静电场条件下环戊烷水合物在多孔介质中的相变可视化研究

Visualization of cyclopentane hydrate phase transition in porous media under electrostatic field

摘要

通过微流控芯片模拟地层中多孔介质,进行环戊烷水合物的相变试验。通过显微观察,分析同一过冷度下外加静电场对水合物形态、生长速率、诱导时间及相平衡温度的影响。结果表明:静电场能够改变环戊烷水合物晶体的生长形态、显著缩短诱导时间,但轻微降低相平衡温度;随着电场强度的增大,水合物诱导时间延长、相平衡温度升高;静电场作用下环戊烷水合物的生长速率明显提高。

Abstract

The phase transition experiments were conducted on cyclopentane hydrates through the emulation of subsurface porous media via a microfluidic chip by means of microscopic observation, the influence of an applied electrostatic field under identical subcooling conditions on hydrate morphology, growth rate, induction time, and equilibrium temperature were analyzed. The results show that the electrostatic field has the ability to alter the growth morphology of CP hydrate crystals and significantly shorten the induction time, but slightly reduce the phase equilibrium temperature. With the increase of electric field intensity, the hydrate induction time is prolonged and the phase equilibrium temperature is increased. Under the influence of an electrostatic field, the growth rate of CP hydrates exhibits a noticeable enhancement.

关键词

环戊烷水合物 / 相变 / 静电场 / 微流控

Key words

cyclopentane hydrate / phase transition / electrostatic field / microfluidics

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基金资助

国家自然科学基金项目(51874343)