CAJ | 학술논문

建立了电场作用下裂缝介质单相流体渗流的数学模型,设计了3个不同张开度的裂缝介质模型,采用有限元方法,通过数值模拟研究了电场强度、压力梯度及裂缝张开度对渗流速度的影响.结果表明:(1) 在一定条件下电场能有效地提高裂缝介质的渗流速度,电场强度越大,裂缝介质中渗流速度越大,在张开度为5×10~(-5)m的裂缝介质中,电场强度为450 V/m时,渗流速度可提高8.2倍;(2) 有、无电场作用时渗流速度之比随压力梯度增大呈指数衰减规律变化,压力梯度越小,电场对裂缝介质的渗流速度影响越大;(3) 在张开度小、渗透率低的裂缝介质中,电场对渗流速度的影响大.
건립료전장작용하렬봉개질단상류체삼류적수학모형,설계료3개불동장개도적렬봉개질모형,채용유한원방법,통과수치모의연구료전장강도、압력제도급렬봉장개도대삼류속도적영향.결과표명:(1) 재일정조건하전장능유효지제고렬봉개질적삼류속도,전장강도월대,렬봉개질중삼류속도월대,재장개도위5×10~(-5)m적렬봉개질중,전장강도위450 V/m시,삼류속도가제고8.2배;(2) 유、무전장작용시삼류속도지비수압력제도증대정지수쇠감규률변화,압력제도월소,전장대렬봉개질적삼류속도영향월대;(3) 재장개도소、삼투솔저적렬봉개질중,전장대삼류속도적영향대.
The single-phase flow through porous media in fracture media under electric field is studied with numerical simulation.A mathematical model describing the flow of single-phase fluid in fracture media under electric field is established based on the equivalent continuum model and the electroosmosis theory,the finite element method for solving the mathematical equations is introduced,three kinds of fracture media models with different fracture apertures are designed,and the effect of electric-field strength,pressure gradient and fracture aperture on flow velocity in fracture media is analyzed respectively in terms of the numerical results.The flow rate can be increased effectively under electric-field,for example,the velocity can be increased by 8.2 times in the fracture media whose aperture is 5×10~(-5) m when electric-field strength is 450 v/m,and the ratio of flow velocity under different electrical fields and zero electrical field decays exponentially with pressure gradient increasing.The results indicate that influence of electric field on flow through porous media is more significant with the decreasing in the pressure gradient and the fracture aperture.