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(A) Design of the microfluidic device. The lengths of the ordered medium l and the pore radius r are indicated. (B) Experimental results for Ca = 7.5 × 10−6 and 1.4 × 10−5 for a uniform porous medium with λ = 0 and a nonuniform medium with λ = −6.1 × 10−3. The invading fluid is water with red dye, and the displaced fluid is transparent silicone oil; the flow is from the bottom to the top.
