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Experimental study of the effect of Hartmann-Sprenger resonance tube end flow on tube heating performance | ||
| مکانیک سیالات و آیرودینامیک | ||
| Article 8, Volume 13, Issue 2 - Serial Number 33, November 2024, Pages 99-111 PDF (1.63 M) | ||
| Document Type: Original Article | ||
| Authors | ||
| amirhamzeh farajollahi* 1; Mohsen Rostami2; Ehsan Dadkhah3; Mostafa mohammadalizadeh Gorji4 | ||
| 1Associate Professor, Imam Ali University (AS), Tehran, Iran | ||
| 2Assistant Professor, Imam Ali (AS) University, Tehran, Iran | ||
| 3Master's degree, Sharif University of Technology, Tehran, Iran | ||
| 4Master's degree, Imam Ali University, Tehran, Iran | ||
| Receive Date: 17 May 2024, Revise Date: 23 August 2024, Accept Date: 12 November 2024 | ||
| Abstract | ||
| In industrial processes, particularly in oil, gas, and fuel pipeline systems, erosion is a common issue. Small particles colliding with the surfaces of pipes lead to damage and erosion. Therefore, examining the motion of particles and determining influential parameters in the extent of damages resulting from particle impact on the inner walls of pipes is of great significance. The primary objective of this study is to investigate the movement of particles and estimate the extent of particle impact on the inner walls of U-shaped pipes, considering different inlet flow rates and various particle sizes to assess the vulnerability of pipe walls to particle impact in each geometry of U-shaped pipes. The geometry of the pipes has been reconstructed using design software. Subsequently, fluid flow modeling and tracking of microbubbles in each geometry of the pipes have been conducted using finite element analysis software. The results of the simulation for pipes with diameters of 3, 6, and 9 mm showed that the number of microbubbles hitting the inner wall of U-shaped tubes increases with the increase of the inner diameter of the tubes. In this study, three ratios of 2.33, 3.2, and 4.2 were assumed for the pipe curvature radius, and the results showed that in all pipes, decreasing the pipe curvature increases the number of microbubbles hitting the inner wall of the pipes. to be for example, in a pipe with a diameter of 3 mm and a fluid velocity of 12 meters per second, the difference in microbubble impact for different curvature radii is about 25%. The reason for this phenomenon is that the reduction of the curvature of the pipe causes the creation of a vortex after the fluid passes through the curved area. It turns out that this vortex can increase the possibility of bubbles hitting the wall. It can also be seen that between the input speeds of 1, 4, 8 and 12 meters per second, the maximum collision is for the input of 12 meters per second. It is concluded that increasing the speed of the incoming fluid flow causes an increase in the number of bubbles hitting the inner wall of the tubes due to the increase in the drag force (which is caused by the increase in the speed of the incoming fluid flow). The results also showed that by reducing the diameter of microbubbles (1, 2, 3 and 4 microns), the amount of particles hitting the wall increases greatly, so that increasing the number of microbubbles hitting the wall can cause great damage to the body. This study can contribute significantly to understanding and improving the erosion phenomenon in pipeline systems, especially in industrial environments. Researchers and industry professionals, in designing and optimizing their pipeline systems, can benefit from the patterns and recommendations derived from this research, thereby enhancing the performance and resistance of their systems against erosion. | ||
| Keywords | ||
| Tube; Microbubble; Collision of particles; Erosion | ||
| References | ||
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