Abstract Compared with traditional fossil fuels, gas hydrates have vast reserves, cause little pollution, and are an essential strategic energy resource. Pipeline transportation is critical to realize the development and utilization of natural gas hydrate resources. The Eulerian multiphase flow model within the computational fluid dynamics software FLUENT was employed to calculate gas–liquid–solid flow, taking into account phase interactions, heat transfer, and collision among particles. Pipeline transportation of gas hydrate-bearing sediment (GHBS) particles was studied based on dimensional analysis and numerical simulation. First, the essential dimensionless numbers controlling multiphase flow and hydrate dissociation were deduced. Further, the obtained simulation results clearly indicate that when the system was in a stable state, there was a dissociation equilibrium height above which hydrate dissociated completely. The influences of the dimensionless numbers on the dissociation equilibrium height and friction coefficient in the pipe were determined, and power-law correlations for the dissociation equilibrium height and friction coefficient were obtained from the numerical data. Finally, an analytical expression of dissociation equilibrium height was derived by decoupling the solid–liquid flow and gas hydrate dissociation, and the validity of the power-law correlation for the dissociation equilibrium height was verified by the analytical expression.

中文翻译：

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含天然气水合物沉积物颗粒管道输送的解离平衡高度和摩擦系数

摘要 与传统化石燃料相比，天然气水合物储量大、污染小，是必不可少的战略能源。管道运输是实现天然气水合物资源开发利用的关键。计算流体动力学软件 FLUENT 中的欧拉多相流模型用于计算气-液-固流动，同时考虑颗粒之间的相相互作用、传热和碰撞。基于量纲分析和数值模拟，研究了含天然气水合物沉积物（GHBS）颗粒的管道输送。首先，推导出控制多相流和水合物分解的基本无量纲数。此外，得到的仿真结果清楚地表明，当系统处于稳定状态时，存在一个解离平衡高度，高于该高度水合物完全解离。确定了无量纲数对管内解离平衡高度和摩擦系数的影响，并从数值数据中获得了解离平衡高度和摩擦系数的幂律关系。最后，通过解耦固液流动和气体水合物解离得到解离平衡高度的解析表达式，并通过解析表达式验证了解离平衡高度的幂律相关性的有效性。从数值数据中获得了解离平衡高度和摩擦系数的幂律相关性。最后，通过解耦固液流动和气体水合物解离得到解离平衡高度的解析表达式，并通过解析表达式验证了解离平衡高度的幂律相关性的有效性。从数值数据中获得了解离平衡高度和摩擦系数的幂律相关性。最后，通过解耦固液流动和气体水合物解离得到解离平衡高度的解析表达式，并通过解析表达式验证了解离平衡高度的幂律相关性的有效性。