Gel particle-containing discontinuous phase seepage experimental apparatus and critical pressure determination method

A gel particle-containing discontinuous phase seepage experimental apparatus, comprising a micro-liquid volume injection system, a pressure acquisition and transmission system, a microscopic observation system, and an in-microchannel particle screening and transfer system;

• the micro-liquid volume injection system being configured to inject different types of gel particle solutions;
• the pressure acquisition and transmission system being configured to monitor pressure fluctuation features of gel particles transferring in and blocking a microchannel;
• the microscopic observation system being configured to visually study a transfer state and a blockage mode of the gel particles in the microchannel;
• and the in-microchannel particle screening and transfer system being configured to accurately screen out target gel particles;
• wherein
• the in-microchannel particle screening and transfer system comprises single-channel microfluidic chips with different structures;
• the single-channel microfluidic chip comprises a gel particle injection port, a gel particle screening port, a waste liquid discharge port, an adjustable valve, a continuous phase injection port, a main transfer microchannel, an S-shaped channel, a convergence channel, a narrow throat, and a gel particle discharge port;
• the gel particle injection port and the waste liquid discharge port are located on the same straight line, and a channel where the gel particle screening port is located is perpendicular to a communication channel between the gel particle injection port and the waste liquid discharge port;
• the main transfer microchannel forms an included angle of 125°-150° with the communication channel between the gel particle injection port and the waste liquid discharge port, a channel where the continuous phase injection port is located is vertically communicated with a main channel, and the main transfer microchannel, the S-shaped channel, the convergent channel, the narrow throat, and the gel particle discharge port are communicated successively;
• and
• the adjustable valve is located at the leftmost end of the main transfer microchannel, and the communication between a screening channel and a transfer channel is controlled through the adjustable valve.