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Flows in the split-bottom geometry. (A) Schematic of the split-bottom geometry. The blue inner section is fixed, while the gray outer section rotates. The side walls and bottom are rough, whereas the top is open. (B and C) Theoretical flow profiles in the r-z plane for (B) H = 10 mm and (C) H = 30 mm with Rs = 85 mm and d = 0.35 mm. (D) Comparison of surface flows to experimental data (4) for H = 10, 20, and 30 mm.
