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| state s | time ratio p(s) | τ 1 (s) | τ 2 (s) |
| (1, 1) | f 1 f 2 |
|
|
| (1, 0) | f 1 (1−f 2) |
|
0 |
| (0, 1) | f 2 (1−f 1) | 0 |
|
| (0, 0) | (1−f 1) (1−f 2) | 0 | 0 |
The state 
denotes the open-close states of the two capillary groups, where 
when the 
-th capillary group is open and 
when it is closed. 
and 
are the wall shear stresses of the two capillary groups at state 
, respectively.
