Research on the Flow Characteristics of Micro-bubbles in a Simulated Pore Throat Channel

doi:10.11885/j.issn.1674-5086.2020.09.21.04

Abstract

Abstract: In order to study the percolation characteristics of microbubbles in porous media, a microfluidic chip integrated with T micro channel and reducing channel was designed. Flow characteristics of microbubbles formed by "deionized water + air" and "0.02% Tween 20 solution + air" were studied by microfluidic system based on micro imaging. The fluid velocity and pressure changes in the microchannel during bubble fusion were analyzed by CFD method. Experimental results show that when the liquid phase is deionized water, with the change of gas pressure and liquid velocity, the microbubbles will fuse and not fuse when they flow through the reducing channel. The microbubbles generated by "0.02% Tween 20 solution + air" will pass through the reducing channel in turn and will not fuse. When the microbubbles are fused, the surface tension causes the microbubbles to deform, which leads to the large fluctuation of the surrounding fluid velocity, forming velocity "eddy current". When entering the "throat" again, the pressure in the "pore" increases. The experimental study is helpful to further understand the percolation characteristics and displacement mechanism of micro foam flooding.

Key words: microfluidic, microbubble, reducing channel, pore throat configuration, flow characteristics

CLC Number:

TE357

WU Binbin, WANG Chengsheng, CHEN Ping, HUANG Bo, TANG Engao. Research on the Flow Characteristics of Micro-bubbles in a Simulated Pore Throat Channel[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(6): 87-96.

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