Growth and aggregation micromorphology of natural gas hydrate particles near gas-liquid interface un

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To investigate the morphological evolution of the whole growth and aggregation processes of hydrate crystals near the gas-liquid interface,we used a high-pressure visual reactor with high-speed camera to capture the micromorphology of hydrate particles in a natural gas + pure water system with pressure from 2.6 to 3.6 MPa and sub-cooling from 4.7 to 6.23 ℃.The results showed that under low sub-cooling conditions,the amount and size of particles increased first and then decreased in the range of 0-330 μm,and the small particles always dominated.These particles can be roughly classified into two categories:planar flake particles and polyhedral solid particles.Then,the concept of maximum growth dominant particle size was proposed to distinguish the morphological boundary of growth and aggregation.In addi-tion,the micro model was established to better reflect the effects of particle formation process and evo-lution mechanism near the gas-liquid interface under stirring condition.The results of this study can provide a guidance for flow assurance in multiphase pipeline.
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