Show simple item record Wang, KM Lorente, S Bejan, A 2011-04-15T16:46:41Z 2010-03-15
dc.identifier.citation Journal of Applied Physics, 2010, 107 (4)
dc.identifier.issn 0021-8979
dc.description.abstract When solid material is removed in order to create flow channels in a load carrying structure, the strength of the structure decreases. On the other hand, a structure with channels is lighter and easier to transport as part of a vehicle. Here, we show that this trade off can be used for benefit, to design a vascular mechanical structure. When the total amount of solid is fixed and the sizes, shapes, and positions of the channels can vary, it is possible to morph the flow architecture such that it endows the mechanical structure with maximum strength. The result is a multifunctional structure that offers not only mechanical strength but also new capabilities necessary for volumetric functionalities such as self-healing and self-cooling. We illustrate the generation of such designs for strength and fluid flow for several classes of vasculatures: parallel channels, trees with one, two, and three bifurcation levels. The flow regime in every channel is laminar and fully developed. In each case, we found that it is possible to select not only the channel dimensions but also their positions such that the entire structure offers more strength and less flow resistance when the total volume (or weight) and the total channel volume are fixed. We show that the minimized peak stress is smaller when the channel volume (φ) is smaller and the vasculature is more complex, i.e., with more levels of bifurcation. Diminishing returns are reached in both directions, decreasing φ and increasing complexity. For example, when φ=0.02 the minimized peak stress of a design with one bifurcation level is only 0.2% greater than the peak stress in the optimized vascular design with two levels of bifurcation. © 2010 American Institute of Physics.
dc.language.iso en_US en_US
dc.relation.ispartof Journal of Applied Physics
dc.relation.isversionof 10.1063/1.3294697
dc.title Vascular structures for volumetric cooling and mechanical strength
dc.type Journal Article
dc.description.version Version of Record en_US 2010-2-15 en_US
duke.description.endpage 44901 en_US
duke.description.issue 4 en_US
duke.description.startpage 44901 en_US
duke.description.volume 107 en_US
dc.relation.journal Journal of Applied Physics en_US
pubs.issue 4
pubs.organisational-group /Duke
pubs.organisational-group /Duke/Pratt School of Engineering
pubs.organisational-group /Duke/Pratt School of Engineering/Mechanical Engineering and Materials Science
pubs.publication-status Published
pubs.volume 107

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