Symmetry is not always prefect

This paper discusses the effect of bifurcation structures on flow resistance of the two-bifurcation network, which satisfies Murray's law. The asymmetrical and symmetrical two-bifurcation networks with the same number and diameter of the terminal branches are compared, and the results show that the symmetrical two-bifurcation network is not the best for transport in it. (C) 2010 Elsevier Ltd. All rights reserved.