Abstract
Based on the swirl flow of gas hydrate pipeline safety flow technology, the numerical simulation method is used to study the attenuation law of hydrate particles, which is of great significance for expanding the boundary of safe flow. The results show that the size of the initial swirl number is mainly related to the twist rate and has nothing to do with the Reynolds number; the smaller the twist rate, the greater the Reynolds number, the greater the number of swirling flow in the same position in the pipeline. The concentration has almost no effect on the change of the swirl number; for the non-dimensional swirl number, and the numerical simulation is roughly the same as the results of the paper, the attenuation coefficient beta and ln (Re) has a linear relationship. The no twist tape is six to eight times larger than the volume fraction of the twisted belt, and the smaller the twist tape twist, the smaller the particle deposition is, the higher the initial concentration of the particles in the pipe, and the larger the volume fraction of the hydrate particles deposited by the tube wall.
Highlights
In the 1930s, American scientist, Hammerschmidit [1], first discovered hydrates in pipelines, which confirmed that natural gas hydrates are the cause of blockage of pipelines and are getting more and more attention from the outside
The swirl number, S, is an important physical quantity characterizing the flow characteristics of the swirl flow, which can characterize the degree of swirling flow in the swirl flow, and is usually defined by the magnitude of the circumferential speed or the angular velocity of rotation
In the hydrate particle transport of the gas pipeline, the influence of the swirl flow on the hydrate particles is mainly determined by the magnitude of the swirling force compared with the non-swirl flow
Summary
In the 1930s, American scientist, Hammerschmidit [1], first discovered hydrates in pipelines, which confirmed that natural gas hydrates are the cause of blockage of pipelines and are getting more and more attention from the outside. Natural gas hydrates control technology mainly includes heating, pressurization, and adding chemical reagents [2]. The gas pipeline hydrates’ blockage prevents and controls changes of the traditional complete inhibition to the risk management, which ensures the safe flow in the gas pipeline [3,4,5,6,7]. The attenuation characteristics of swirl flow have gradually attracted research worker’s attention to engineering practice, such as the isolator, combustion chamber, and heat exchanger
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