Study on the Influence of Spiral Guide Vane Height on Liquid-Solid Flow Characteristics

Abstract

Water-bearing natural gas readily forms hydrates in low-temperature, high-pressure environments such as deep-sea settings. In severe cases, these hydrates can clog pipelines, leading to safety incidents. Therefore, ensuring flow safety and improving safety boundaries are important issues to be addressed. This article is based on the principle of improving solid carrying capacity through spiral tube flow, and conducts numerical simulation research on the two-phase spiral flow of natural gas hydrate gas solid starting from the entire length of the guide strip. Defined the swirl intensity generated by the pressure loss per unit pipe length as the pipeline swirl efficiency evaluation parameter ξ. The DPM model and RNG k-epsilon model were used to study the effect of guide strip height on swirl intensity, turbulence energy distribution, particle behavior. And pressure loss characteristics. The results indicate that the swirl intensity gradually increases with increasing radial distance, reaching a maximum value between 0.4D-0.45D and then decreasing slightly. As the height of the deflector increases, the radial average swirl intensity increases, the tangential velocity increases, the turbulence energy increases, and the pressure loss also significantly increases; As the height of the deflector increases. The curve of the energy efficiency parameter ξ shows a parabolic pattern of first increasing and then decreasing. When the deflector height h equals D/6.the energy efficiency parameter ξ reaches its maximum v