Full Text PDFSoft, Modular Power for Composing Robots with Embodied Energy.
Adv Mater
January 2025
Department of Mechanical and Aerospace Engineering, Cornell University, 124 Hoy Road, Ithaca, NY, 14850, USA.
The adaptable, modular structure of muscles, combined with their confluent energy storage allows for numerous architectures found in nature: trunks, tongues, and tentacles to name some more complex ones. To provide an artificial analog to this biological soft muscle, a self-powered, soft hydrostat actuator is presented. As an example of how to use these modules, a worm robot is assembled where the near totality of the body stores electrochemical potential.
View Article and Find Full Text PDF[genus]_[species]; Presenting phylogenies to facilitate synthesis.
Cladistics
December 2024
Entomologie, Staatliches Museum für Naturkunde Stuttgart, Rosenstein 1, Stuttgart, 70191, Germany.
Each published phylogeny is a potential contribution to the synthesis of the Tree of Life and countless downstream projects. Steps are needed for fully synthesizable science, but only a minority of studies achieve these. We here review the range of phylogenetic presentation and note aspects that hinder further analysis.
View Article and Find Full Text PDFExperimental Study of Sinkhole Propagation Induced by a Leaking Pipe Using Fibre Bragg Grating Sensors.
Sensors (Basel)
September 2024
Department of Electrical and Electronic Engineering Science, University of Johannesburg, Johannesburg P.O. Box 524, South Africa.
Sinkhole formation caused by leaking pipes in karst soluble rocks is a significant concern, leading to infrastructure damage and safety risks. In this paper, an experiment was conducted to investigate sinkhole formation in dense sand induced by a leaking pipe. Fibre Bragg grating (FBG) sensors were used to record the strain.
View Article and Find Full Text PDFStudy on the integrated self-priming process of a vehicle-mounted self-priming pump.
Heliyon
September 2024
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310023, China.
Article Synopsis
- This study developed a comprehensive 3D circulatory system to investigate the self-priming characteristics of a self-priming pump on a mobile pump truck, incorporating key components like a tank and valves.
- User Defined Functions (UDF) were utilized to simulate the impeller's acceleration and constant speed operation, offering insight into the realistic changes in rotational speed during the pump's operation.
- The self-priming process was categorized into four stages, with each stage contributing increasingly to the total self-priming time, highlighting patterns like fluctuating water levels in the inlet pipe and energy losses in specific regions of the pump.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!