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Schematic of a self-similar fractal tree-like microchannel network with branching number N = 2 and total number of branching levels m = 2. lk (k = 0, 1, 2) is the length of the microchannel at the kth level and dk (k = 0, 1, 2) is the hydraulic diameter of the microchannel at the kth level.
