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Geometric parameters of the six microsphere sensor models used in simulations. The sensor names in the simulations are D100S100, D60S100, D20S100, D60S60, D20S60, and D20S20, where the values following the D and S correspond to the diameter and the center-to-center spacing between two adjacent spheres for each case given below, respectively.
| D (μm) | S (μm) | Packing efficiency |
|---|---|---|
| 100 | 100 | 74.05% |
| 60 | 100 | 15.99% |
| 20 | 100 | 0.59% |
| 60 | 60 | 74.05% |
| 20 | 60 | 2.74% |
| 20 | 20 | 74.05% |
